>From the trace, it looks like you need to add the source jars. Maybe you are trying to debug and when stepping into a method you are getting this? -- View this message in context: http://drools.46999.n3.nabble.com/Drools-Guvnor-Integration-tp4025641p4025649.html Sent from the Drools: User forum mailing list archive at Nabble.com.