Several random MVEL related errors while using drools. ------------------------------------------------------ Key: JBRULES-2246 URL: https://jira.jboss.org/jira/browse/JBRULES-2246 Project: Drools Issue Type: Bug Security Level: Public (Everyone can see) Affects Versions: 4.0.7 Environment: Unix Reporter: Rajesh Nair Assignee: Mark Proctor We are getting several MVEL related exceptions while running a batch program that is multi-threaded. Sometimes the bean name gets corrupted and it complains about ClassNotFoundException. Sometimes, it complains that a specific property is not found. When we restart the batch program, the problem goes away. Is there a way to fix this? We are using JDK 1.5 and the mvel jar version is mvel-1.3.1-java1.4.jar. If this jar will not work with drools 4.0.7, please suggest the upgrade path. In the worst case, we can use Java dialect. However, all our rules are created via the BRMS. So, how do you force the BRMS to use Java dialect? Thanks, Rajesh Here is a sample stacktrace. rg.drools.RuntimeDroolsException: Exception executing predicate eval( (field1 + field2 + field3) <= 0 ) at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:216) at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:162) at org.drools.reteoo.Rete.assertObject(Rete.java:175) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192) at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:911) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:883) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684) at org.drools.reteoo.ReteooStatelessSession.executeWithResults(ReteooStatelessSession.java:198) at walgreens.pbs.ruleengine.worker.RulesetExecutor.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690) at java.lang.Thread.run(Thread.java:803) Caused by: org.mvel.PropertyAccessException: unable to resolve property: field2 (where field2 is the name of the property) at org.mvel.optimizers.impl.asm.ASMAccessorOptimizer.compileAccessor(ASMAccessorOptimizer.java:267) at org.mvel.optimizers.impl.asm.ASMAccessorOptimizer.optimizeAccessor(ASMAccessorOptimizer.java:163) at org.mvel.ASTNode.getReducedValueAccelerated(ASTNode.java:186) at org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21) at org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21) at org.mvel.ExecutableAccessor.getValue(ExecutableAccessor.java:45) at org.mvel.ast.Substatement.getReducedValueAccelerated(Substatement.java:24) at org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21) at org.mvel.MVELRuntime.execute(MVELRuntime.java:90) at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111) at org.mvel.MVEL.executeExpression(MVEL.java:235) at org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:45) at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:209) ... 14 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:615) at org.mvel.optimizers.impl.asm.ASMAccessorOptimizer.loadClass(ASMAccessorOptimizer.java:1003) at org.mvel.optimizers.impl.asm.ASMAccessorOptimizer._initializeAccessor(ASMAccessorOptimizer.java:206) at org.mvel.optimizers.impl.asm.ASMAccessorOptimizer.compileAccessor(ASMAccessorOptimizer.java:264) ... 26 more Caused by: java.lang.LinkageError: ASMAccessorImpl_19543133401249413540370 at java.lang.ClassLoader.defineClassImpl(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:223) at java.lang.ClassLoader.defineClass(ClassLoader.java:162) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira