问题
I'm trying to create a (Weblogic) WAR deployment for a Apache Camel based project which runs fine on tomcat embedded. However when I start the server, I'm noticing a deadlock in LRUCacheFactory.
The reported error is shown below:
Found one Java-level deadlock:
=============================
"Camel Thread #0 - LRUCacheFactory":
waiting to lock monitor 0x85ec85a8 (object 0xb30c5c28, a weblogic.utils.classloaders.ChangeAwareClassLoader),
which is held by "[STANDBY] ExecuteThread: '43' for queue: 'weblogic.kernel.Default (self-tuning)'"
"[STANDBY] ExecuteThread: '43' for queue: 'weblogic.kernel.Default (self-tuning)'":
waiting to lock monitor 0x85e8f9a8 (object 0xd1eef340, a java.lang.Object),
which is held by "Camel Thread #0 - LRUCacheFactory"
Java stack information for the threads listed above:
===================================================
"Camel Thread #0 - LRUCacheFactory":
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:81)
- waiting to lock <0xb30c5c28> (a weblogic.utils.classloaders.ChangeAwareClassLoader)
- locked <0xd1eef340> (a java.lang.Object)
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:53)
at org.apache.camel.support.LRUCacheFactory.newLRUCache(LRUCacheFactory.java:93)
at org.apache.camel.support.LRUCacheFactory.lambda$warmUp$0(LRUCacheFactory.java:70)
at org.apache.camel.support.LRUCacheFactory$$Lambda$132/22573581.run(Unknown Source)
at java.lang.Thread.run(Thread.java:748)
"[STANDBY] ExecuteThread: '43' for queue: 'weblogic.kernel.Default (self-tuning)'":
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:68)
- waiting to lock <0xd1eef340> (a java.lang.Object)
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:53)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at weblogic.utils.classloaders.GenericClassLoader.defineClassInternal(GenericClassLoader.java:1113)
at weblogic.utils.classloaders.GenericClassLoader.defineClass(GenericClassLoader.java:1046)
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:1038)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:990)
at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:104)
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:82)
- locked <0xb30c5c28> (a weblogic.utils.classloaders.ChangeAwareClassLoader)
- locked <0xd1da07d8> (a java.lang.Object)
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:53)
at org.apache.camel.support.LRUCacheFactory.newLRUWeakCache(LRUCacheFactory.java:171)
at org.apache.camel.support.management.MBeanInfoAssembler.start(MBeanInfoAssembler.java:69)
at org.apache.camel.support.service.ServiceHelper.startService(ServiceHelper.java:55)
at org.apache.camel.support.management.DefaultManagementMBeanAssembler.doStart(DefaultManagementMBeanAssembler.java:117)
at org.apache.camel.support.service.ServiceSupport.start(ServiceSupport.java:86)
- locked <0xd1ce1420> (a java.lang.Object)
at org.apache.camel.support.service.ServiceHelper.startService(ServiceHelper.java:55)
at org.apache.camel.impl.AbstractCamelContext.internalAddService(AbstractCamelContext.java:1359)
at org.apache.camel.impl.AbstractCamelContext.doAddService(AbstractCamelContext.java:1315)
at org.apache.camel.impl.AbstractCamelContext.doAddService(AbstractCamelContext.java:1310)
at org.apache.camel.impl.AbstractCamelContext.setManagementMBeanAssembler(AbstractCamelContext.java:2489)
at org.apache.camel.spring.SpringCamelContext.<init>(SpringCamelContext.java:71)
at org.apache.camel.spring.SpringCamelContext.<init>(SpringCamelContext.java:75)
at org.apache.camel.spring.javaconfig.CamelConfiguration.createCamelContext(CamelConfiguration.java:185)
at org.apache.camel.spring.javaconfig.CamelConfiguration.camelContext(CamelConfiguration.java:160)
at com.oracle.healthinsurance.integration.gateway.simmodule.SimmoduleConfigurator$SimmoduleConfiguration$$EnhancerBySpringCGLIB$$144970ea.CGLIB$camelContext$6(<generated>)
at com.oracle.healthinsurance.integration.gateway.simmodule.SimmoduleConfigurator$SimmoduleConfiguration$$EnhancerBySpringCGLIB$$144970ea$$FastClassBySpringCGLIB$$345beb5.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
at com.oracle.healthinsurance.integration.gateway.simmodule.SimmoduleConfigurator$SimmoduleConfiguration$$EnhancerBySpringCGLIB$$144970ea.camelContext(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1305)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1144)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$47/28728726.getObject(Unknown Source)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
- locked <0xe4601dc0> (a java.util.concurrent.ConcurrentHashMap)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1247)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:760)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:509)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1305)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1144)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$47/28728726.getObject(Unknown Source)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
