[Bug 53277] HashTree can theoretically drop elements

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=53277

--- Comment #2 from Geert-Jan <ge...@ericsson.com> ---
Hi,

I think I just ran into this bug, proving it is not only theoretical. Th
exception I got looks like:

2012/06/19 14:56:30 ERROR - jmeter.JMeter: Error in NonGUIDriver
java.lang.NullPointerException
        at
org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:975)
        at
org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:975)
        at org.apache.jorphan.collections.HashTree.traverse(HashTree.java:959)
        at
org.apache.jmeter.engine.StandardJMeterEngine.configure(StandardJMeterEngine.java:176)
        at org.apache.jmeter.JMeter.runNonGui(JMeter.java:778)
        at org.apache.jmeter.JMeter.startNonGui(JMeter.java:716)
        at org.apache.jmeter.JMeter.start(JMeter.java:377)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.jmeter.NewDriver.main(NewDriver.java:216)

This was caused by two identical Include-Controllers on the main (and same)
level of a thread group. After I moved the second Include-Controller one level
up, as a child of a Simple Controller, the problem was solved. Not sure but it
can be related to the usage of HashMap. Just one funny remark, I only got this
NullPointerException when running jmeter with the -n option.

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