Encountering org/openqa/selenium/remote/SessionNotFoundException error while executing JMeter tests in Jenkins

Recently, I encountered an issue when trying to run web app JMeter tests using the Firefox Driver in Jenkins.

I was able to successfully execute the tests in non-GUI mode on the terminal of the Jenkins server. I could also run the tests successfully on the Jenkins server with the JMeter UI. But when I triggered it through a Jenkins job, it threw the following error:

jmeter -n -t jmeter.jmx -l result.jtl 

Writing log file to: /var/lib/jenkins/workspace/test/srm-bermuda/jmeter.log
Error in NonGUIDriver java.lang.IllegalArgumentException: Problem loading XML from:'/var/lib/jenkins/workspace/test/srm-bermuda/jmeter.jmx', missing class com.thoughtworks.xstream.converters.ConversionException: org/openqa/selenium/remote/SessionNotFoundException : org/openqa/selenium/remote/SessionNotFoundException
---- Debugging information ----
message             : org/openqa/selenium/remote/SessionNotFoundException
cause-exception     : java.lang.NoClassDefFoundError
cause-message       : org/openqa/selenium/remote/SessionNotFoundException
first-jmeter-class  : org.apache.jmeter.save.converters.TestElementConverter.unmarshal(TestElementConverter.java:100)
class               : org.apache.jmeter.save.ScriptWrapper
required-type       : com.googlecode.jmeter.plugins.webdriver.config.FirefoxDriverConfig
converter-type      : org.apache.jmeter.save.ScriptWrapperConverter
path                : /jmeterTestPlan/hashTree/hashTree/hashTree/com.googlecode.jmeter.plugins.webdriver.config.FirefoxDriverConfig
line number         : 29
version             : 3.0 r1743807

If anyone has a solution, I would greatly appreciate the help!

Here is the full Jenkins log containing the details printed out by the jmeter.log as well:

+ cd srm-bermuda
+ ls
jmeter.jmx
jmeter.log
jmeter_UI.jmx
simple.jmx
success_login.jmx
test.har
+ result=result.jtl
+ [ -f result.jtl ]
+ rm -rf dashboard
+ export     PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/var/lib/jenkins/.rvm/bin:/data/jre1.7.0_79/bin:/data/apache-jmeter-3.0/bin:/data/apache-jmeter-3.0/lib:/data/apache-jmeter-3.0/lib/ext
+ jmeter -n -t jmeter_UI.jmx -l result.jtl -H cn-proxy.jp.oracle.com -P 80
Writing log file to: /var/lib/jenkins/workspace/test/srm-bermuda/jmeter.log
Error in NonGUIDriver java.lang.IllegalArgumentException: Problem loading     XML from:'/var/lib/jenkins/workspace/test/srm-bermuda/jmeter_UI.jmx', missing     class com.thoughtworks.xstream.converters.ConversionException:     org/openqa/selenium/WebDriverException : org/openqa/selenium/WebDriverException
---- Debugging information ----
message             : org/openqa/selenium/WebDriverException
cause-exception     : java.lang.NoClassDefFoundError
cause-message       : org/openqa/selenium/WebDriverException
first-jmeter-class  : org.apache.jmeter.save.converters.TestElementConverter.unmarshal(TestElementConverter.java:100)
class               : org.apache.jmeter.save.ScriptWrapper
required-type       : com.googlecode.jmeter.plugins.webdriver.config.FirefoxDriverConfig
converter-type      : org.apache.jmeter.save.ScriptWrapperConverter
path                : /jmeterTestPlan/hashTree/hashTree/hashTree/com.googlecode.jmeter.plugins.webdriv    er.config.FirefoxDriverConfig
line number         : 29
version             : 3.0 r1743807
-------------------------------
+ cat jmeter.log
2016/11/24 16:12:16 INFO  - jmeter.util.JMeterUtils: Setting Locale to en_US 
(continue with the rest of the log...)
seleniumjenkinsjmeterjmeter-plugins

Answer №1

Encountering a "NoClassDefFoundError" error typically signifies that the required .jar file containing the class is not in the Java Classpath, or specifically in the JMeter Classpath. In the case of JMeter Plugins, it is common for individuals to place plugin libraries in the "lib/ext" folder without also installing dependencies into the "lib" folder within their JMeter installations. This may be the cause of your issue as well. To address this problem, I suggest considering two options:

  1. Compare the contents of the "lib" and "lib/ext" folders in your JMeter installations on:

    • a machine where the test runs successfully
    • the Jenkins build agent

    Make any necessary adjustments to ensure both folders are identical.

  2. The preferred method for installing and keeping JMeter Plugins up-to-date is by using the JMeter Plugins Manager. This allows you to obtain a clean distribution of the latest version of JMeter and easily install all required plugins using the Plugins Manager tool.

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