Registering a SystemEventListener for a change set scanner does not seem to work. Therefor it's not possible to detect exceptions during scanning.

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).

        FailureDetectingSystemEventListener systemEventListener = new FailureDetectingSystemEventListener();
        SystemEventListenerFactory.setSystemEventListener(systemEventListener);

However, when I tried registering this on the agent:

            KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("csv agent");
            kagent.setSystemEventListener(systemEventListener);

It didn't work, the DoNothingSEL was still used.

When I tried on the SystemEventListenerFactory:

        SystemEventListenerFactory.setSystemEventListener(systemEventListener);

a StackOverflowException occurs, because ProcessChangeSet.listener is a DelegatingSEL pointing to itself.