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Posted to jmeter-dev@jakarta.apache.org by bu...@apache.org on 2009/08/05 12:24:59 UTC
DO NOT REPLY [Bug 47646] New: NullPointerException in the "Random
Variable" element
https://issues.apache.org/bugzilla/show_bug.cgi?id=47646
Summary: NullPointerException in the "Random Variable" element
Product: JMeter
Version: 2.3.4
Platform: All
OS/Version: All
Status: NEW
Severity: major
Priority: P2
Component: Main
AssignedTo: jmeter-dev@jakarta.apache.org
ReportedBy: mparreno@hp-cda.com
--- Comment #0 from Miguel Parreño <mp...@hp-cda.com> 2009-08-05 03:24:57 PDT ---
In a "Random Variable" element set true the "Per Thread(User)" option, and
launch test plan in distributed mode (Remote Start).
ERROR - jmeter.threads.JMeterThread: Test failed!
java.lang.NullPointerException
at
org.apache.jmeter.config.RandomVariableConfig.iterationStart(RandomVariableConfig.java:90)
at
org.apache.jmeter.control.GenericController.fireIterationStart(GenericController.java:318)
at
org.apache.jmeter.control.GenericController.fireIterEvents(GenericController.java:308)
at
org.apache.jmeter.control.GenericController.next(GenericController.java:128)
at
org.apache.jmeter.control.GenericController.nextIsAController(GenericController.java:182)
at
org.apache.jmeter.control.GenericController.next(GenericController.java:146)
at
org.apache.jmeter.control.GenericController.nextIsAController(GenericController.java:185)
at
org.apache.jmeter.control.GenericController.next(GenericController.java:146)
at
org.apache.jmeter.control.GenericController.nextIsAController(GenericController.java:182)
at
org.apache.jmeter.control.GenericController.next(GenericController.java:146)
at
org.apache.jmeter.control.GenericController.nextIsAController(GenericController.java:182)
at
org.apache.jmeter.control.GenericController.next(GenericController.java:146)
at org.apache.jmeter.control.LoopController.next(LoopController.java:109)
at org.apache.jmeter.threads.ThreadGroup.next(ThreadGroup.java:129)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:242)
at java.lang.Thread.run(Unknown Source)
The method:
public void iterationStart(LoopIterationEvent iterEvent) {
Random randGen=null;
if (getPerThread()){
randGen = (Random) perThreadRandom.get(); <------ At line
90, the perThreadRandom object IS NULL.
} else {
synchronized(this){
if (globalRandom == null){
init();
globalRandom = new Random(getRandomSeedAsLong());
}
randGen=globalRandom;
}
}
if (n <=0){
return;
}
long nextRand = minimum + randGen.nextInt(n);
// Cannot use getThreadContext() as we are not cloned per thread
JMeterVariables variables =
JMeterContextService.getContext().getVariables();
variables.put(getVariableName(), formatNumber(nextRand));
}
The declaration:
private transient ThreadLocal perThreadRandom = new ThreadLocal() {
protected Object initialValue() {
init();
return new Random(getRandomSeedAsLong());
}};
¿Why transient? Javadoc says that ThreadLocal instances are typically private
static fields in classes that wish to associate state with a thread. However,
in this case not in possible, because init() and getRandomSeedAsLong() are
non-static methods in the class. I comment out these calls, set static the
declaration and work fine.
References: http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ThreadLocal.html
I use: java version "1.6.0_14"
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DO NOT REPLY [Bug 47646] NullPointerException in the "Random
Variable" element
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=47646
Sebb <se...@apache.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #2 from Sebb <se...@apache.org> 2009-09-17 03:41:53 PDT ---
Resolved in SVN; code is in builds after (and including) r801478
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DO NOT REPLY [Bug 47646] NullPointerException in the "Random
Variable" element
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=47646
froutier@cofisun.com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |froutier@cofisun.com
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DO NOT REPLY [Bug 47646] NullPointerException in the "Random
Variable" element
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=47646
--- Comment #1 from Sebb <se...@apache.org> 2009-08-05 17:32:32 PDT ---
Thanks for the report.
The perThreadRandom field cannot be static.
There may be several instances of the Random Config element and each one needs
its own PRNG.
The field must be transient for the same reason.
Solution is to use readResolve() to create the field.
URL: http://svn.apache.org/viewvc?rev=801478&view=rev
Log:
Bug 47646 - NullPointerException in the "Random Variable" element
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