I am testing an application using Fusion with Cucumber. I create a knowledge session with the pseudo clock such that I have control over how the clock advances. I insert events built from Cucumber data tables with a loop that also advances the pseudo clock the approriate amount of time. Some of my scenarios involve complex events being inserted and then retracted before an external action is taken. From what I read I can use a LiveQuery and a ViewChangeEventListener in my tests for running my assertions at the end of the test case. In my test case, the warnings list is always 0 in length, none of the log messages get triggered, and the debug view of the LiveQueryImpl is mostly uninteresting. I can see from the Audit log however that in this case there was indeed a Warning object added and thus I believe rowAdded should have been invocated. I have the following query: query "Collect Warnings" $warnings : Warning() end And the following support code in the @Setup method of my cucumber step definitions: // parts have been truncated for relevance and possibly brevity private LiveQuery query; // this is declared as a variable private List<Warning> warnings = new ArrayList<Warning>(); @Before public void setup() { session = getKnowledgeSession(); // truncated for brevity ViewChangedEventListener listener = new ViewChangedEventListener() { public void rowUpdated( Row row ) { logger.info( "rowUpdated" ); warnings.add( (Warning) row.get( "$warnings" ) ); } public void rowRemoved( Row row ) { logger.info( "rowRemoved" ); warnings.add( (Warning) row.get( "$warnings" ) ); } public void rowAdded( Row row ) { logger.info( "rowAdded" ); warnings.add( (Warning) row.get( "$warnings" ) ); } }; // Open the LiveQuery query = application.getKnowledgeSession().openLiveQuery( "Collect Warnings", new Object[] { "$warnings" }, listener ); } -- View this message in context: http://drools.46999.n3.nabble.com/Cannot-use-ViewChangeEventListener-in-t... Sent from the Drools: User forum mailing list archive at Nabble.com.