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http://issues.apache.org/bugzilla/show_bug.cgi?id=44126

           Summary: ConcurrentModificationException executing test on
                    multiple machines
           Product: JMeter
           Version: 2.3.1
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Main
        AssignedTo: [email protected]
        ReportedBy: [EMAIL PROTECTED]


I have a single, simple test with one thread group (2 threads, ramp up time 1,
loop 1). The thread group contains 3 HTTP requests (1 POST that sends contents
of a small file and 2 GETs) and one View Results Tree listener.  In
jmeter.properties: mode=Batch, num_sample_threshold=1000, and
time_threshold=60000.  Only other modifications to jmeter.properties:
jmeter.laf=javax.com.sun.java.swing.plaf.windows.WindowsLookAndFeel and 6
remote_hosts defined.  From the master GUI, I call Run->Remote Start All and I 
get:

Exception in thread "Thread-4" java.util.ConcurrentModificationException
  at 
java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:365)
  at java.util.LinkedHashMap$ValueIterator.next(LinkedHashMap.java:380)
  at
org.apache.jmeter.testelement.property.PropertyIteratorImpl.next(PropertyIteratorImpl.java:50)
  at
org.apache.jmeter.engine.util.ValueReplacer.replaceValues(ValueReplacer.java:113)
  at
org.apache.jmeter.engine.util.ValueReplacer.replaceValues(ValueReplacer.java:65)
  at org.apache.jmeter.engine.PreCompiler.addNode(PreCompiler.java:70)
  at org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:972)
  at org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:973)
  at org.apache.jorphan.collections.HashTree.traverse(HashTree.java:956)
  at 
org.apache.jmeter.engine.ClientJMeterEngine.run(ClientJMeterEngine.java:116)
  at java.lang.Thread.run(Thread.java:595)

The error also occurs with mode=Statistical and with the Summary Report
listener.  I didn't see this error as often with fewer remote hosts.

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