[jboss-jira] [JBoss JIRA] (DROOLS-1383) Deadlock in PackageClassLoader

Deadlock in PackageClassLoader ------------------------------ Key: DROOLS-1383 URL: https://issues.jboss.org/browse/DROOLS-1383 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 6.4.0.Final Reporter: Karen Zhu Assignee: Mario Fusco Priority: Blocker Found one deadlock in PackageLoader. Did I write rule in a bad way? How did a consequence of a rule will get the lock of PackageLoader which is needed by checkCerts(). Below is threaddump information. Found one Java-level deadlock: ============================= "Thread-105-CustomClass-executor[17 17]": waiting to lock monitor 0x00007f933c005b38 (object 0x00007f963ed294b0, a java.lang.Object), which is held by "Thread-17-CustomClass-executor[33 33]" "Thread-17-CustomClass-executor[33 33]": waiting to lock monitor 0x00007f933c0031f8 (object 0x00007f963ed294c0, a org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader), which is held by "Thread-33-CustomClass-executor[9 9]" "Thread-33-CustomClass-executor[9 9]": waiting to lock monitor 0x00007f933c005b38 (object 0x00007f963ed294b0, a java.lang.Object), which is held by "Thread-17-CustomClass-executor[33 33]" Java stack information for the threads listed above: =================================================== "Thread-105-CustomClass-executor[17 17]": at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:662) waiting to lock <0x00007f963ed294b0> (a java.lang.Object) at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.loadClass(JavaDialectRuntimeData.java:642) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at org.drools.core.rule.MVELDialectRuntimeData.getParserConfiguration(MVELDialectRuntimeData.java:299) at org.drools.core.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238) at org.drools.core.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:264) at org.drools.core.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:248) at org.drools.core.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:214) at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:131) at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:63) at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:366) at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:300) at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:73) at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2017) at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1334) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288) at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278) "Thread-17-CustomClass-executor[33 33]": at java.lang.ClassLoader.checkCerts(ClassLoader.java:942) waiting to lock <0x00007f963ed294c0> (a org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader) at java.lang.ClassLoader.preDefineClass(ClassLoader.java:666) at java.lang.ClassLoader.defineClass(ClassLoader.java:794) at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.internalDefineClass(JavaDialectRuntimeData.java:694) at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:665) locked <0x00007f963ed294b0> (a java.lang.Object) at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.loadClass(JavaDialectRuntimeData.java:642) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at org.drools.core.rule.MVELDialectRuntimeData.getParserConfiguration(MVELDialectRuntimeData.java:299) at org.drools.core.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238) at org.drools.core.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:264) at org.drools.core.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:248) at org.drools.core.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:214) at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:131) at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:63) at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:366) at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:300) at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:73) at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2017) at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1334) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288) at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278) "Thread-33-CustomClass-executor[9 9]": at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:662) waiting to lock <0x00007f963ed294b0> (a java.lang.Object) at org.drools.core.rule.JavaDialectRuntimeData$PackageClassLoader.loadClass(JavaDialectRuntimeData.java:642) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at com.cdr.apEventWrapperRules.ConstructorApBeansWrapper.constructorApBeansWrapper(ConstructorApBeansWrapper.java:55) at com.cdr.apEventWrapperRules.Rule_UCR2359988097.defaultConsequence(Rule_UCR2359988097.java:7) at com.cdr.apEventWrapperRules.Rule_UCR2359988097DefaultConsequenceInvokerGenerated.evaluate(Unknown Source) at com.cdr.apEventWrapperRules.Rule_UCR2359988097DefaultConsequenceInvoker.evaluate(Unknown Source) at org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1089) at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:121) at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:74) at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1007) at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1350) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288) at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278) Found 1 deadlock.