[jboss-jira] [JBoss JIRA] (JBRULES-3287) Registering a SystemEventListener for a change set scanner does not seem to work. Therefor it's not possible to detect exceptions during scanning.

[RH Bugzilla Integration (Commented) (JIRA)]

    [ https://issues.jboss.org/browse/JBRULES-3287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654262#comment-12654262 ] 

RH Bugzilla Integration commented on JBRULES-3287:
--------------------------------------------------

Jiri Svitak <jsvitak at redhat.com> made a comment on [bug 733008|https://bugzilla.redhat.com/show_bug.cgi?id=733008]

manstis: It seems that this is not identical issue, because fixing bug https://issues.jboss.org/browse/GUVNOR-1699
did not solve this problem. I have added link to external issues
https://issues.jboss.org/browse/JBRULES-3282
https://issues.jboss.org/browse/JBRULES-3287
which were created by Geoffrey De Smet. He tried to solve them, but there is a deeper problem which should be solved by someone else who works on engine. Just for information the same problem appears for other types of resources, like XLS, CSV, BPMN and he wrote some comments on XLS scanning issue:
https://bugzilla.redhat.com/show_bug.cgi?id=741219
                
> Registering a SystemEventListener for a change set scanner does not seem to work. Therefor it's not possible to detect exceptions during scanning.
> --------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JBRULES-3287
>                 URL: https://issues.jboss.org/browse/JBRULES-3287
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>            Reporter: Geoffrey De Smet
>            Assignee: Mark Proctor
>            Priority: Minor
>         Attachments: JBRULES-3287.patch
>
>
> I wrote a FailureDetectingSystemEventListener to retain the exceptions throw in the scanner, so I can fail my testcase if there are any exception is the off-threads of a testcase that should fail the test case (but currently don't).
> {code}
>         FailureDetectingSystemEventListener systemEventListener = new FailureDetectingSystemEventListener();
>         SystemEventListenerFactory.setSystemEventListener(systemEventListener);
> {code}
> However, when I tried registering this on the agent:
> {code}
>             KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("csv agent");
>             kagent.setSystemEventListener(systemEventListener);
> {code}
> It didn't work, the DoNothingSEL was still used.
> When I tried on the SystemEventListenerFactory:
> {code}
>         SystemEventListenerFactory.setSystemEventListener(systemEventListener);
> {code}
> a StackOverflowException occurs, because ProcessChangeSet.listener is a DelegatingSEL pointing to itself.

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