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Samplers perform the actual work of JMeter. Each sampler except Flow Control Action generates one or more sample results. The following types of embedded resource are retrieved:. The default parser is org. This can be changed by using the property " htmlparser. This can save you time if you have a lot of HTTP requests or requests with many parameters. If the request requires server or proxy login authorization i. For normal logins i. A separate SSL context is used for each thread. If you want to use a single SSL context not the standard behaviour of browsers , set the JMeter property:. JMeter also allows one to enable additional protocols, by changing the property https. If the request uses a technique called "URL Rewriting" to maintain sessions, then see section 6. A Duration Assertion can be used to detect responses that take too long to complete. More methods can be pre-defined for the HttpClient4 by using the JMeter property httpsampler. Additionally, you can specify whether each parameter should be URL encoded. If you are not sure what this means, it is probably best to select it. If your values contain characters such as the following then encoding is usually required. This allows arbitrary bodies to be sent. See below for some further information on parameter handling. Parameter Handling: For the POST and PUT method, if there is no file to send, and the name s of the parameter s are omitted, then the body is created by concatenating all the value s of the parameters. Note that the values are concatenated without adding any end-of-line characters. The values are encoded if the encoding flag is set. For other methods, if the name of the parameter is missing, then the parameter is ignored. This allows the use of optional parameters defined by variables. You have the option to switch to Body Data tab when a request has only unnamed parameters or no parameters at all. This option is useful in the following cases amongst others :. To send a CRLF after the last line of data, just ensure that there is an empty line following it. This cannot be seen, except by noting whether the cursor can be placed on the subsequent line. If not using a file, attach a Header Manager to the sampler and define the Content-Type there. JMeter scan responses from embedded resources. For each id found, JMeter checks two further properties:. See jmeter. HttpClient4 and Java Sampler support emulation of slow connections; see the following entries in jmeter. Response size calculation The Java implementation does not include transport overhead such as chunk headers in the response body size. The HttpClient4 implementation does include the overhead in the response body size, so the value may be greater than the number of bytes in the response content. Retry handling By default retry has been set to 0 for both HttpClient4 and Java implementations, meaning no retry is attempted. For HttpClient4, the retry count can be overridden by setting the relevant JMeter property, for example: httpclient4. If you want to retry for all methods, then set property httpclient4. Note: Certificates does not conform to algorithm constraints You may encounter the following error: java. Remove the MD2 value or the constraint on size, depending on your case. See Bug for details. If the Variable Names list is provided, then for each row returned by a Select statement, the variables are set up with the value of the corresponding column if a variable name is provided , and the count of rows is also set up. For example, if the Select statement returns 2 rows of 3 columns, and the variable list is A,,C , then the following variables will be set up:. Old variables are cleared if necessary - e. This sampler lets you control a java class that implements the org. JavaSamplerClient interface. By writing your own implementation of this interface, you can use JMeter to harness multiple threads, input parameter control, and data collection. The pull-down menu provides the list of all such implementations found by JMeter in its classpath. The parameters can then be specified in the table below - as defined by your implementation. Two simple examples JavaTest and SleepTest are provided. The JavaTest example sampler can be useful for checking test plans, because it allows one to set values in almost all the fields. These can then be used by Assertions, etc. The fields allow variables to be used, so the values of these can readily be seen. The following parameters apply to the SleepTest and JavaTest implementations:. The following parameters apply additionally to the JavaTest implementation:. User has to enter all the attributes in the table. The entries are collected from the table to add. The execution time is calculated. The created entry will not be deleted after the test. And calculate the execution time. The entries are collected from the table to modify. This will create the entry first, then will search if the attributes are available. It calculates the execution time of the search query. This will search the user defined entry Search filter in the Search base again, defined by the user. For starting this session a thread bind is used, which is equal to the LDAP " bind " operation. The user is requested to give a username Distinguished name and password , which will be used to initiate a session. When no password, or the wrong password is specified, an anonymous session is started. Take care, omitting the password will not fail this test, a wrong password will. This is simply the operation to end a session. It is equal to the LDAP " unbind " operation. This is a combination of the LDAP " bind " and " unbind " operations. This is the LDAP " moddn " operation. It can be used to rename an entry, but also for moving an entry or a complete subtree to a different place in the LDAP tree. This is the LDAP " add " operation. It can be used to add any kind of object to the LDAP server. This is the LDAP " search " operation, and will be used for defining searches. This is the LDAP " modify " operation. It can be used to modify an object. It can be used to add, delete or replace values of an attribute. This is the LDAP " compare " operation. It can be used to compare the value of a given attribute with some already known value. In reality this is mostly used to check whether a given person is a member of some group. In such a case you can compare the DN of the user as a given value, with the values in the attribute " member " of an object of the type groupOfNames. If the compare operation fails, this test fails with errorcode AccessLogSampler was designed to read access logs and generate http requests. For those not familiar with the access log, it is the log the webserver maintains of every request it accepted. Tomcat uses the common format for access logs. This means any webserver that uses the common log format can use the AccessLogSampler. Common log format looks like this:. For the future, it might be nice to filter out entries that do not have a response code of Extending the sampler should be fairly simple. There are two interfaces you have to implement:. The servername, port and get images are set by AccessLogSampler. Next, the parser is called with integer 1 , telling it to parse one entry. Classes implementing Generator interface should provide concrete implementation for all the methods. The TCLogParser processes the access log independently for each thread. The SessionFilter is intended to handle Cookies across threads. It does not filter out any entries, but modifies the cookie manager so that the cookies for a given IP are processed by a single thread at a time. If two threads try to process samples from the same client IP address, then one will be forced to wait until the other has completed. The LogFilter is intended to allow access log entries to be filtered by filename and regex, as well as allowing for the replacement of file extensions. However, it is not currently possible to configure this via the GUI, so it cannot really be used. For full details on using BeanShell, please see the BeanShell website. The test element supports the ThreadListener and TestListener interface methods. These must be defined in the initialisation file. See the file BeanShellListeners. The BeanShell sampler also supports the Interruptible interface. The interrupt method can be defined in the script or the init file. If the property " beanshell. This can be used to define common methods and variables. There is a sample init file in the bin directory: BeanShellSampler. The contents of the Parameters field is put into the variable " Parameters ". The string is also split into separate tokens using a single space as the separator, and the resulting list is stored in the String array bsh. When the script completes, control is returned to the Sampler, and it copies the contents of the following script variables into the corresponding variables in the SampleResult :. The SampleResult ResponseData is set from the return value of the script. If the script returns null, it can set the response directly, by using the method SampleResult. The data type defaults to " text ", but can be set to binary by using the method SampleResult. The SampleResult variable gives the script full access to all the fields and methods in the SampleResult. For example, the script has access to the methods setStopThread boolean and setStopTest boolean. Here is a simple not very useful! Another example: ensure that the property beanshell. The following script will show the values of all the variables in the ResponseData field:. Beware however that misuse of any methods can cause subtle faults that may be difficult to find. If you don't want to generate a SampleResult when this sampler is run, call the following method: SampleResult. The JSR test elements have a feature compilation that can significantly increase performance. To benefit from this feature:. Before invoking the script, some variables are set up. Note that these are JSR variables - i. If the script returns null , it can set the response directly, by using the method SampleResult. Currently the only way to changes these is via the SampleResult methods:. It then sends the text, and waits for a response. If " Re-use connection " is selected, connections are shared between Samplers in the same thread, provided that the exact same host name string and port are used. If both of " Re-use connection " and " Close connection " are selected, the socket will be closed after running the sampler. On the next sampler, another socket will be created. You may want to close a socket at the end of each thread loop. If an error is detected - or " Re-use connection " is not selected - the socket is closed. Another socket will be reopened on the next sample. Users can provide their own implementation. The class must extend org. There are numerous JMS servers on the market and several open source options. For the MapMessage type, JMeter reads the source as lines of text. Each line must have 3 fields, delimited by commas. The fields are:. JMS Subscriber will subscribe to messages in a given destination topic or queue. This sampler sends and optionally receives JMS Messages through point-to-point connections queues. JMeter use the properties java. Messages are stored as subsamples of the main