I do mean Eclipse. What do you mean by 'vanilla DRL'? It does seem to compile and run correctly when I deploy it. -- View this message in context: http://drools.46999.n3.nabble.com/Rule-not-compiling-in-IDE-after-migration-to-5-2-tp3183689p3183863.html Sent from the Drools: User forum mailing list archive at Nabble.com.