Re: [rules-users] Drools 5.4 Jitting Error

In Drools 5.4 we added an optimization that JITs constraints (i.e. compile them in bytecode) after they have been evaluated for a given amount of times (currently 20). Moreover it is not true that constraints' evaluations is made in threads different from the main one. Instead it is that jitting process mentioned above that is performed in a different threads, so until the optimized version of the constraint isn't ready, the main thread isn't blocked but can continue to use the non-jitted one. The error you are experiencing is generated during the optimization process and that is why you see it happens in different thread. I will try to reproduce the issue you found just now. Thank you for reporting this. Mario