sampler. Multipart message parts are stored as subsamples of the message. Special handling for " file " protocol: The file JavaMail provider can be used to read raw messages from files. The server field is used to specify the path to the parent of the folder. Individual message files should be stored with the name n. Alternatively, the server field can be the name of a file which contains a single message. The current implementation is quite basic, and is mainly intended for debugging purposes. This sampler can also be useful in conjunction with the Transaction Controller, as it allows pauses to be included without needing to generate a sample. For variable delays, set the pause time to zero, and add a Timer as a child. The " Stop " action stops the thread or test after completing any samples that are in progress. The " Stop Now " action stops the test without waiting for samples to complete; it will interrupt any active samples. If some threads fail to stop within the 5 second time-limit, a message will be displayed in GUI mode. You can try using the Stop command to see if this will stop the threads, but if not, you should exit JMeter. The time to wait can be changed using the JMeter property jmeterengine. The time is given in milliseconds. If a security protocol is used a verification on the server certificate will occur. Two alternatives to handle this verification are available:. The OS Process Sampler is a sampler that can be used to execute commands on the local machine. It should allow execution of any command that can be run from the command line. Validation of the return code can be enabled, and the expected return code can be specified. Note that OS shells generally provide command-line parsing. This varies between OSes, but generally the shell will split parameters on white-space. Some shells expand wild-card file names; some don't. The quoting mechanism also varies between OSes. The sampler deliberately does not do any parsing or quote handling. The command and its parameters must be provided in the form expected by the executable. This means that the sampler settings will not be portable between OSes. Many OSes have some built-in commands which are not provided as separate executables. These built-ins cannot be run as independent programs, but have to be provided as arguments to the appropriate command interpreter. Before using this you need to set up a Bolt Connection Configuration. Every request uses a connection acquired from the pool and returns it to the pool when the sampler completes. The measured response time corresponds to the "full" query execution, including both the time to execute the cypher query AND the time to consume the results sent back by the database. Unlike other Logic Controllers, this controller provides no functionality beyond that of a storage device. Download this example see Figure 6. Remember, the Simple Logic Controller has no effect on how JMeter processes the controller s you add to it. Note, the File Reporter is configured to store the results in a file named " simple-test. If you add Generative or Logic Controllers to a Loop Controller, JMeter will loop through them a certain number of times, in addition to the loop value you specified for the Thread Group. Index starts at 0. The value -1 is equivalent to checking the Forever toggle. Unless set to forever, it stops the test after the given number of iterations have been done. Download this example see Figure 4. We configured the Thread Group for a single thread and a loop count value of one. Instead of letting the Thread Group control the looping, we used a Loop Controller. We configured the Loop Controller with a loop count value of five. The Once Only Logic Controller tells JMeter to process the controller s inside it only once per Thread, and pass over any requests under it during further iterations through the test plan. The Once Only Controller will now execute always during the first iteration of any looping parent controller. Thus, if the Once Only Controller is placed under a Loop Controller specified to loop 5 times, then the Once Only Controller will execute only on the first iteration through the Loop Controller i. Note this means the Once Only Controller will still behave as previously expected if put under a Thread Group runs only once per test per Thread , but now the user has more flexibility in the use of the Once Only Controller. For testing that requires a login, consider placing the login request in this controller since each thread only needs to login once to establish a session. Download this example see Figure 5. Each thread sends one request to the Home Page, followed by three requests to the Bug Page. Although we configured the Thread Group to iterate three times, each JMeter thread only sends one request to the Home Page because this request lives inside a Once Only Controller. Note, the File Reporter is configured to store the results in a file named " loop-test. If you add Generative or Logic Controllers to an Interleave Controller, JMeter will alternate among each of the other controllers for each loop iteration. Download this example see Figure 1. In this example, we configured the Thread Group to have two threads and a loop count of five, for a total of ten requests per thread. Download another example see Figure 2. In this example, we configured the Thread Group to have a single thread and a loop count of eight. The outer Interleave Controller alternates between the two inner ones. Note, the File Reporter is configured to store the results in a file named " interleave-test2. The Random Logic Controller acts similarly to the Interleave Controller, except that instead of going in order through its sub-controllers and samplers, it picks one at random at each pass. The Random Order Controller is much like a Simple Controller in that it will execute each child element at most once, but the order of execution of the nodes will be random. The Throughput Controller allows the user to control how often it is executed. There are two modes: percent execution total executions Percent executions causes the controller to execute a certain percentage of the iterations through the test plan. Total executions causes the controller to stop executing after a certain number of executions have occurred. The Runtime Controller controls how long its children how long its children will run. Controller will run its children until configured Runtime s is exceeded. The If Controller allows the user to control whether the test elements below it its children are run or not. By default, the condition is evaluated only once on initial entry, but you have the option to have it evaluated for every runnable element contained in the controller. The best option default one is to check Interpret Condition as Variable Expression? If the Variable Expression option is selected, then the expression is evaluated and compared with " true ", without needing to use JavaScript. The While Controller runs its children until the condition is " false ". The Switch Controller acts like the Interleave Controller in that it runs one of the subordinate elements on each iteration, but rather than run them in sequence, the controller runs the element defined by the switch value. If the switch value is out of range, it will run the zeroth element, which therefore acts as the default for the numeric case. It also runs the zeroth element if the value is the empty string. If the value is non-numeric and non-empty , then the Switch Controller looks for the element with the same name case is significant. If none of the names match, then the element named " default " case not significant is selected. If there is no default, then no element is selected, and the controller will not run anything. A ForEach controller loops through the values of a set of related variables. When you add samplers or controllers to a ForEach controller, every sample or controller is executed one or more times, where during every loop the variable has a new value. The input should consist of several variables, each extended with an underscore and a number. Each such variable must have a value. So for example when the input variable has the name inputVar , the following variables should have been defined:. When the return variable is given as " returnVar ", the collection of samplers and controllers under the ForEach controller will be executed 4 consecutive times, with the return variable having the respective above values, which can then be used in the samplers. It is especially suited for running with the regular expression post-processor. This can "create" the necessary input variables out of the result data of a previous request. Download this example see Figure 7. After the first HTTP request, a regular expression extractor is added, which extracts all the html links out of the return page and puts them in the inputVar variable. Here is another example you can download. The first RE matches, but the second does not match, so no samples are run by the second ForEach Controller. Any matches are prefixed with the string " inputVar ". In this case it will set the variable to the values " a " " b " and " c " in turn. The For 1 Sampler is another Java Sampler which uses the return variable " returnVar " as part of the sample Label and as the sampler Data. Thus the For 2 Sampler will not be run. The Module Controller provides a mechanism for substituting test plan fragments into the current test plan at run-time. A test plan fragment consists of a Controller and all the test elements samplers etc. The fragment can be located in any Thread Group. If the fragment is located in a Thread Group, then its Controller can be disabled to prevent the fragment being run except by the Module Controller. Or you can store the fragments in a dummy Thread Group, and disable the entire Thread Group. There can be multiple fragments, each with a different series of samplers under them. The module controller can then be used to easily switch between these multiple test cases simply by choosing the appropriate controller in its drop down box. This provides convenience for running many alternate test plans quickly and easily. Any fragments used by the Module Controller must have a unique name , as the name is used to find the target controller when a test plan is reloaded. For this reason it is best to ensure that the Controller name is changed from the default - as shown in the example above - otherwise a duplicate may be accidentally created when new elements are added to the test plan. The include controller is designed to use an external JMX file. To use it, create a Test Fragment underneath the Test Plan and add any desired samplers, controllers etc. Then save the Test Plan. The file is now ready to be included as part of other Test Plans. A Module Controller can be used to reference the Test Fragment. The Thread Group will be ignored during the include process. If the test uses a Cookie Manager or User Defined Variables, these should be placed in the top-level test plan, not the included file, otherwise they are not guaranteed to work. The Transaction Controller generates an additional sample which measures the overall time taken to perform the nested test elements. The generated sample time includes all the times for the nested samplers excluding by default since 