- locked <0xe4601dc0> (a java.util.concurrent.ConcurrentHashMap)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
- locked <0xe46023e0> (a java.lang.Object)
at com.oracle.healthinsurance.integration.gateway.spi.AbstractInterfaceModuleConfigurator.configure(AbstractInterfaceModuleConfigurator.java:19)
at com.oracle.healthinsurance.integration.gateway.impl.bootstrap.ParentChildServiceLoader.lambda$lightweightRootLoadedEventHandler$0(ParentChildServiceLoader.java:20)
at com.oracle.healthinsurance.integration.gateway.impl.bootstrap.ParentChildServiceLoader$$Lambda$129/20173443.accept(Unknown Source)
at java.lang.Iterable.forEach(Iterable.java:75)
at com.oracle.healthinsurance.integration.gateway.impl.bootstrap.ParentChildServiceLoader.lightweightRootLoadedEventHandler(ParentChildServiceLoader.java:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:259)
at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:179)
at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:142)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:402)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:408)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:372)
at com.oracle.healthinsurance.integration.gateway.webapp.GatewayWebApplicationInitializer.onStartup(GatewayWebApplicationInitializer.java:53)
at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:171)
at weblogic.servlet.internal.WebAppServletContext.initContainerInitializer(WebAppServletContext.java:1425)
at weblogic.servlet.internal.WebAppServletContext.initContainerInitializers(WebAppServletContext.java:1364)
at weblogic.servlet.internal.WebAppServletContext.initContainerInitializers(WebAppServletContext.java:1345)
at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1917)
- locked <0xe3382a10> (a weblogic.servlet.internal.WebAppServletContext)
at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:3101)
at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1843)
at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:884)
at weblogic.application.internal.ExtensibleModuleWrapper$StartStateChange.next(ExtensibleModuleWrapper.java:360)
at weblogic.application.internal.ExtensibleModuleWrapper$StartStateChange.next(ExtensibleModuleWrapper.java:356)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
at weblogic.application.internal.ExtensibleModuleWrapper.start(ExtensibleModuleWrapper.java:138)
at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:124)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:233)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:228)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:78)
at weblogic.application.internal.flow.StartModulesFlow.activate(StartModulesFlow.java:52)
at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:752)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:262)
at weblogic.application.internal.SingleModuleDeployment.activate(SingleModuleDeployment.java:52)
at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:165)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:90)
at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:631)
at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:171)
at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:121)
at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:348)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:907)
at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1468)
- locked <0xb3079aa8> (a java.util.ArrayList)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:459)
at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:181)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:217)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:14)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:69)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:670)
at weblogic.invocation.ComponentInvocationContextManager._runAs(ComponentInvocationContextManager.java:352)
at weblogic.invocation.ComponentInvocationContextManager.runAs(ComponentInvocationContextManager.java:337)
at weblogic.work.LivePartitionUtility.doRunWorkUnderContext(LivePartitionUtility.java:57)
at weblogic.work.PartitionUtility.runWorkUnderContext(PartitionUtility.java:41)
at weblogic.work.SelfTuningWorkManagerImpl.runWorkUnderContext(SelfTuningWorkManagerImpl.java:644)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:415)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:355)
Found 1 deadlock.
I expect Apache Camel to load its components without the deadlock occurring.
回答1:
The above was tried using Apache Camel 3.0.0-M2. After downgrading to 2.23.1 - the problem no longer appears. So this might be related to the new version of Apache Camel 3.0.0
来源：https://stackoverflow.com/questions/55574432/apache-camel-lrucachefactory-deadlocks-in-weblogic-12-2