I didn't work with WorkingMemoryFileLogger because it's incomplete class I imlement all interfaces (AgendaEventListener, WorkingMemoryEventListener,...) and I used log4j to log all events (it's more clear) and everytime I have a session to create I add all listener: exemple public class AgendaEventListenerImpl implements AgendaEventListener{ /*I initialize a log4j and implement all methods*/ } in main class: session.addEventListener(new AgendaEventListenerImpl()); session.fireAllRules(); keep me in informed Regards -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Append-the-Logs-For-t... Sent from the Drools - Dev mailing list archive at Nabble.com.