2. Depending on the clock resolution, it may be slightly longer than the sum of the individual samplers plus timers. The clock might tick after the controller recorded the start time but before the first sample starts. Similarly at the end. In parent mode, the individual samples can still be seen in the Tree View Listener, but no longer appear as separate entries in other Listeners. The Recording Controller is a place holder indicating where the proxy server should record samples to. During test run, it has no effect, similar to the Simple Controller. The figure below shows an example of using Critical Section Controller, in the figure below 2 Critical Section Controllers ensure that:. The saving and reading of test results is generic. The various listeners have a panel whereby one can specify the file to which the results will be written or read from. By default, the results are stored as XML files, typically with a ". Listeners do not process sample data in CLI mode, but the raw data will be saved if an output file has been configured. In order to analyse the data generated by a CLI run, you need to load the file into the appropriate Listener. When reading from CSV results files, the header if present is used to determine which fields are present. In order to interpret a header-less CSV file correctly, the appropriate properties must be set in jmeter. XML files written by JMeter have version 1. This is done for historical compatibility reasons; see Bug and Bug This causes strict XML parsers to fail. Listeners can use a lot of memory if there are a lot of samples. Most of the listeners currently keep a copy of every sample in their scope, apart from:. The following Listeners no longer need to keep copies of every single sample. Instead, samples with the same elapsed time are aggregated. Less memory is now needed, especially if most samples only take a second or two at most. For full details on setting up the default items to be saved see the Listener Default Configuration documentation. Listeners can be configured to save different items to the result log files JTL by using the Config popup as shown below. The defaults are defined as described in the Listener Default Configuration documentation. CSV format cannot currently be used to save any items that include line-breaks. Note that cookies, method and the query string are saved as part of the " Sampler Data " option. The Graph Results listener generates a simple graph that plots all sample times. Along the bottom of the graph, the current sample black , the current average of all samples blue , the current standard deviation red , and the current throughput rate green are displayed in milliseconds. This calculation includes any delays you added to your test and JMeter's own internal processing time. Whereas if you made calculations that factored out delays and JMeter's processing, it would be unclear what you could conclude from that number. The following table briefly describes the items on the graph. Further details on the precise meaning of the statistical terms can be found on the web - e. Wikipedia - or by consulting a book on statistics. The individual figures at the bottom of the display are the current values. The value displayed on the top left of graph is the max of 90 th percentile of response time. The Assertion Results visualizer shows the Label of each sample taken. It also reports failures of any Assertions that are part of the test plan. There are several ways to view the response, selectable by a drop-down box at the bottom of the left hand panel. Scroll automatically? With Search option, most of the views also allow the displayed data to be searched; the result of the search will be high-lighted in the display above. For example the Control panel screenshot below shows one result of searching for " Java ". Note that the search operates on the visible text, so you may get different results when searching the Text and HTML views. If there is no content-type provided, then the content will not be displayed in the any of the Response Data panels. You can use Save Responses to a file to save the data in this case. Note that the response data will still be available in the sample result, so can still be accessed using Post-Processors. If the response data is larger than K, then it won't be displayed. To change this limit, set the JMeter property view. You can also use save the entire response to a file using Save Responses to a file. Additional renderers can be created. The class must implement the interface org. SamplerResultTab , and the compiled code must be available to JMeter e. Figure 9 below shows an example of an XML display. Figure 9a below shows an example of a Regexp tester display. Figure 9b below shows an example of a Document display. The throughput is calculated from the point of view of the sampler target e. JMeter takes into account the total time over which the requests have been generated. If other samplers and timers are in the same thread, these will increase the total time, and therefore reduce the throughput value. So two identical samplers with different names will have half the throughput of two samplers with the same name. It is important to choose the sampler names correctly to get the best results from the Aggregate Report. JMeter now combines samples with the same elapsed time, so far less memory is used. However, for samples that take more than a few seconds, the probability is that fewer samples will have identical times, in which case more memory will be needed. Note you can use this listener afterwards to reload a CSV or XML results file which is the recommended way to avoid performance impacts. See the Summary Report for a similar Listener that does not store individual samples and so needs constant memory. The figure below shows an example of selecting the " Include group name " checkbox. By default, it only displays the main parent samples; it does not display the sub-samples child samples. JMeter has a " Child Samples? If this is selected, then the sub-samples are displayed instead of the main samples. The mailer visualizer can be set up to send email if a test run receives too many failed responses from the server. The test element supports the ThreadListener and TestListener methods. These should be defined in the initialisation file. For details of all the methods available on each of the above variables, please check the Javadoc. If the property beanshell. It is important to choose the sampler labels correctly to get the best results from the Report. This test element can be placed anywhere in the test plan. For each sample in its scope, it will create a file of the response Data. The primary use for this is in creating functional tests, but it can also be useful where the response is too large to be displayed in the View Results Tree Listener. The file name is created from the specified prefix, plus a number unless this is disabled, see below. The file extension is created from the document type, if known. If not known, the file extension is set to ' unknown '. If numbering is disabled, and adding a suffix is disabled, then the file prefix is taken as the entire file name. This allows a fixed file name to be generated if required. The generated file name is stored in the sample response, and can be saved in the test log output file if required. The current sample is saved first, followed by any sub-samples child samples. If a variable name is provided, then the names of the files are saved in the order that the sub-samples appear. See below. The label is used to group sample results together. So if you have multiple Thread Groups and want to summarize across them all, then use the same label - or add the summariser to the Test Plan so all thread groups are in scope. Different summary groupings can be implemented by using suitable labels and adding the summarisers to appropriate parts of the test plan. The following parameters apply to the GraphiteBackendListenerClient implementation:. Since JMeter 3. It is called InfluxdbBackendListenerClient. The following parameters apply to the InfluxdbBackendListenerClient implementation:. See also Real-time results and Influxdb annotations in Grafana for more details. There is also a subsection on configuring the listener for InfluxDB v2. Since JMeter 5. It is worth noting that this will use more resources than the InfluxdbBackendListenerClient , both by JMeter and InfluxDB due to the increase in data and individual writes. It is well suited to handling large numbers of variables, and is also useful for testing with "random" and unique values. Generating unique random values at run-time is expensive in terms of CPU and memory, so just create the data in advance of the test. If necessary, the "random" data from the file can be used in conjunction with a run-time parameter to create different sets of values from each run - e. JMeter allows values to be quoted; this allows the value to contain a delimiter. If " allow quoted data " is enabled, a value may be enclosed in double-quotes. These are removed. To include double-quotes within a quoted field, use two double-quotes. For example:. JMeter supports CSV files which have a header line defining the column names. To enable this, leave the " Variable Names " field empty. The correct delimiter must be provided. By default, the file is only opened once, and each thread will use a different line from the file. However the order in which lines are passed to threads depends on the order in which they execute, which may vary between iterations. Lines are read at the start of each test iteration. The file name and mode are resolved in the first iteration. See the description of the Share mode below for additional options. If you want each thread to have its own set of values, then you will need to create a set of files, one for each thread. For example test1. When the end of file EOF is reached, and the recycle option is true , reading starts again with the first line of the file. This value can be changed by setting the JMeter property csvdataset. That's why only one server from the cluster receives load. These entries will be preferred over the custom resolver. Use custom DNS resolver has to be enabled, if you want to use this mapping. Say, you have a test server, that you want to reach with a name, that is not yet set up in your DNS servers. For our example, this would be www. You would type www. As the name of the second column implies, you could even use the IP address of your test server there. When none is given, the system DNS resolver will be used. Now you can use www. The Authorization Manager lets you specify one or more user logins for web pages that are restricted using server authentication. You see this type of authentication when you use your browser to access a restricted page, and your browser displays a login dialog box. JMeter transmits the login information when it encounters this type of page. The Java implementation does pre-emptive authentication, but it does not return the Authorization header when JMeter fetches the headers. The HttpComponents HC 4. X implementation defaults to pre-emptive since 3. To disable this, set the values as below, in which case authentication will only be performed in response to a challenge. In the file jmeter. Look at the two sample configuration files