Drools freezes during execution ------------------------------- Key: DROOLS-81 URL: https://issues.jboss.org/browse/DROOLS-81 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 5.5 Reporter: Andrew kelly Assignee: Mario Fusco When Drools is being run to process rules on a number of threads on occasion the rules engine freezes with the stack trace below and does not complete. There are a number of other threads that are also frozen out waiting to lock 0x00002aab9d4caf58: Frozen Thread "pool-3-thread-8" prio=10 tid=0x00002ab53d16e000 nid=0x1c29 runnable [0x0000000049fc7000] java.lang.Thread.State: RUNNABLE at java.util.WeakHashMap.expungeStaleEntries(WeakHashMap.java:408) - locked \<0x00002aab9d4caf58\> (a java.lang.ref.ReferenceQueue) at java.util.WeakHashMap.getTable(WeakHashMap.java:417) at java.util.WeakHashMap.get(WeakHashMap.java:464) at org.mvel2.util.ParseTools.getBestCandidate(ParseTools.java:241) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:1039) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:987) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:377) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:143) at org.mvel2.ast.ASTNode.optimize(ASTNode.java:159) at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:115) at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85) at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:113) at org.mvel2.MVEL.executeExpression(MVEL.java:930) at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:104) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287) - locked \<0x00002aaec5b1b160\> (a org.drools.common.DefaultAgenda) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674) at com.iontrading.arc.liquidityrules.engine.BatchRulesEngine.processAll(BatchRulesEngine.java:64) at com.iontrading.arc.liquidityrules.api.rulestoresource.AbstractRuleStoreSourceService.performBaselineProcessing(AbstractRuleStoreSourceService.java:860) at com.rbc.erm.rulestoresource.RuleStoreSourceService.access$600(RuleStoreSourceService.java:32) at com.rbc.erm.rulestoresource.RuleStoreSourceService$RuleStoreProcess.call(RuleStoreSourceService.java:66) at com.rbc.erm.rulestoresource.RuleStoreSourceService$RuleStoreProcess.call(RuleStoreSourceService.java:38) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722) Example of other frozen threads: "pool-3-thread-9" prio=10 tid=0x00002ab53d16f800 nid=0x1c2a waiting for monitor entry [0x000000004a0c9000] java.lang.Thread.State: BLOCKED (on object monitor) at java.util.WeakHashMap.expungeStaleEntries(WeakHashMap.java:386) - waiting to lock \<0x00002aab9d4caf58\> (a java.lang.ref.ReferenceQueue) at java.util.WeakHashMap.getTable(WeakHashMap.java:417) at java.util.WeakHashMap.get(WeakHashMap.java:464) at org.mvel2.util.ParseTools.getBestCandidate(ParseTools.java:241) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:1039) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:987) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:377) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:143) at org.mvel2.ast.ASTNode.optimize(ASTNode.java:159) at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:115) at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85) at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:113) at org.mvel2.MVEL.executeExpression(MVEL.java:930) at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:104) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287) - locked \<0x00002aaeedca2870\> (a org.drools.common.DefaultAgenda) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674) at com.iontrading.arc.liquidityrules.engine.BatchRulesEngine.processAll(BatchRulesEngine.java:64) at com.rbc.erm.rulestoresource.RuleStoreSourceService.performViewProcessing(RuleStoreSourceService.java:133) at com.rbc.erm.rulestoresource.RuleStoreSourceService$RuleStoreProcess.call(RuleStoreSourceService.java:78) at com.rbc.erm.rulestoresource.RuleStoreSourceService$RuleStoreProcess.call(RuleStoreSourceService.java:38) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722)