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The JMeter FAQ

Table of Contents

How to do remote testing the 'proper way'?

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  1. Your application server. You shouldn't run anything on this machine that you wouldn't have running on it in your proposed or actual production environment (if you are running anything else, including JMeter, you will be adding load to the server and thus tainting your results).
  2. One or more machines running jmeter-server (the JMeterEngine). You want these machines to be reasonably close (network wise) to the application server. By "reasonably close" I mean on the same Ethernet segment or at least with no low speed links between them. The JMeter User Manual provides reasonable information about doing this.
  3. A single machine running the JMeter GUI that you use to control the machines running the JMeterEngine.

While you are developing your scripts and for only moderate levels of user testing (assuming you are "close" to the application server) you do not need to involve any JMeterEngine machines.
The reason you have these are to:

  1. Eliminate the impact of slow network connections when you are not "close" to the application server.
  2. Execute more test threads than your local machine is capable of handling.

Note that if the GUI is running multiple remote servers, it can easily become a bottle-neck, especially if a lot of listeners are being used. Remove all unnecessary listeners before running stress tests.

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How to run JMeter test plan programatically, such as from an Ant script?

Answer: Quick answer, go here: http://www.programmerplanet.org/ant-jmeter/. I have permission from the author of this ant task to add it to JMeter's distribution, which I will do as soon as I have the time. (It should now be in the extras folder).

How can I do stress testing of EJBs?

Answer: You can use the UserManual Reference/JavaSampler classes to write your own class that runs your EJB's, and then JMeter will take over the threading and reporting. This, however, is not ideal. Someone needs to write a good EJB Sampler implementation for JMeter (hint, hint).

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The following example parameterizes the pet category from the Java Pet Store. Thanks to jWebHosting.net for allowing us to run the example on their

  1. Install Petstore application on a local Tomcat server.
  2. Start JMeter
  3. Click the Add button to add the following user defined variables to the Test Plan node:
    1. server: www.jboss.jwebhosting.netlocalhost
    2. port: 808080
    3. protocol: http
  4. Add a Thread Group to the Test Plan setting:
    1. Number of Threads: 2
    2. Clear the forever checkbox
    3. Loop Count: 1
  5. Add Config Element > HTTP Cookie Manager to Thread Group
  6. Add Pre Processors > User Parameters to Thread Group
  7. Click Add User to add an additional user to the User Parameters
  8. Click Add Variable and set name to category, User_1 to DOGS and User_2 to FISH
  9. Add Sampler > HTTP Request to Thread Group with the following settings:
    1. Server Name or IP: ${server}
    2. Port Number: ${port}
    3. Protocol: ${protocol}
    4. Path: /estore/control/category
  10. Click the Add button to add a parameter to the request:
    1. Name: category_id
    2. Value: ${category}
  11. Add Listener > View Results Tree to Thread Group
  12. Save
  13. Run > Start

When you view the results in the View Results Tree, you can see the ${category} value was replaced with the value from the User Parameters. Each thread will use the category from the User Parameter setting automatically. If there are more than two threads, they will reuse the values in these settings, so the third thread would use DOGS.

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  1. Load Test Plan created in previous FAQ question
  2. Add Post Processor > Regular Expression Extractor to thread Group with following values:
    1. Reference Name: product
    2. Regular Expression: product_id=(\w*-\w*-\w*) 
    3. Template: $1$ 
    4. Match No.: 0  (Setting this parameter to 0 returns a random match)
  3. Copy the HTTP Request we created in the previous question and paste to the thread group after the previous HTTP Request
  4. Change the following values:
    1. Path: /estore/control/product 
    2. Add Parameter and set name to product_id , value to to ${product }
  5. Save Test Plan
  6. Run > Start

When you view the results in the View Results Tree, you can see the ${product} value was replaced with the value extracted by the regular expression.

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No Format
 ${__property(host1)}

and

No Format
 
 ${__property(host2)}

Note: Thread Groups are slightly different from other test elements, because their settings have to be determined before the test starts. This means that you cannot use variables defined in a User Parameters form. But the __property() function works in Thread Groups, and you can use variables defined on the Test Plan.