krb5. If you want to enable it, you can do so by setting the property kerberos. Chrome has an option --enable-auth-negotiate-port to include the port number if it differs from the standard ones 80 and That behavior can be emulated by setting the following JMeter property as below. In jmeter. Download this example. In this example, we created a Test Plan on a local server that sends three HTTP requests, two requiring a login and the other is open to everyone. See figure 10 to see the makeup of our Test Plan. On our server, we have a restricted directory named, " secret ", which contains two files, " index. We created a login id named, " kevin ", which has a password of " spot ". So, in our Authorization Manager, we created an entry for the restricted directory and a username and password see figure Each Virtual User thread has its own Cache. Use property " maxSize " to modify this value. If a sample is successful i. Before executing the next sample, the sampler checks to see if there is an entry in the cache, and if so, the If-Last-Modified and If-None-Match conditional headers are set for the request. If the request is a GET request, and the timestamp is in the future, then the sampler returns immediately, without requesting the URL from the remote server. This is intended to emulate browser behaviour. Note that if Cache-Control header is " no-cache ", the response will be stored in cache as pre-expired, so will generate a conditional GET request. If Cache-Control has any other value, the " max-age " expiry option is processed to compute entry lifetime, if missing then expire header will be used, if also missing entry will be cached as specified in RFC section The Cookie Manager element has two functions: First, it stores and sends cookies just like a web browser. If you have an HTTP Request and the response contains a cookie, the Cookie Manager automatically stores that cookie and will use it for all future requests to that particular web site. Each JMeter thread has its own "cookie storage area". So, if you are testing a web site that uses a cookie for storing session information, each JMeter thread will have its own session. Note that such cookies do not appear on the Cookie Manager display, but they can be seen using the View Results Tree Listener. JMeter checks that received cookies are valid for the URL. This means that cross-domain cookies are not stored. Received Cookies can be stored as JMeter thread variables. To save cookies as variables, define the property " CookieManager. Second, you can manually add a cookie to the Cookie Manager. However, if you do this, the cookie will be shared by all JMeter threads. Cookies with null values are ignored by default. This can be changed by setting the JMeter property: CookieManager. Note that this also applies to manually defined cookies - any such cookies will be removed from the display when it is updated. Note also that the cookie name must be unique - if a second cookie is defined with the same name, it will replace the first. JMeter now supports multiple Header Managers. The header entries are merged to form the list for the sampler. If an entry to be merged matches an existing header name, it replaces the previous entry. This allows one to set up a default set of headers, and apply adjustments to particular samplers. Note that an empty value for a header does not remove an existing header, it justs replace its value. In this example, we created a Test Plan that tells JMeter to override the default " User-Agent " request header and use a particular Internet Explorer agent string instead. The Java Request Defaults component lets you set default values for Java testing. See the Java Request. The list of the validation queries can be configured with jdbc. The list of the preconfigured jdbc driver classes can be configured with jdbc. Some possible settings are shown below. Please check the exact details in the JDBC driver documentation. If the database server is not running or is not accessible, then JMeter will report a java. The Keystore Config Element lets you configure how Keystore will be loaded and which keys it will use. This component is typically used in HTTPS scenarios where you don't want to take into account keystore initialization into account in response time. To use this element, you need to setup first a Java Key Store with the client certificates you want to test, to do that:. To use PKCS11 as the source for the store, you need to set javax. The Login Config Element lets you add or override username and password settings in samplers that use username and password as part of their setup. The User Defined Variables element lets you define an initial set of variables , just as in the Test Plan. Note that all the UDV elements in a test plan - no matter where they are - are processed at the start. So you cannot reference variables which are defined as part of a test run, e. UDVs should not be used with functions that generate different results each time they are called. Only the result of the first function call will be saved in the variable. For defining variables during a test run, see User Parameters. UDVs are processed in the order they appear in the Plan, from top to bottom. Once the Test Plan and all UDVs have been processed, the resulting set of variables is copied to each thread to provide the initial set of variables. If a runtime element such as a User Parameters Pre-Processor or Regular Expression Extractor defines a variable with the same name as one of the UDV variables, then this will replace the initial value, and all other test elements in the thread will see the updated value. The Random Variable Config Element is used to generate random numeric strings and store them in variable for use later. The output variable is constructed by using the random number generator, and then the resulting number is formatted using the format string. This means that maximum-minimum - i. Allows the user to create a counter that can be referenced anywhere in the Thread Group. The counter config lets the user configure a starting point, a maximum, and the increment. The counter will loop from the start to the max, and then start over with the start, continuing on like that until the test is ended. The Simple Config Element lets you add or override arbitrary values in samplers. You can choose the name of the value and the value itself. Although some adventurous users might find a use for this element, it's here primarily for developers as a basic GUI that they can use while developing new JMeter components. You can then access com. Assertions are used to perform additional checks on samplers, and are processed after every sampler in the same scope. To ensure that an Assertion is applied only to a particular sampler, add it as a child of the sampler. Assertions can be applied to either the main sample, the sub-samples or both. The default is to apply the assertion to the main sample only. If the Assertion supports this option, then there will be an entry on the GUI which looks like the following:. If a sub-sampler fails and the main sample is successful, then the main sample will be set to failed status and an Assertion Result will be added. If the JMeter variable option is used, it is assumed to relate to the main sample, and any failure will be applied to the main sample only. The response assertion control panel lets you add pattern strings to be compared against various fields of the request or response. The pattern strings are:. A summary of the pattern matching characters can be found at ORO Perl5 regular expressions. You can also choose whether the strings will be expected to match the entire response, or if the response is only expected to contain the pattern. You can attach multiple assertions to any controller for additional flexibility. Note that the pattern string should not include the enclosing delimiters, i. By default, the pattern is in multi-line mode, which means that the ". Case is also significant. To override these settings, one can use the extended regular expression syntax. The overall success of the sample is determined by combining the result of the assertion with the existing Response status. When the Ignore Status checkbox is selected, the Response status is forced to successful before evaluating the Assertion. The Duration Assertion tests that each response was received within a given amount of time. Any response that takes longer than the given number of milliseconds specified by the user is marked as a failed response. The Size Assertion tests that each response contains the right number of bytes in it. You can specify that the size be equal to, greater than, less than, or not equal to a given number of bytes. Note that a different Interpreter is used for each independent occurrence of the assertion in each thread in a test script, but the same Interpreter is used for subsequent invocations. This means that variables persist across calls to the assertion. There is a sample init file in the bin directory: BeanShellAssertion. Before invoking the script, some variables are set up in the BeanShell interpreter. These are strings unless otherwise noted:. If that XPath exists, the Assertion is true. The XPath2 Assertion tests a document for well formedness. The script can check various aspects of the SampleResult. If an error is detected, the script should use AssertionResult. For further details of all the methods available on each of the above variables, please check the Javadoc. If using the Mail Reader Sampler , please ensure that you select " Store the message using MIME raw " otherwise the Assertion won't be able to process the message correctly. This component allows you to perform validations of JSON documents. Second, it will search for specified path, using syntax from Jayway JsonPath 1. If the path is not found, it will fail. Third, if JSON path was found in the document, and validation against expected value was requested, it will perform validation. For the null value there is special checkbox in the GUI. Note that if the path will return array object, it will be iterated and if expected value is found, the assertion will succeed. To validate empty array use [] string. Also, if patch will return dictionary object, it will be converted to string before comparison. Third, if JMES path was found in the document, and validation against expected value was requested, it will perform this additional check. If you want to check for nullity, use the Expect null checkbox. Note that the path cannot be null as the expression JMESPath will not be compiled and an error will occur. If you want to have each thread pause for the same amount of time between requests, use this timer. This timer pauses each thread request for a random amount of time, with most of the time intervals occurring near a particular value. The total delay is the sum of the Gaussian distributed value with mean 0. Another way to explain it, in Gaussian Random Timer, the variation around constant offset has a Gaussian curve distribution. This timer pauses each thread request for a random amount of time, with each time interval having the same probability of occurring. The total delay is the sum of the random value and the offset value. This timer introduces variable pauses, calculated to keep the total throughput in terms of samples per