Hello, Yesterday I wanted to upgrade my drools version to 5.3 (from 5.1). I got the exception "java.lang.NoClassDefFoundError: de/pelle7/testpackage/event/myEvent (wrong name: de/pelle7/testpackage/event/MyEvent)" while adding my resources. I removed the import wildcards and the error disappeard. Finally I found the problem: I used the patternBinding 'myEvent' and there is a class called 'MyEvent' and I used an wildcard import where the class 'MyEvent' is located. Example code: " package de.pelle7.testrules.impl.drools import de.pelle7.testpackage.event.* rule "Test rule 1" dialect "java" salience 50 when myEvent : MyEvent( ) myEvent2 : MyEvent( data == myEvent.data ) <-- here the Exception is thrown then System.err.println("Output"); end " My solution is that I replaced all my pattern bindings with the suffix '$' which is more convenient. Perhaps it would be nice to produce an rule-compilation error. with a line notice. Regard, Per Sterner _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users