調用context.lookup（「myJndiBeanName」）返回bean的實例？

Question

有關EJB 3無狀態bean jndi查詢的上下文的快速問題。 context.lookup("myBean")是否返回一個bean的實例？我的豆不是一個單身人士。

我問的原因是因爲在插入和刪除時，我一直在JBoss AS 6上爲我的持久性CRUD服務獲取事務超時。我有一個Callable，其中我注入了一個持久性CRUD無狀態bean，以便它在其自己的事務中只執行5,000次插入（因此每個調用都返回一個新實例而不是相同的實例）。在Callable.call()方法中，我向無狀態bean注入了context.lookup("myBean")，因爲我有大約20個可調參數傳遞給了ExecutorService.submit(Callable<T>)。底線是我不明白爲什麼它在進程結束時超時（所有數據都成功插入：600,000個插入），但在作業結束時，超時錯誤由JBoss拋出。

堆棧跟蹤「引起」錯誤：

 
Caused by: javax.transaction.RollbackException: ARJUNA-16063 The transaction is not active! 
     at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1148) [:6.0.0.Final] 
     at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:119) [:6.0.0.Final] 
     at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75) [:6.0.0.Final] 
     at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.endTransaction(CMTTxInterceptor.java:82) [:0.0.1] 
     ... 70 more 

完整堆棧跟蹤：

 
    14:40:14,609 SEVERE [context] javax.ejb.EJBTransactionRolledbackException: Transaction rolled back: javax.faces.event.AbortProcessingException: javax.ejb.EJBTransactionRolledbackException: Transactio 
rolled back 
     at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:178) [:2.0.3-] 
     at javax.faces.event.ActionEvent.processListener(ActionEvent.java:84) [:2.0.3-] 
     at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:773) [:2.0.3-] 
     at javax.faces.component.UICommand.broadcast(UICommand.java:296) [:2.0.3-] 
     at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781) [:2.0.3-] 
     at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246) [:2.0.3-] 
     at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77) [:2.0.3-] 
     at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97) [:2.0.3-] 
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114) [:2.0.3-] 
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308) [:2.0.3-] 
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.0.0.Final] 
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.0.0.Final] 
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.0.0.Final] 
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) [:6.0.0.Final] 
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.0.0.Final] 
     at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final] 
     at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final] 
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.0.0.Final] 
     at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.0.0.Final] 
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) [:6.0.0.Final] 
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.0.0.Final] 
     at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.0.0.Final] 
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.0.0.Final] 
     at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.0.0.Final] 
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.0.0.Final] 
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.0.0.Final] 
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.0.0.Final] 
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.0.0.Final] 
     at java.lang.Thread.run(Thread.java:619) [:1.6.0_20] 
Caused by: javax.ejb.EJBTransactionRolledbackException: Transaction rolled back 
     at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.handleEndTransactionException(CMTTxInterceptor.java:115) [:0.0.1] 
     at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.endTransaction(CMTTxInterceptor.java:87) [:0.0.1] 
     at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:255) [:0.0.1] 
     at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.required(CMTTxInterceptor.java:349) [:0.0.1] 
     at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.invoke(CMTTxInterceptor.java:209) [:0.0.1] 
     at org.jboss.ejb3.tx2.aop.CMTTxInterceptorWrapper.invoke(CMTTxInterceptorWrapper.java:52) [:0.0.1] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76) [:1.0.0.GA] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42) [:1.0.3] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:182) [:1.7.17] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41) [:1.7.17] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67) [:1.7.17] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.ejb3.core.context.CurrentInvocationContextInterceptor.invoke(CurrentInvocationContextInterceptor.java:47) [:1.7.17] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67) [:1.0.1] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.ejb3.interceptor.EJB3TCCLInterceptor.invoke(EJB3TCCLInterceptor.java:86) [:1.7.17] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.ejb3.session.SessionSpecContainer.invoke(SessionSpecContainer.java:323) [:1.7.17] 
     at org.jboss.ejb3.session.SessionSpecContainer.invoke(SessionSpecContainer.java:380) [:1.7.17] 
     at sun.reflect.GeneratedMethodAccessor335.invoke(Unknown Source) [:1.6.0_20] 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_20] 
     at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_20] 
     at org.jboss.ejb3.proxy.impl.handler.session.SessionLocalProxyInvocationHandler$LocalContainerInvocation.invokeTarget(SessionLocalProxyInvocationHandler.java:184) [:1.0.11] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.ejb3.async.impl.interceptor.AsynchronousClientInterceptor.invoke(AsynchronousClientInterceptor.java:143) [:1.7.17] 
     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.1.GA] 
     at org.jboss.ejb3.proxy.impl.handler.session.SessionLocalProxyInvocationHandler$LocalInvokableContextHandler.invoke(SessionLocalProxyInvocationHandler.java:159) [:1.0.11] 
     at $Proxy217.invoke(Unknown Source)  at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:185) [:1.0.11] 
     at $Proxy220.runEngine(Unknown Source) at com.ls.forecast.web.beans.ExpectedReturnEngineBean.runEngine(ExpectedReturnEngineBean.java:20) [:] 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_20] 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_20] 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_20] 
     at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_20] 
     at org.apache.el.parser.AstValue.invoke(AstValue.java:196) [:6.0.0.Final] 
     at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276) [:6.0.0.Final] 
     at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:149) [:2.0.3-] 
     ... 28 more 
Caused by: javax.transaction.RollbackException: ARJUNA-16063 The transaction is not active! 
     at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1148) [:6.0.0.Final] 
     at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:119) [:6.0.0.Final] 
     at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75) [:6.0.0.Final] 
     at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.endTransaction(CMTTxInterceptor.java:82) [:0.0.1] 
     ... 70 more 

Answer 1

沒有爲無狀態會話bean，你總是得到相同的情況下無法保證。這些bean通常是經常合併的，容器只會使用池中的任何bean。

分佈在5k批次中的600k插入將在它們並行運行時創建120個slsb，它們都試圖並行訪問數據庫，所有嘗試獲取鎖等。我猜你只是「遇到並行任務相互阻塞足以讓整套事務超時並被回滾。

您可以發佈您的代碼，因爲到目前爲止，這最終在閱讀cyrstal球。

Answer 2

我意識到我的設計不符合EJB規範，除非使用EJB API，否則不應使用多線程。我重寫了我的類，以便多線程代碼位於EJB中並使用註釋@Asynchronous。沒有更多線程相關的代碼（ExecutorService，Callable等）。