minute as close as possible to a give figure. Of course the throughput will be lower if the server is not capable of handling it, or if other timers or time-consuming test elements prevent it. It can be defined in terms of a variable or function call, and the value can be changed during a test. The value can be changed in various ways:. See Best Practices for further details. Note that the throughput value should not be changed too often during a test - it will take a while for the new value to take effect. The shared and non-shared algorithms both aim to generate the desired throughput, and will produce similar results. The shared algorithm should generate a more accurate overall transaction rate. The non-shared algorithm should generate a more even spread of transactions across threads. This timer introduces variable pauses, calculated to keep the total throughput e. Of course the throughput will be lower if the server is not capable of handling it, or if other timers, or if there's not enough threads, or time-consuming test elements prevent it. Although the Timer is called Precise Throughput Timer, it does not aim to produce precisely the same number of samples over one-second intervals during the test. As you might know, the timers are inherited by all the siblings and their child elements. That is why one of the best places for Precise Throughput Timer is under the first element in a test loop. For instance, you might add a dummy sampler at the beginning, and place the timer under that dummy sampler. Precise Throughput Timer models Poisson arrivals schedule. That schedule often happens in a real-life, so it makes sense to use that for load testing. For instance, it naturally might generate samples that are close together thus it might reveal concurrency issues. Even if you manage to generate Poisson arrivals with Poisson Random Timer , it would be susceptible to the issues listed below. For instance, true Poisson arrivals might have indefinitely long pause, and that is not practical for load testing. For instance, "regular" Poisson arrivals with 1 per second rate might end up with 50 samples over 60 second long test. Constant Throughput Timer converges to the specified rate, however it tends to produce samples at even intervals. You might used "ramp-up" or similar approaches to avoid a spike at the test start. For instance, if you configure Thread Group to have threads, and set Ramp-up Period to 0 or to a small number , then all the threads would start at the same time, and it would produce an unwanted spike of the load. On top of that, if you set Ramp-up Period too high, it might result in " too few " threads being available at the very beginning to achieve the required load. Precise Throughput Timer schedules executions in a random way, so it can be used to generate constant load, and it is recommended to set both Ramp-up Period and Delay to 0. To mitigate that issue one typically adds "random" delay to each Thread Group so threads start at different times. Precise Throughput Timer avoids that issue since it schedules executions in a random way. You do not need to add extra random delays to mitigate startup spike. One of the basic requirements is to issue N samples per M minutes. Let it be 60 iterations per hour. Business customers would not understand if you report load test results with 57 executions "just because the random was random". In order to generate 60 iterations per hour, you need to configure as follows other parameters could be left with their default values. The first two options set the throughput. Test duration seconds is there so the timer ensures exact number of samples for a given test duration. Precise Throughput Timer creates a schedule for the samples at the test startup. For instance, if you wish to perform 5 minutes test with 60 per hour throughput, you would set Test duration seconds to This enables to configure throughput in a business-friendly way. Note: Test duration seconds does not limit test duration. It is just a hint for the timer. One of the common pitfalls is to adjust number of threads and think times in order to end up with the desired throughput. Even though it might work, that approach results in lots of time spent on the test runs. It might require to adjust threads and delays again when new application version arrives. Precise Throughput Timer enables to set throughput goal and go for it no matter how well application performs. In order to do that, Precise Throughput Timer creates a schedule at the test startup, then it uses that schedule to release threads. The main driver for the think times and number of threads should be business requirements, not the desire to match throughput somehow. For instance, if you application is used by support engineers in a call center. Suppose there are 2 engineers in the call center, and the target throughput is 1 per minute. Suppose it takes 4 minutes for the engineer to read and review the web page. For that case you should set 2 threads in the group, use 4 minutes for think time delays, and specify 1 per minute in Precise Throughput Timer. Testing at low rates e. For instance, if you need to inject load at even intervals e. However, if you need to have randomized schedule e. When comparing outcomes of multiple load tests, it is useful to be able to repeat exactly the same test profile. For instance, if action X e. Replicating the same load pattern simplifies analysis of the test results e. Random seed change from 0 to random enables to control the seed value that is used by Precise Throughput Timer. By default it is initialized with 0 and that means random seed is used for each test execution. If you need to have repeatable load pattern, then change Random seed so some random value. The general advice is to use non-zero seed, and "0 by default" is an implementation limit. Note: when using multiple thread groups with same throughput rates and same non-zero seed it might result in unwanted firing the samples at the same time. Precise Throughput Timer generates the schedule and keeps it in memory. In most cases it should not be a problem, however, remember that you might want to keep the schedule shorter than 1'' samples. Schedule for 10 million entries takes second to build and it consumes 80 megabytes in the heap. For instance, if you want to perform 2-week long test with 5' per hour rate, then you probably want to have exactly 5' samples for each hour. You can set Test duration seconds property of the timer of the timer to 1 hour. Then the timer would create a schedule of 5' samples for an hour, and when the schedule is exhausted, the timer would generate a schedule for the next hour. There might be a case when all the samples should come in pairs, triples, etc. Certain cases might be solved via Synchronizing Timer , however Precise Throughput Timer has native way to issue requests in packs. This behavior is disabled by default, and it is controlled with "Batched departures" settings. Even though property values e. As next schedule is generated, Precise Throughput Timer logs a message to jmeter. ConstantPoissonProcessGenerator: Generated 21 timings First 15 events will be fired at: 1. This shows that schedule generation took 0ms, and it shows absolute timestamps in seconds. In the case above, the rate was set to be 1 per second, and the actual timestamps became 1. The purpose of the SyncTimer is to block threads until X number of threads have been blocked, and then they are all released at once. A SyncTimer can thus create large instant loads at various points of the test plan. The total delay is the sum of the Poisson distributed value, and the offset value. Note: if you want to model Poisson arrivals, consider using Precise Throughput Timer instead. This modifier parses HTML response from the server and extracts links and forms. A URL test sample that passes through this modifier will be examined to see if it "matches" any of the links or forms extracted from the immediately previous response. It would then replace the values in the URL test sample with appropriate values from the matching link or form. Perl-type regular expressions are used to find matches. Consider a simple example: let's say you wanted JMeter to "spider" through your site, hitting link after link parsed from the HTML returned from your server this is not actually the most useful thing to do, but it serves as a good example. This will cause your test sample to match with any link found on the returned pages. If you wanted to restrict the spidering to a particular domain, then change the domain value to the one you want. Then, only links to that domain will be followed. A more useful example: given a web polling application, you might have a page with several poll options as radio buttons for the user to select. Let's say the values of the poll options are very dynamic - maybe user generated. If you wanted JMeter to test the poll, you could either create test samples with hardcoded values chosen, or you could let the HTML Link Parser parse the form, and insert a random poll option into your URL test sample. Put in hard-coded values for the domain , path , and any additional form parameters. When the modifier examines this URL test sample, it will find that it "matches" the poll form and it shouldn't match any other form, given that you've specified all the other aspects of the URL test sample , and it will replace your form parameters with the matching parameters from the form. Since the regular expression ". It will choose at random, and replace the value in your URL test sample. Each time through the test, a new random value will be chosen. Simply give it the name of the session id parameter, and it will find it on the page and add the argument to every request of that ThreadGroup. Alternatively, this modifier can be attached to select requests and it will modify only them. User Variables can also be specified in the Test Plan but not specific to individual threads. This panel allows you to specify a series of values for any User Variable. For each thread, the variable will be assigned one of the values from the series in sequence. If there are more threads than values, the values get re-used. For example, this can be used to assign a distinct user id to be used by each thread. User variables can be referenced in any field of any JMeter Component. The variable is specified by clicking the Add Variable button in the bottom of the panel and filling in the Variable name in the ' Name: ' column. To add a new value to the series, click the ' Add User ' button and fill in the desired value in the newly added column. RegEx User Parameters are specific to individual threads. This component allows you to specify reference name of a regular expression that extracts names and values of HTTP request parameters. Regular expression group numbers must be specified for parameter's name and also for parameter's value. Replacement will only occur for parameters in the Sampler that uses this RegEx User Parameters which name matches. Suppose we have a request which returns a form with 3 input parameters and we want to extract the value of 2 of them to inject them in next request. See also the Regular Expression Extractor element, which is used to extract parameters names and values. This Pre-Processor schedules a timer task to interrupt a sample if