For example, you could define the TestPlan variable:

THREADS ${__P(threads,10) }

and then use{{ ${THREADS}}} in the ThreadGroup test element.

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It can be useful to put default settings into the jmeter property file, so you only need to supply differences on the command line.

No Format
 
 # defaults in jmeter.properties 
 group1.threads=10 
 group1.loops=100 
 group1.rampup=10

Then just do jmeter -Jgroup1.loops=1000 for example.

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How do I use external data files to define variables in my Test scripts?

*Answer:*The   The CSV Data Set Config element is the best way to do this, as it can create multiple variables from a single data file.

*Answer:*  Another way to do this is to create a User Parameters Pre-Processor in which you list all the values that you want to read from files. You can then use the variable names later in the script.

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I'm having difficulty getting JMeter to work with SSL (HTTPS). What's the problem?

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*Answer:* Check out the documentation [item 21.2.4|http://jakarta.apache.org/jmeter/usermanual/get-started.html]. _\[A lot of people struggle with this, either because of private certs or whatever - I'm looking for a page that details common trip-ups and solutions for them. - MikeStover\]_.

A lot of people struggle with this, either because of private certs or whatever - I'm looking for a page that details common trip-ups and solutions for them. – MikeStover



I'm having difficulty building Jmeter from NetBeans IDE. It is looking for a org.apache.log.Hierarchy, which log util is it looking for?

Answer: Make sure to mount all of the jars in the lib folder.

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Can JMeter record HTTPS requests using the recording proxy?

*Answer:*  Yes, in JMeter 2.4. JMeter now uses its own dummy certificate which the browser needs to be configured to accept.

How can I display the response text my assertation runs against?

*Answer:*  You can display your server's response text in the View Results Tree listener.

Is there a JMX Schema/DTD available?

*Answer:*  No. Don't plan on having one either at this point. Changes would be too frequent to realistically keep up with.

What happens with redirects when asserting HTTP responses?

*Answer:*  Assertions aren't smart enough to do the right thing with redirected requests - currently the 302 response would be asserted against. You can get around this by recording your test plans and leaving "follow redirects" off.

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I've set the CLASSPATH, but JMeter is not picking up my Jars

*Answer:*  The CLASSPATH variable is ignored when using the -jar flag. For some further information on this, see: How the Java launcher finds user classes

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What Pattern matching (regexen) does JMeter support?

*Answer:*  JMeter includes the pattern matching software Apache Jakarta ORO.

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Currently I am using WAS 5.0 Application Server . For “Monitor Results” , JMeter shows the example for TOMCAT 5.0 WebServer.

Info
title

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Followings from JMeter doc

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Add the HTTP Request to the Thread Group element (

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Add → Sampler → HTTP Request). Then, select the HTTP Request element in the tree and edit the following properties):

Change the Name field to "Server Status". Enter the IP address or Hostname Enter the port number Set the Path field to "/manager/status" if you're using Tomcat. Add a request parameter named "XML" in uppercase. Give it a value of "true" in lowercase. Check "Use as Monitor" at the bottom of the sampler

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Please let me know how I can set “Monitor Results” of JMeter in WAS5.0.

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You can uncomment those lines (remove # character) and restart jmeter :

No Format

# Save test plans and test logs in 2.0 format
#file_format=2.0
# Just test plans (jmx)
#file_format.testplan=2.0
# Just test logs (jtl)
#file_format.testlog=2.0

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How do I ensure each http request for jsp is within one jsessionid ?

Just insert a http cookie manager. It will automatically handle the session for all the request within the threadgroup treating it like one sessionan HTTP Cookie Manager. This keeps track of all cookies for each thread within the thread group. Without http cookie manager, each request is a new session as no session state is cookies are not kept. jsessionid is only shown for the very first request, subsequent request will not see the jsessionid. to use a variable in jmeter is ${name of variable}.

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