Concurrency 发生锁定时如何查找根本原因

我正在使用EJB容器（Glassfish 4.0）运行我的web应用程序，它将使用线程池中的一个线程来处理来自客户端的每个请求。在运行一段时间后，许多线程似乎被阻塞。我使用jstack获得了以下信息：

"default-http(6)" daemon prio=10 tid=0x00007f2c9c009000 nid=0x6cb9 waiting on condition [0x00007f2fd53fb000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00007f4740824750> (a java.util.concurrent.locks.ReentrantReadWriteLock$FairSync)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
    at java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock(ReentrantReadWriteLock.java:945)
    at com.sun.ejb.containers.CMCSingletonContainer._getContext(CMCSingletonContainer.java:141)
    at com.sun.ejb.containers.BaseContainer.getContext(BaseContainer.java:2516)
    at com.sun.ejb.containers.BaseContainer.preInvoke(BaseContainer.java:1906)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:210)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
    at com.sun.proxy.$Proxy475.openAccount(Unknown Source)
    at com.creditcloud.boc.local.__EJB31_Generated__BocClient__Intf____Bean__.openAccount(Unknown Source)
    at com.creditcloud.boc.BocServiceBean.openAccount(BocServiceBean.java:242)
    at sun.reflect.GeneratedMethodAccessor1053.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
    at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
    at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4695)
    at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:630)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
    at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:55)
    at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
    at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
    at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
    at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4667)
    at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4655)
    at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:205)
    at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:79)
    at com.sun.proxy.$Proxy470.openAccount(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor1052.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie.dispatchToMethod(ReflectiveTie.java:143)
    at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:173)
    at com.sun.corba.ee.impl.protocol.ServerRequestDispatcherImpl.dispatchToServant(ServerRequestDispatcherImpl.java:528)
    at com.sun.corba.ee.impl.protocol.ServerRequestDispatcherImpl.dispatch(ServerRequestDispatcherImpl.java:199)
    at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.handleRequestRequest(MessageMediatorImpl.java:1549)
    at com.sun.corba.ee.impl.protocol.SharedCDRClientRequestDispatcherImpl.marshalingComplete(SharedCDRClientRequestDispatcherImpl.java:119)
    at com.sun.corba.ee.impl.protocol.ClientDelegateImpl.invoke(ClientDelegateImpl.java:272)
    at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke(StubInvocationHandlerImpl.java:198)
    at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:150)
    at com.sun.corba.ee.impl.presentation.rmi.codegen.CodegenStubBase.invoke(CodegenStubBase.java:226)
    at com.creditcloud.boc.api.__BocService_Remote_DynamicStub.openAccount(com/creditcloud/boc/api/__BocService_Remote_DynamicStub.java)
    at com.creditcloud.boc.api._BocService_Wrapper.openAccount(com/creditcloud/boc/api/_BocService_Wrapper.java)
    at com.creditcloud.creditmarket.local.BocBridge.openAccount(BocBridge.java:140)
    at com.creditcloud.creditmarket.local.BocBridge.openAccount(BocBridge.java:185)
    at sun.reflect.GeneratedMethodAccessor789.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
    at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
    at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4695)
    at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:630)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
    at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:46)
    at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
    at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
    at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
    at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4667)
    at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4655)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
    at com.sun.proxy.$Proxy641.openAccount(Unknown Source)
    at com.creditcloud.creditmarket.local.__EJB31_Generated__BocBridge__Intf____Bean__.openAccount(Unknown Source)
    at com.creditcloud.creditmarket.resources.api.v2.BocApiResource.openAccount(BocApiResource.java:75)
    at sun.reflect.GeneratedMethodAccessor788.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:125)
    at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:195)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:91)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:346)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:341)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101)
    at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:224)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:198)
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:946)
    at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:323)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:372)
    at org.glassfish.jersey.servlet.ServletContainer.doFilter(ServletContainer.java:525)
    at org.glassfish.jersey.servlet.ServletContainer.doFilter(ServletContainer.java:473)
    at org.glassfish.jersey.servlet.ServletContainer.doFilter(ServletContainer.java:410)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
    at java.lang.Thread.run(Thread.java:744)