it takes too long to complete. The timeout is ignored if it is zero or negative. For this to work, the sampler must implement Interruptible. The test element is intended for use where individual timeouts such as Connection Timeout or Response Timeout are insufficient, or where the Sampler does not support timeouts. The timeout should be set sufficiently long so that it is not triggered in normal tests, but short enough that it interrupts samples that are stuck. This executes in the same thread as the timer, so if the interrupt takes a long while, it may delay the processing of subsequent timeouts. This is not expected to be a problem, but if necessary the property InterruptTimer. As the name suggests, Post-Processors are applied after samplers. Note that they are applied to all the samplers in the same scope, so to ensure that a post-processor is applied only to a particular sampler, add it as a child of the sampler. Post-Processors are run before Assertions, so they do not have access to any Assertion Results, nor will the sample status reflect the results of any Assertions. If you require access to Assertion Results, try using a Listener instead. Also note that the variable JMeterThread. Allows the user to extract values from a server response using a Perl-type regular expression. As a post-processor, this element will execute after each Sample request in its scope, applying the regular expression, extracting the requested values, generate the template string, and store the result into the given variable name. However, if you have several test elements that set the same variable, you may wish to leave the variable unchanged if the expression does not match. In this case, remove the default value once debugging is complete. If the match number is set to a non-negative number, and a match occurs, the variables are set as follows:. If no match occurs, then the refName variable is set to the default unless this is absent. Also, the following variables are removed:. If the match number is set to a negative number, then all the possible matches in the sampler data are processed. The variables are set as follows:. Note that the refName variable is always set to the default value in this case, and the associated group variables are not set. See also Response Assertion for some examples of how to specify modifiers, and for further information on JMeter regular expressions. Note that the refName variable is always set to the default value in this case. XPath2 Extractor provides some interestings tools such as an improved syntax and much more functions than in it's first version. To see more information about these functions, please check xPath2 functions. To allow for use in a ForEach Controller , the following variables are set on return:. However it is useful as generic query language for structured data too. Here are few examples:. It is described in an ABNF grammar with a complete specification. This ensures that the language syntax is precisely defined. This post processor is very similar to Regular expression extractor. Allows the user to extract values from a server response using left and right boundaries. As a post-processor, this element will execute after each Sample request in its scope, testing the boundaries, extracting the requested values, generate the template string, and store the result into the given variable name. Static variables can be defined for values that are repeated throughout a test, such as server names. This simplifies changing the name later. If the same variable name is reused on one of more User Defined Variables Configuration elements, the value is set to the last definition in the test plan reading from top to bottom. Such variables should be used for items that may change between test runs, but which remain the same during a test run. Note that the Test Plan cannot refer to variables it defines. If you need to construct other variables from the Test Plan variables, use a User Defined Variables test element. This increases the resources needed to run a test, and may adversely impact JMeter performance. If more data is required for a particular sampler only, then add a Listener to it, and configure the fields as required. The option does not affect CSV result files, which cannot currently store such information. Also, an option exists here to instruct JMeter to run the Thread Group serially rather than in parallel. Run tearDown Thread Groups after shutdown of main threads: if selected, the tearDown groups if any will be run after graceful shutdown of the main threads. The tearDown threads won't be run if the test is forcibly stopped. Test plan now provides an easy way to add classpath setting to a specific test plan. The feature is additive, meaning that you can add jar files or directories, but removing an entry requires restarting JMeter. However it can be useful for utility jars such as JDBC drivers. The jars are only added to the search path for the JMeter loader, not for the system class loader. JMeter properties also provides an entry for loading additional classpaths. A Thread Group defines a pool of users that will execute a particular test case against your server. In the Thread Group GUI, you can control the number of users simulated number of threads , the ramp up time how long it takes to start all the threads , the number of times to perform the test, and optionally, a start and stop time for the test. Note that the condition is only checked between samples; when the end condition is reached, that thread will stop. JMeter does not interrupt samplers which are waiting for a response, so the end time may be delayed arbitrarily. A popup menu will appear: Popup menu to start a selection of Thread Groups Notice you have three options to run the selection of Thread Groups: Start Start the selected thread groups only Start no pauses Start the selected thread groups only but without running the timers Validate Start the selected thread groups only using validation mode. Per default this runs the Thread Group in validation mode see below Validation Mode: This mode enables rapid validation of a Thread Group by running it with one thread, one iteration, no timers and no Startup delay set to 0. Behaviour can be modified with some properties by setting in user. Defaults to false. It is only needed if you have not set up the appropriate System properties. There is a feature of the JSSE libraries that require you to have at least a six character password on your key at least for the keytool utility that comes with your JDK. You will be presented with a file finder that looks for PKCS12 files by default. Your PKCS12 file must have the extension '. Any other file will be treated like an average JKS key store. If JSSE is correctly installed, you will be prompted for the password. The text box does not hide the characters you type at this point -- so make sure no one is looking over your shoulder. The current implementation assumes that the password for the keystore is also the password for the private key of the client you want to authenticate as. Or you can set the appropriate System properties - see the system. The next time you run your test, the SSL Manager will examine your key store to see if it has at least one key available to it. If there is only one key, SSL Manager will select it for you. If there is more than one key, it currently selects the first key. There is currently no way to select other entries in the keystore, so the desired key must be the first. This file will be read before the " cacerts " file in the same directory. Keep in mind that as long as the " jssecacerts " file exists, the certificates installed in " cacerts " will not be used. This may cause problems for you. If you don't mind importing your CA certificate into the " cacerts " file, then you can authenticate against all of the CA certificates installed. JMeter will create test sample objects and store them directly into your test plan as you go so you can view samples interactively while you make them. Ensure you read this wiki page to setup correctly JMeter. Ideally use private browsing mode when recording the session. This should ensure that the browser starts with no stored cookies, and prevents certain changes from being saved. For example, Firefox does not allow certificate overrides to be saved permanently. HTTPS connections use certificates to authenticate the connection between the browser and the web server. To authenticate the certificate, the browser checks that the server certificate is signed by a Certificate Authority CA that is linked to one of its in-built root CAs. Browsers also check that the certificate is for the correct host or domain, and that it is valid and not expired. If any of the browser checks fail, it will prompt the user who can then decide whether to allow the connection to proceed. Effectively JMeter has to pretend to be the target server. JMeter will generate its own certificate s. These are generated with a validity period defined by the property proxy. If JMeter detects that it is running under Java 8 or later, it will generate certificates for each target server as necessary dynamic mode unless the following property is defined: proxy. When using dynamic mode, the certificate will be for the correct host name, and will be signed by a JMeter-generated CA certificate. By default, this CA certificate won't be trusted by the browser, however it can be installed as a trusted certificate. Once this is done, the generated server certificates will be accepted by the browser. This has the advantage that even embedded HTTPS resources can be intercepted, and there is no need to override the browser checks for each new server. Browsers don't prompt for embedded resources. So with earlier versions, embedded resources would only be downloaded for servers that were already 'known' to the browser. Unless a keystore is provided and you define the property proxy. JMeter includes code to check that keytool is available by looking in various standard places. If JMeter is unable to find the keytool application, it will report an error. If necessary, the system property keytool. This should be defined in the file system. The JMeter certificates are generated if necessary when the Start button is pressed. Certificate generation can take some while, during which time the GUI will be unresponsive. The cursor is changed to an hour-glass whilst this is happening. When certificate generation is complete, the GUI will display a pop-up dialogue containing the details of the certificate for the root CA. This certificate needs to be installed by the browser in order for it to accept the host certificates generated by JMeter; see below for details. This certificate is not one of the certificates that browsers normally trust, and will not be for the correct host. As a consequence:. Versions of JMeter from 2. As mentioned above, when run under Java 8, JMeter can generate certificates for each server. For this to work smoothly, the root CA signing certificate used by JMeter needs to be trusted by the browser. The first time that the recorder is started, it will generate the certificates if necessary. When the certificates have been set up, JMeter will show a dialog with the current certificate details. At this point, the certificate can be imported into the browser, as per the