Question

我们在GlassFish 3.1.2.2服务器中部署了一个Singleton EJB bean，并带有以下注释：

@ConcurrencyManagement(ConcurrencyManagementType.BEAN)
@Singleton
@Startup
@Local(XXX.class)
@TransactionAttribute(TransactionAttributeType.NEVER)

将bean注入到servlet中，该servlet上调用了几个方法。随机地，server.log显示在提交XA事务时，bean的随机方法抛出了ConcurrentModificationException。

javax.transaction.xa.XAException: java.util.ConcurrentModificationException
    at com.sun.enterprise.resource.ConnectorXAResource.handleResourceException(ConnectorXAResource.java:115)
    at com.sun.enterprise.resource.ConnectorXAResource.resetAssociation(ConnectorXAResource.java:287)
    at com.sun.enterprise.resource.ConnectorXAResource.commit(ConnectorXAResource.java:128)
    at com.sun.enterprise.transaction.JavaEETransactionImpl.commit(JavaEETransactionImpl.java:501)
    at com.sun.enterprise.transaction.JavaEETransactionManagerSimplified.commit(JavaEETransactionManagerSimplified.java:855)
    at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5136)
    at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4901)
    at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2045)
    at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1994)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:89)
    at com.sun.proxy.$Proxy258.getHostMonitorRecord(Unknown Source)
    at ...XProtocolHostServletBase.handleDocument(XProtocolHostServletBase.java:174)
    at ...TransactionHandlerServletBase.doPost(TransactionHandlerServletBase.java:44)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:724)

显然，即使bean使用TransactionAttributeType.NEVER注释，方法调用也会附加到容器托管事务。我的问题是为什么bean仍然是事务性的，以及可能导致此异常随机发生的原因。

Answer 1

我调试了GlassFish源代码，并找出了为什么我们bean的某些方法仍然是事务性的原因。

原因是我们的bean有一个没有@TransactionAttribute批注的超类，因此我们bean中未被覆盖的方法具有默认的TransactionAttributeType.REQUIRED。

在继承的情况下容器如何处理与事务相关的注释是解释e。 G。在这个答案中https://stackoverflow.com/a/5542890/5048604

在提交XA事务时由GlassFish 3.1.2.2抛出的ConcurrentModificationException

1 个答案: