[jboss-jira] [JBoss JIRA] (JBRULES-3287) Registering a SystemEventListener for a change set scanner does 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=12641687#comment-12641687 ] 

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

Geoffrey De Smet <gdesmet at redhat.com> made a comment on [bug 741219|https://bugzilla.redhat.com/show_bug.cgi?id=741219]

I tried simplifying the testcase while making sure it fails if the scanner-thread throws an exception, but JBRULES-3287 prevented me from doing so.
                
> Registering a SystemEventListener for a change set scanner does 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
>         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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