instructions below. Note that once the root CA certificate has been installed as a trusted CA, the browser will trust any certificates signed by it. Until such time as the certificate expires or the certificate is removed from the browser, it will not warn the user that the certificate is being relied upon. So anyone that can get hold of the keystore and password can use the certificate to generate certificates which will be accepted by any browsers that trust the JMeter root CA certificate. For this reason, the password for the keystore and private keys are randomly generated and a short validity period used. The passwords are stored in the local preferences area. Please ensure that only trusted users have access to the host with the keystore. During recording, the browser will follow a redirect response and generate an additional request. The Proxy will record both the original request and the redirected request subject to whatever exclusions are configured. The generated samples have " Follow Redirects " selected by default, because that is generally better. Redirects may depend on the original request, so repeating the originally recorded sample may not always work. Now if JMeter is set to follow the redirect during replay, it will issue the original request, and then replay the redirect request that was recorded. To avoid this duplicate replay, JMeter tries to detect when a sample is the result of a previous redirect. When the next request is received, it is compared with the saved redirect URL and if there is a match, JMeter will disable the generated sample. It also adds comments to the redirect chain. This assumes that all the requests in a redirect chain will follow each other without any intervening requests. To disable the redirect detection, set the property proxy. The include and exclude patterns are treated as regular expressions using Jakarta ORO. They will be matched against the host name, port actual or implied , path and query if any of each browser request. Thus, if you want to include all. If there are any include patterns, then the URL must match at least one of the patterns , otherwise it will not be recorded. If there are any exclude patterns, then the URL must not match any of the patterns , otherwise it will not be recorded. Using a combination of includes and excludes, you should be able to record what you are interested in and skip what you are not. To configure which content-types are treated as binary, update the JMeter property proxy. The default settings are as follows:. It is also possible to have the proxy add timers to the recorded script. The proxy will place a copy of this timer into each sample it records, or into the first sample of each group if you're using grouping. JMeter places the recorded samples in the Target Controller you choose. If you choose the default option " Use Recording Controller ", they will be stored in the first Recording Controller found in the test object tree so be sure to add a Recording Controller before you start recording. If the Proxy does not seem to record any samples, this could be because the browser is not actually using the proxy. To check if this is the case, try stopping the proxy. If the browser still downloads pages, then it was not sending requests via the proxy. Double-check the browser options. If you are trying to record from a server running on the same host, then check that the browser is not set to " Bypass proxy server for local addresses " this example is from IE7, but there will be similar options for other browsers. If the HTTP S Test Script Recorder finds enabled HTTP Request Defaults directly within the controller where samples are being stored, or directly within any of its parent controllers, the recorded samples will have empty fields for the default values you specified. Similarly, if the HTTP S Test Script Recorder finds User Defined Variables UDV directly within the controller where samples are being stored, or directly within any of its parent controllers, the recorded samples will have any occurrences of the values of those variables replaced by the corresponding variable. To avoid this happening everywhere, set the " Regex Matching " check-box. This tells the proxy server to treat values as Regexes using the perl5 compatible regex matchers provided by ORO. That way each match will start and end at a word boundary. If you don't want your regex to be enclosed with those boundary matchers, you have to enclose your regex within parens, e. Look out for overlapping matchers. For example the value. If there are any problems interpreting any variables as patterns, these are reported in jmeter. When you are done recording your test samples, stop the proxy server hit the " stop " button. Remember to reset your browser's proxy settings. Now, you may want to sort and re-order the test script, add timers, listeners, a cookie manager, etc. You can also add a Save Responses to a file Post-Processor which will save the responses to files. If you define the property proxy. Note that there may be more responses than samplers if excludes or includes have been used. If the server you are testing against uses cookies, remember to add an HTTP Cookie Manager to the test plan when you have finished recording it. During recording, the browser handles any cookies, but JMeter needs a Cookie Manager to do the cookie handling during a test run. The JMeter Proxy server passes on all cookies sent by the browser during recording, but does not save them to the test plan because they are likely to change between runs. Otherwise Authorization Manager will be added to target controller with authorization object. You may have to fix automatically computed values after recording. Some browsers e. Firefox and Opera don't include the full name of a file when uploading files. This can cause the JMeter proxy server to fail. One solution is to ensure that any files to be uploaded are in the JMeter working directory, either by copying the files there or by starting JMeter in the directory containing the files. Although JMeter does not provide a native proxy implementation to record these protocols, you have the ability to record these protocols by implementing a custom SamplerCreator. For more details see "Extending JMeter". This is useful for checking the content of HTTP requests. Values can be changed by entering new text in the Value column. The behavior of these threads is exactly like a normal Thread Group element. The difference is that these type of threads execute before the test proceeds to the executing of regular Thread Groups. The difference is that these type of threads execute after the test has finished executing its regular Thread Groups. Twitter github. Several test elements use JMeter properties to control their behaviour. These properties are normally resolved when the class is loaded. When downloading a file, it can be stored on disk Local File or in the Response Data, or both. Latency is set to the time it takes to login. Port to use. File to upload, or destination for downloads defaults to remote file name. Provides the contents for the upload, overrides the Local File property. Whether to store contents of retrieved file in response data. FTP account password. This will be visible in the test plan. The following types of embedded resource are retrieved: images applets stylesheets CSS and resources referenced from those files external scripts frames, iframes background images body, table, TD, TR background sound The default parser is org. This has some limitations in comparison with the HttpClient implementations - see below. POST method is selected by default. File Upload tab: irrelevant to GraphQL queries. When a connection is released by JMeter, it may or may not be re-used by the same thread. The API is best suited to single-threaded usage - various settings are defined via system properties, and therefore apply to all connections. No support of Kerberos authentication It does not support client based certificate testing with Keystore Config. Better control of Retry mechanism It does not support virtual hosts. Note: the FILE protocol is intended for testing purposes only. Domain name or IP address of the web server, e. Port the web server is listening to. Default: Connection Timeout. Number of milliseconds to wait for a connection to open. Response Timeout. Number of milliseconds to wait for a response. Note that this applies to each wait for a response. If the server response is sent in several chunks, the overall elapsed time may be longer than the timeout. Hostname or IP address of a proxy server to perform request. Optional password for proxy server. Java , HttpClient4. Default: HTTP. Sets the underlying http protocol handler to automatically follow redirects, so they are not seen by JMeter, and thus will not appear as samples. This only has any effect if " Redirect Automatically " is not enabled. If set, the JMeter sampler will check if the response is a redirect and follow it if so. The initial redirect and further responses will appear as additional samples. The URL and data fields of the parent sample will be taken from the final non-redirected sample, but the parent byte count and elapsed time include all samples. The latency is taken from the initial response. Note that the HttpClient sampler may log the following message: "Redirect requested but followRedirects is disabled" This can be ignored. If necessary, this behaviour can be suppressed by setting the JMeter property httpsampler. JMeter sets the Connection: keep-alive header. This does not work properly with the default HTTP implementation, as connection re-use is not under user-control. If the resource requires query string parameters, add them below in the "Send Parameters With the Request" section. The query string will be generated from the list of parameters you provide. Each parameter has a name and value , the options to encode the parameter, and an option to include or exclude an equals sign some applications don't expect an equals sign when the value is the empty string. The query string will be generated in the correct fashion, depending on the choice of "Method" you made i. Also, if you are sending a file using a multipart form, the query string will be created using the multipart form specifications. Name of the file to send. If left blank, JMeter does not send a file, if filled in, JMeter automatically sends the request as a multipart form request. Value of the " name " web request parameter. If it is a POST or PUT or PATCH request and either the ' name ' attribute below are omitted or the request body is constructed from parameter values only, then the value of this field is used as the value of the content-type request header. See below for more details. If this is selected, then the response is not stored in the sample result. Instead, the 32 character MD5 hash of the data is calculated and stored instead. This is intended for testing large amounts of data. If present, this must be a regular expression that is used to match against any embedded URLs found. If present, this must be a regular expression that is used to filter out any embedded URLs found. Pool size for concurrent connections used to get embedded resources. It overrides the default local IP address for this sample. The JMeter host must have multiple IP addresses