Bug 60428

Summary: JMeter Backend Listener show exception when test ended
Product: JMeter Reporter: Liu XP <liu_xp2003>
Component: MainAssignee: JMeter issues mailing list <issues>
Severity: regression    
Priority: P2    
Version: 3.1   
Target Milestone: ---   
Hardware: All   
OS: All   

Description Liu XP 2016-11-29 03:13:14 UTC
1. Create JMeter test script with default Backend Listener.
2. Set correct graphiteHost,graphitePort,rootMetricsPrefix and samplersList.
3. Change useRegexpForSamplersList to true.
4. Run the test script.

We can see exception like below:
2016/11/29 11:01:19 WARN  - jmeter.engine.StandardJMeterEngine: Error encountered during shutdown of org.apache.jmeter.visualizers.backend.BackendListener@2b1f1961 java.lang.IllegalStateException: Failed calling teardownTest
	at org.apache.jmeter.visualizers.backend.BackendListener.testEnded(BackendListener.java:384)
	at org.apache.jmeter.visualizers.backend.BackendListener.testEnded(BackendListener.java:392)
	at org.apache.jmeter.engine.StandardJMeterEngine.notifyTestListenersOfEnd(StandardJMeterEngine.java:216)
	at org.apache.jmeter.engine.StandardJMeterEngine.run(StandardJMeterEngine.java:437)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at org.apache.jmeter.visualizers.backend.graphite.GraphiteBackendListenerClient.teardownTest(GraphiteBackendListenerClient.java:327)
	at org.apache.jmeter.visualizers.backend.BackendListener.testEnded(BackendListener.java:382)
	... 4 more

This is issue should be bring with the Bug 59099 fixed at 9 month ago.
Bug 59099 - Backend listener : Add the possibility to consider samplersList as a Regular Expression

I fixed this issue by changing code temporary. org.apache.jmeter.visualizers.backend.graphite.GraphiteBackendListenerClient
move line 304 "samplersToFilter = new HashSet<>();" after line 301
Comment 1 Liu XP 2016-11-29 03:16:47 UTC
Move line 304 "samplersToFilter = new HashSet<>();" after line 299
Comment 2 Felix Schumacher 2016-11-29 20:12:25 UTC
Thanks for your contribution. 

I chose a slightly different approach by checking for null instead of initialising the collection, though.

Date: Tue Nov 29 20:10:27 2016
New Revision: 1771952

URL: http://svn.apache.org/viewvc?rev=1771952&view=rev
JMeter Graphite Backend Listener throws exception when test ends
and useRegexpForSamplersList is set to true.
Based on patch by Liu XP (liu_xp2003 at sina.com)

Bugzilla Id: 60428