Jitting process may randomly fail during multithreaded execution ---------------------------------------------------------------- Key: DROOLS-1710 URL: https://issues.jboss.org/browse/DROOLS-1710 Project: Drools Issue Type: Bug Components: core engine Reporter: Mario Fusco Assignee: Mario Fusco Labels: jitting Fix For: 7.3.0.Final The jitting process assumes that the mvel constraint has been evaluated at least once before it kicks in. This may not be the case during a multithreaded execution (especially when running with many threads and a very low jitting threshold) because the jitting process may start when other threads have already requested the constraint evaluation using the mvel interpreted constraint (thus incrementing the jitting counter) but none of them had enough time to complete it. When this happens the jitting process trying to work on an uncompleted AST throwing internally an exception like the following: {code} Exception in thread "drools-worker-1" java.lang.RuntimeException: java.lang.RuntimeException: Null accessor on node: firings at org.drools.core.rule.constraint.MvelConstraint.executeJitting(MvelConstraint.java:346) at org.drools.core.rule.constraint.MvelConstraint.access$200(MvelConstraint.java:82) at org.drools.core.rule.constraint.MvelConstraint$ConditionJitter.run(MvelConstraint.java:313) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.RuntimeException: Null accessor on node: firings at org.drools.core.rule.constraint.ConditionAnalyzer.analyzeNode(ConditionAnalyzer.java:302) at org.drools.core.rule.constraint.ConditionAnalyzer.analyzeSingleCondition(ConditionAnalyzer.java:159) at org.drools.core.rule.constraint.ConditionAnalyzer.analyzeCondition(ConditionAnalyzer.java:138) at org.drools.core.rule.constraint.ConditionAnalyzer.analyzeCondition(ConditionAnalyzer.java:109) at org.drools.core.rule.constraint.MvelConditionEvaluator.getAnalyzedCondition(MvelConditionEvaluator.java:129) at org.drools.core.rule.constraint.MvelConstraint.executeJitting(MvelConstraint.java:333) ... 5 more {code}