i. IP aliases, network interfaces, devices. The value can be a host name, IP address, or a network interface device such as " eth0 " or " lo " or " wlan0 ". If the property httpclient. Optional GraphQL operation name when making a request for multi-operation documents. This can cause unexpected behaviour for web-sites that redirect to a local server. In this case the server will probably return cookies for both URLs, but JMeter will only see the cookies for the last host, i. If the next request in the test plan uses www. Likewise, Headers are sent for the initial request, and won't be sent for the redirect. This is generally only a problem for manually created test plans, as a test plan created using a recorder would continue from the redirected URL. Note that once you leave the Tree node, you cannot switch back to the parameter tab unless you clear the Body Data tab from its data. The Java implementation does not include transport overhead such as chunk headers in the response body size. Before using this you need to set up a JDBC Connection Configuration Configuration element If the Variable Names list is provided, then for each row returned by a Select statement, the variables are set up with the value of the corresponding column if a variable name is provided , and the count of rows is also set up. Name of the JMeter variable that the connection pool is bound to. The types Commit , Rollback , Autocommit false and Autocommit true are special, as they are ignoring the given SQL statements and are changing the state of the connection, only. Comma-separated list of parameter values. If required, the null string can be changed by defining the property " jdbcsampler. The list must be enclosed in double-quotes if any of the values contain a comma or double-quote, and any embedded double-quotes must be doubled-up, for example: "Dbl-Quote: "" and Comma: ,". There must be as many values as there are placeholders in the statement even if your parameters are OUT ones. Be sure to set a value even if the value will not be used for example in a CallableStatement. Comma-separated list of SQL parameter types e. Those integer values can be used, when you use custom database types proposed by driver For example OracleTypes. These are defined as fields in the class java. Types , see for example: Javadoc for java. Note: JMeter will use whatever types are defined by the runtime JVM, so if you are running on a different JVM, be sure to check the appropriate documentation. Comma-separated list of variable names to hold values returned by Select statements, Prepared Select Statements or CallableStatement. Note that when used with CallableStatement, list of variables must be in the same sequence as the OUT parameters returned by the call. If there are less variable names than OUT parameters only as many results shall be stored in the thread-context variables as variable names were supplied. If more variable names than OUT parameters exist, the additional variables will be ignored. If specified, this will create an Object variable containing a list of row maps. Each map contains the column name as the key and the column data as the value. Set a timeout in seconds for query, empty value means 0 which is infinite. Defaults to 0. Limits the number of rows to iterate through the ResultSet. Empty value means -1 , e. This can help to reduce the amount of data to be fetched from the database via the JDBC driver, but affects all possible options of Handle ResultSet respectively — e. Defines how ResultSet returned from callable statements be handled: Store As String default - All variables on Variable Names list are stored as strings, will not iterate through a ResultSet when present on the list. CLOB s will be converted to Strings. BLOBs will be stored as a byte array. Count Records - Variables of ResultSet types will be iterated through showing the count of records as result. Variables will be stored as Strings. For BLOB s the size of the object will be stored. Previously the platform default was used. Screenshot of Control-Panel of Java Request. If the method teardownTest is not overridden by a subclass of AbstractJavaSamplerClient , its teardownTest method will not be called. This reduces JMeter memory requirements. This will not have any impact on existing Test plans. Descriptive name for this sampler that is shown in the tree. The specific implementation of the JavaSamplerClient interface to be sampled. A list of arguments that will be passed to the sampled class. All arguments are sent as Strings. See below for specific settings. The label to use. If provided, overrides Name. If provided, sets the SampleResult Status. If this equals " OK " ignoring case then the status is set to success, otherwise the sample is marked as failed. The same way the Login Config Element also using for Login and password. LDAP server password. You have to set the right attributes of the object yourself. Use these name , value pairs for creation of the new object in the given context. Use these name , value pairs for modification of the given context object. Parameters Attribute. The port number that the LDAP server is listening to. The distinguished name of the base object that will be used for any subsequent operation. It can be used as a starting point for all operations. You cannot start any operation on a higher level than this DN! Password for the above user. If omitted it will result in an anonymous bind. If it is incorrect, the sampler will return an error and revert to an anonymous bind. If it is incorrect, the sampler will return an error. The current distinguished name of the object you want to rename or move, relative to the given DN in the thread bind operation. The new distinguished name of the object you want to rename or move, relative to the given DN in the thread bind operation. Distinguished name of the object you want to add, relative to the given DN in the thread bind operation. A list of attributes and their values you want to use for the object. If you need to add a multiple value attribute, you need to add the same attribute with their respective values several times to the list. Distinguished name of the object you want to delete, relative to the given DN in the thread bind operation. Distinguished name of the subtree you want your search to look in, relative to the given DN in the thread bind operation. Use 0 for baseobject-, 1 for onelevel- and 2 for a subtree search. Specify the maximum number of results you want back from the server. When the sampler hits the maximum number of results, it will fail with errorcode 4. Specify the maximum amount of cpu time in milliseconds that the server can spend on your search. Take care, this does not say anything about the response time. Specify the attributes you want to have returned, separated by a semicolon. An empty field will return all attributes. Whether the object will be returned true or not false. If true , the search results will be added to the response data. If false , a marker - whether results where found or not - will be added to the response data. Distinguished name of the object you want to modify, relative to the given DN in the thread bind operation. The attribute-value-opCode triples. If you don't specify a value with a delete operation, all values of the given attribute will be deleted. If you do specify a value in a delete operation, only the given value will be deleted. If this value is non-existent, the sampler will fail the test. The current distinguished name of the object of which you want to compare an attribute, relative to the given DN in the thread bind operation. Common log format looks like this: Everything else is stripped out and ignored. For example, the response code is completely ignored by the parser. The name is stored in the script variable Label. If this option is selected, then the interpreter will be recreated for each sample. This may be necessary for some long running scripts. For further information, see Best Practices - BeanShell scripting. Parameters to pass to the BeanShell script. This is intended for use with script files; for scripts defined in the GUI, you can use whatever variable and function references you need within the script itself. The parameters are stored in the following variables: Parameters string containing the parameters as a single variable bsh. A file containing the BeanShell script to run. The file name is stored in the script variable FileName. The BeanShell script to run. The return value if not null is stored as the sampler result. Each Sampler instance has its own BeanShell interpreter, and Samplers are only called from a single thread. JMeter processes function and variable references before passing the script field to the interpreter, so the references will only be resolved once. Variable and function references in script files will be passed verbatim to the interpreter, which is likely to cause a syntax error. In order to use runtime variables, please use the appropriate props methods, e. HMS" ; props. When using this feature, ensure your script code does not use JMeter variables or JMeter function calls directly in script code as caching would only cache first replacement. Instead use script parameters. To benefit from caching and compilation, the language engine used for scripting must implement JSR Compilable interface Groovy is one of these, java, beanshell and javascript are not. When using Groovy as scripting language and not checking Cache compiled script if available while caching is recommended , you should set this JVM Property -Dgroovy. Unlike the BeanShell Sampler , the interpreter is not saved between invocations. Name of the JSR scripting language to be used. There are other languages supported than those that appear in the drop-down list. Others may be available if the appropriate jar is installed in the JMeter lib directory. Notice that some languages such as Velocity may use a different syntax for JSR variables, e. Name of a file to be used as a JSR script, if a relative file path is used, then it will be relative to directory referenced by " user. List of parameters to be passed to the script file or the script. If checked advised and the language used supports Compilable interface Groovy is one of these, java, beanshell and javascript are not , JMeter will compile the Script and cache it using it's MD5 hash as unique cache key. The following properties can be used to control its operation: tcp. If not found, the class is then searched for in the package org. The following implementations are currently provided. When reading the response, it reads until the end of line byte, if this is defined by setting the property tcp. You can control charset encoding by setting tcp. When reading the response, it reads until the end of message byte, if this is defined by setting the property tcp. The length prefix defaults to 2 bytes. This can be changed by setting the property tcp. Timeout handling If the timeout is set, the read will be terminated when this expires. Response handling If tcp. If any such text is found, it is used to set the response code. The response message is then fetched from the properties file if provided. Name of the TCPClient class. Defaults to the property tcp. If selected, the connection is kept open. Otherwise it is closed when the data has been read.