KnowledgeBase's ruleBase is never unlocked when an exception is thrown by executed rules ---------------------------------------------------------------------------------------- Key: DROOLS-497 URL: https://issues.jboss.org/browse/DROOLS-497 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 5.6.0.Final Reporter: Antonio Ruberto Assignee: Mark Proctor Attachments: drool-497.zip We have a KnowledgeBase that is built application start up from which we constantly create new KnowledgeSession from. If the execution of one of those sessions throws an exception (i.e. one of the rules in the KnowledgeBase throws an exception for some reason), any subsequent KnowledgeSessions that are created and executed get dead locked. The issue stems from the initInitialFact() method in AbstractWorkingMemory.java as seen below. An exception thrown by the underlying rule causes ruleBase.unlock() to never be reached. {code} public void initInitialFact( InternalRuleBase ruleBase, MarshallerReaderContext context ) { ruleBase.lock(); Object initialFact = InitialFactImpl.getInstance(); ObjectTypeConf otc = this.defaultEntryPoint.getObjectTypeConfigurationRegistry() .getObjectTypeConf( this.defaultEntryPoint.entryPoint, initialFact ); this.initialFactHandle = ruleBase.getConfiguration().getComponentFactory().getFactHandleFactoryService().newFactHandle( 0, initialFact, 0, otc, this, this.defaultEntryPoint ); final PropagationContext pctx = new PropagationContextImpl( 0, PropagationContext.ASSERTION, null, null , initialFactHandle, 0, 0, defaultEntryPoint.getEntryPoint(), context ); otc.getConcreteObjectTypeNode().assertObject( this.initialFactHandle, pctx, this ); // ADDED, NOT IN THE ORIGINAL 6.x COMMIT pctx.evaluateActionQueue( this ); ruleBase.unlock(); } {code}