the exception is thrown when a signalEvent is called. The node id 8 is EventNode in the flowgraph. <eventNode id="8" name="Ukonceni PM" x="403" y="51" width="48" height="48" scope="internal" > <eventFilters> <eventFilter type="eventType" eventType="DECLINE" /> </eventFilters> </eventNode> Know somebody where is the problem ? Thanks Miloslav Vlach -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Weird-exception-unkno... Sent from the Drools - User mailing list archive at Nabble.com.