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http://issues.apache.org/bugzilla/show_bug.cgi?id=44222

           Summary: Concurent modification exceptions (server mode)
           Product: JMeter
           Version: 2.3.1
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTTP
        AssignedTo: [email protected]
        ReportedBy: [EMAIL PROTECTED]


I have several JMeter servers and simple plan like the following:
+Test thread
++JavaRequest title: {__machineName(machine)}

Sometimes several servers couldn't start test plans. The following exceptions
occurred:

Client stacktrace:
-----------------
Exception in thread "Thread-8" java.util.ConcurrentModificationException
        at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(Unknown Source)
        at java.util.LinkedHashMap$ValueIterator.next(Unknown Source)
        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.traverse(HashTree.java:956)
        at
org.apache.jmeter.engine.ClientJMeterEngine.run(ClientJMeterEngine.java:116)
        at java.lang.Thread.run(Unknown Source)


Server stacktrace:
------------------
2008/01/14 14:01:51 ERROR - jmeter.engine.StandardJMeterEngine: Error occurred
compiling the tree: java.util.Concurrent
ModificationException
at java.util.LinkedList$ListItr.checkForComodification(Unknown Source)
at java.util.LinkedList$ListItr.next(Unknown Source)
at org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:971)
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.StandardJMeterEngine.compileTree(StandardJMeterEngine.java:182)
at 
org.apache.jmeter.engine.StandardJMeterEngine.run(StandardJMeterEngine.java:344)
at java.lang.Thread.run(Unknown Source)

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