[rules-users] Drools locking threads

I need some support with Drools. I'm using Drools 5.2 in a multi-threaded environment. Basicaly, every login into a website is calling an execute method in a StatelessKnowledgeSession. After some time, threads start to lock as below: "[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'" id=18 idx=0xc0 tid=7267 prio=5 alive, in native, blocked, daemon -- Blocked trying to get lock: org/drools/event/RuleBaseEventSupport@0x2aab52d6f518[fat lock] at jrockit/vm/Threads.waitForUnblockSignal()V(Native Method) at jrockit/vm/Locks.fatLockBlockOrSpin(Locks.java:1679)[optimized] at jrockit/vm/Locks.lockFat(Locks.java:1780)[optimized] at jrockit/vm/Locks.monitorEnterSecondStageHard(Locks.java:1312)[optimized] at jrockit/vm/Locks.monitorEnterSecondStage(Locks.java:1259)[optimized] at org/drools/event/AbstractEventSupport.addEventListener(AbstractEventSupport.java:65)[inlined] at org/drools/common/AbstractRuleBase.addEventListener(AbstractRuleBase.java:1018)[optimized] at org/drools/impl/KnowledgeBaseImpl.addEventListener(KnowledgeBaseImpl.java:127)[optimized] at org/jbpm/process/instance/ProcessRuntimeImpl.initProcessEventListeners(ProcessRuntimeImpl.java:201) at org/jbpm/process/instance/ProcessRuntimeImpl.<init>(ProcessRuntimeImpl.java:68)[optimized] at org/jbpm/process/instance/ProcessRuntimeFactoryServiceImpl.newProcessRuntime(ProcessRuntimeFactoryServiceImpl.java:10) at org/jbpm/process/instance/ProcessRuntimeFactoryServiceImpl.newProcessRuntime(ProcessRuntimeFactoryServiceImpl.java:6) at org/drools/runtime/process/ProcessRuntimeFactory.newProcessRuntime(ProcessRuntimeFactory.java:12) at org/drools/common/AbstractWorkingMemory.createProcessRuntime(AbstractWorkingMemory.java:359)[inlined] at org/drools/common/AbstractWorkingMemory.setKnowledgeRuntime(AbstractWorkingMemory.java:1260)[inlined] at org/drools/impl/StatefulKnowledgeSessionImpl.<init>(StatefulKnowledgeSessionImpl.java:116)[inlined] at org/drools/impl/StatelessKnowledgeSessionImpl.newWorkingMemory(StatelessKnowledgeSessionImpl.java:129)[inlined] at org/drools/impl/StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:293)[optimized] at br/com/cielo/engineRules/services/impl/CancelamentoRuleBean.validarRegrasCancelamento(CancelamentoRuleBean.java:79)[optimized] at br/com/cielo/engineRules/services/impl/CancelamentoRuleEJB_vyscvn_EOImpl.validarRegrasCancelamento(CancelamentoRuleEJB_vyscvn_EOImpl.java:205)[optimized] at br/com/cielo/engineRules/services/impl/CancelamentoRuleEJB_vyscvn_EOImpl_WLSkel.invoke(ILweblogic/rmi/spi/InboundRequest;Lweblogic/rmi/spi/OutboundResponse;Ljava/lang/Object;)Lweblogic/rmi/spi/OutboundResponse;(Unknown Source)[optimized] at weblogic/rmi/internal/BasicServerRef.invoke(BasicServerRef.java:589)[optimized] at weblogic/rmi/cluster/ClusterableServerRef.invoke(ClusterableServerRef.java:230)[optimized] at weblogic/rmi/internal/BasicServerRef$1.run(BasicServerRef.java:477)[inlined] at weblogic/security/acl/internal/AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)[inlined] at weblogic/security/service/SecurityManager.runAs(Lweblogic/security/acl/internal/AuthenticatedSubject;Lweblogic/security/acl/internal/AuthenticatedSubject;Ljava/security/PrivilegedExceptionAction;)Ljava/lang/Object;(Unknown Source)[inlined] at weblogic/rmi/internal/BasicServerRef.handleRequest(BasicServerRef.java:473)[inlined] at weblogic/rmi/internal/wls/WLSExecuteRequest.run(WLSExecuteRequest.java:118)[optimized] at weblogic/work/ExecuteThread.execute(ExecuteThread.java:201)[optimized] at weblogic/work/ExecuteThread.run(ExecuteThread.java:173) at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method) -- end of trace I went to Drool's source code and there's a synchronized section right before the lock. I'm afraid Drools doesn't support multi-thread processing. Does anyone know anything about this issue??? Tks -- View this message in context: http://drools.46999.n3.nabble.com/Drools-locking-threads-tp4021732.html Sent from the Drools: User forum mailing list archive at Nabble.com.