Same issue here (load ui agent 2.1.1 64 bit), observed when generating more than 200 requests per second (tried with Ramp and Fixed load generator):
Exception: java.lang.ArrayIndexOutOfBoundsException thrown from the UncaughtExceptionHandler in thread "Thread-17"
Although one of the agents spitted lots of messages stating that stale connection detected, nullpointerexception and this:
13:33:12,272 ERROR [SoapUI] An error occured [java.lang.NullPointerException], see error log for details
java.lang.IllegalStateException: No match found
at java.util.regex.Matcher.group(Unknown Source)
at com.eviware.soapui.support.GroovyUtils.extractErrorLineNumber(GroovyUtils.java:140)
at com.eviware.soapui.impl.wsdl.teststeps.WsdlGroovyScriptTestStep.run(WsdlGroovyScriptTestStep.java:172)
at com.eviware.soapui.impl.wsdl.support.AbstractTestCaseRunner.runTestStep(AbstractTestCaseRunner.java:238)
at com.eviware.soapui.impl.wsdl.testcase.WsdlTestCaseRunner.runCurrentTestStep(WsdlTestCaseRunner.java:48)
at com.eviware.soapui.impl.wsdl.support.AbstractTestCaseRunner.internalRun(AbstractTestCaseRunner.java:147)
at com.eviware.soapui.impl.wsdl.support.AbstractTestCaseRunner.internalRun(AbstractTestCaseRunner.java:42)
at com.eviware.soapui.impl.wsdl.support.AbstractTestRunner.run(AbstractTestRunner.java:135)
at com.eviware.loadui.components.soapui.SoapUISamplerComponent$SoapUITestCaseRunner.run(SoapUISamplerComponent.java:735)
at com.eviware.loadui.components.soapui.SoapUISamplerComponent.sample(SoapUISamplerComponent.java:577)
at com.eviware.loadui.impl.component.categories.RunnerBase.doSample(RunnerBase.java:507)
at com.eviware.loadui.impl.component.categories.RunnerBase.access$700(RunnerBase.java:68)
at com.eviware.loadui.impl.component.categories.RunnerBase$Worker.run(RunnerBase.java:774)
at com.eviware.loadui.util.dispatch.CustomThreadPoolExecutor$Worker.run(CustomThreadPoolExecutor.java:198)
at java.lang.Thread.run(Unknown Source)
Both agents are 8-core machines with 16GB of Ram (ubuntu 12.04.2 LTS) (resources are still plentiful when load ui hangs)
Under lower load such situation didn't occur during test which lasted 1 hour, with high load less than 10 minutes guarantees such errors.
