[jboss-jira] [JBoss JIRA] (JBRULES-3375) Adding ProcessEventListener throws NPE

[Mario Fusco (JIRA)]

Mario Fusco created JBRULES-3375:
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             Summary: Adding ProcessEventListener throws NPE
                 Key: JBRULES-3375
                 URL: https://issues.jboss.org/browse/JBRULES-3375
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
            Reporter: Mario Fusco
            Assignee: Mario Fusco


Description of problem:
When you try to add a ProcessEventListener to StatefulKnowledgeSession and you
are missing jBPM libraries on classpath, you get a NullPointerException.

Version-Release number of selected component (if applicable):
BRMS-5.3.0.dev5
Drools-5.3.0.Final

How reproducible:
Using attached reproducer.

Steps to Reproduce:
1. Make sure you don't have any jBPM libs on classpath
2. Create stateful session
3. Add ProcesEventListener (e.g. DebugProcessEventListener)

Actual results:
java.lang.NullPointerException
 at
org.drools.impl.StatefulKnowledgeSessionImpl.addEventListener(StatefulKnowledgeSessionImpl.java:199)
 at org.sample.TryProcessListener.main(TryProcessListener.java:20)

Expected results:
Either meaningful exception (like NojBPMException) or correct addition of
listener

Additional info:
It only affects StatefulKnowledgeSession, the StatefulKnowledgeSession runs
just fine.

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