“默认http（6）”守护程序prio=10 tid=0x00007f2c9c009000 nid=0x6cb9等待条件[0x00007f2fd53fb000]
java.lang.Thread.State:等待（停车）
在sun.misc.Unsafe.park（本机方法）
-停车等待（java.util.concurrent.locks.ReentrantReadWriteLock$FairSync）
位于java.util.concurrent.locks.LockSupport.park（LockSupport.java:186）
位于java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt（AbstractQueuedSynchronizer.java:834）
位于java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued（AbstractQueuedSynchronizer.java:867）
位于java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire（AbstractQueuedSynchronizer.java:1197）
位于java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock（ReentrantReadWriteLock.java:945）
位于com.sun.ejb.containers.CMCSingletonContainer.\u getContext（CMCSingletonContainer.java:141）
位于com.sun.ejb.containers.BaseContainer.getContext（BaseContainer.java:2516）
位于com.sun.ejb.containers.BaseContainer.preInvoke（BaseContainer.java:1906）
在com.sun.ejb.containers.ejblocationHandler.invoke（ejblocationHandler.java:210）上
在com.sun.ejb.containers.ejblocationHandlerDelegate.invoke（ejblocationHandlerDelegate.java:88）
位于com.sun.proxy.$Proxy475.openAccount（未知来源）
在com.creditcloud.boc.local.\uuuuuejb31\u生成的\uuuuubocclient\uuuuuuuuuuuuuuuuuuuuuu Bean\uuuuuuuuu.openAccount（未知源）
在com.creditcloud.boc.BocServiceBean.openAccount上（BocServiceBean.java:242）
位于sun.reflect.GeneratedMethodAccessor1053.invoke（未知源）
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）中
位于java.lang.reflect.Method.invoke（Method.java:606）
位于org.glassfish.ejb.security.application.EJBSecurityManager.runMethod（EJBSecurityManager.java:1081）
位于org.glassfish.ejb.security.application.EJBSecurityManager.invoke（EJBSecurityManager.java:1153）
位于com.sun.ejb.containers.BaseContainer.invokeBeanMethod（BaseContainer.java:4695）
在com.sun.ejb.ejbInvokeBeanMethod（ejbInvokeBeanMethod.java:630）上
位于com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext（InterceptorManager.java:822）
在com.sun.ejb.ejbinavocation.procedure（ejbinavocation.java:582）
位于org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke（AbstractEJBRequestScopeActivationInterceptor.java:55）
位于sun.reflect.GeneratedMethodAccessor92.invoke（未知源）
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）中
位于java.lang.reflect.Method.invoke（Method.java:606）
位于com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept（InterceptorManager.java:883）
位于com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext（InterceptorManager.java:822）
在com.sun.ejb.ejbinavocation.procedure（ejbinavocation.java:582）
位于com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall（SystemInterceptorProxy.java:163）
位于com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke（SystemInterceptorProxy.java:140）
位于sun.reflect.GeneratedMethodAccessor93.invoke（未知源）
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）中
位于java.lang.reflect.Method.invoke（Method.java:606）
位于com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept（InterceptorManager.java:883）
位于com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext（InterceptorManager.java:822）
在com.sun.ejb.containers.interceptors.InterceptorManager.intercept上（InterceptorManager.java:369）
在com.sun.ejb.containers.BaseContainer.\uuu截取（BaseContainer.java:4667）
在com.sun.ejb.containers.BaseContainer.intercept（BaseContainer.java:4655）上
位于com.sun.ejb.containers.ejbObjectInLocationHandler.invoke（ejbObjectInLocationHandler.java:205）
位于com.sun.ejb.containers.ejbObjectInLocationHandlerDelegate.invoke（ejbObjectInLocationHandlerDelegate.java:79）
位于com.sun.proxy.$Proxy470.openAccount（未知来源）
位于sun.reflect.GeneratedMethodAccessor1052.invoke（未知源）
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）中
位于java.lang.reflect.Method.invoke（Method.java:606）
位于com.sun.corba.ee.impl.presentation.rmi.reflectVetie.dispatchToMethod（reflectVetie.java:143）
在com.sun.corba.ee.impl.presentation.rmi.ReflectVetie._调用（reflectVetie.java:173）
位于com.sun.corba.ee.impl.protocol.ServerRequestDispatcherImpl.dispatchToServant（ServerRequestDispatcherImpl.java:528）
位于com.sun.corba.ee.impl.protocol.ServerRequestDispatcherImpl.dispatch（ServerRequestDispatcherImpl.java:199）
位于com.sun.corba.ee.impl.protocol.MessageMediatorImpl.HandlereRequest（MessageMediatorImpl.java:1549）
在com.sun.corba.ee.impl.protocol.SharedCDRClientRequestDispatcherImpl.marshalingComplete上（SharedCDRClientRequestDispatcherImpl.java:119）
com.sun.corba.ee.impl.protocol.ClientDelegateImpl.invoke（ClientDelegateImpl.java:272）
位于com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke（StubInvocationHandlerImpl.java:198）
com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke（StubInvocationHandlerImpl.java:150）
位于com.sun.corba.ee.impl.presentation.rmi.codegen.CodegenStubBase.invoke（CodegenStubBase.java:226）
在com.creditcloud.boc.api.\uuubocservice\uremote\udynamicsub.openAccount（com/creditcloud/boc/api/\uuuubocservice\uremote\udynamicsub.java）
在com.creditcloud.boc.api.\u-BocService\u-Wrapper.openAccount（com/creditcloud/boc/api/\u-BocService\u-Wrapper.java）