远程服务器重启后远程 EJB 的 InitialContext.lookup 失败

Question

我们的设置中，EJB A 在服务器 A 上运行，另一个 EJB B 在服务器 B 上运行。EJB A 通过 IIOP 连接到 EJB B。此设置通常有效，但如果服务器 B 重新启动，EJB A 将失败，直到服务器 A 也重新启动为止。

问题是，如果服务器 B 重新启动，则 EJB A 对 InitialContext.lookup 的所有调用都会失败，并出现“java.io.IOException：End-of-stream”异常，直到服务器 A 重新启动为止。我无法找到有关我们的应用程序服务器 (GlassFish) 是否对 InitialContext.lookup 进行任何类型的缓存的信息。是否还有其他原因导致在服务器重新启动之前查找失败？如果 InitialContext.lookup 缓存连接，我将如何解决这个问题？

我们的服务器运行 Sun Application Server 9.1。查找实际上是通过 org.springframework.jndi.JndiTemplate 完成的，但堆栈跟踪表明 JndiTemplate 正在调用 InitialContext.lookup()。

感谢您的任何见解。

PS 我应该澄清一下，我正在尝试弄清楚是否可以避免每次重新启动服务器 B 时都必须重新启动服务器 A。

JndiTemplate 的定义（其中一些文本用“x”和“#”涂黑）

<bean id="xxxxxxxxxx"  class="org.springframework.jndi.JndiTemplate">
  <property name="environment">
   <props>
    <prop key="java.naming.factory.url.pkgs">com.sun.enterprise.naming</prop>
    <prop key="java.naming.factory.initial">com.sun.enterprise.naming.SerialInitContextFactory</prop>
    <prop key="java.naming.provider.url">iiop://xxxxxxxxxx:####</prop>
    <prop key="java.naming.factory.state">com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl</prop>
    <prop key="org.omg.CORBA.ORBInitialHost">xxxxxxxxxx</prop>
    <prop key="org.omg.CORBA.ORBInitialPort">####</prop>
   </props>
  </property>
 </bean> 

和堆栈跟踪（其中一部分被“[应用程序方法]”替换）：

NAM0004: Exception during name lookup : {0}
java.rmi.MarshalException: CORBA COMM_FAILURE 1398079696 Maybe; nested exception is: 
 org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 208 completed: Maybe
 at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.mapSystemException(Util.java:271)
 at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke(StubInvocationHandlerImpl.java:205)
 at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:152)
 at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(BCELStubBase.java:225)
 at com.sun.enterprise.naming._SerialContextProvider_DynamicStub.lookup(com/sun/enterprise/naming/_SerialContextProvider_DynamicStub.java)
 at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:398)
 at javax.naming.InitialContext.lookup(InitialContext.java:351)
 at org.springframework.jndi.JndiTemplate$1.doInContext(JndiTemplate.java:155)
 at org.springframework.jndi.JndiTemplate.execute(JndiTemplate.java:88)
 at org.springframework.jndi.JndiTemplate.lookup(JndiTemplate.java:153)
 at [application methods]
 at org.springframework.web.servlet.mvc.SimpleFormController.processFormSubmission(SimpleFormController.java:267)
 at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:265)
 at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
 at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809)
 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
 at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:738)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
 at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:299)
 at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:271)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:202)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
 at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:206)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:150)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
 at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:272)
 at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:637)
 at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:568)
 at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:813)
 at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
 at com.sun.enterprise.web.connector.grizzly.ssl.SSLReadTask.process(SSLReadTask.java:440)
 at com.sun.enterprise.web.connector.grizzly.ssl.SSLReadTask.doTask(SSLReadTask.java:228)
 at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
 at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
Caused by: org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 208 completed: Maybe
 at com.sun.corba.ee.impl.logging.ORBUtilSystemException.connectionAbort(ORBUtilSystemException.java:2862)
 at com.sun.corba.ee.impl.logging.ORBUtilSystemException.connectionAbort(ORBUtilSystemException.java:2880)
 at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.doOptimizedReadStrategy(SocketOrChannelConnectionImpl.java:1788)
 at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.doWork(SocketOrChannelConnectionImpl.java:1263)
 at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:555)
Caused by: org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 211  completed: No
 at com.sun.corba.ee.impl.logging.ORBUtilSystemException.ioexceptionWhenReadingConnection(ORBUtilSystemException.java:2946)
 at com.sun.corba.ee.impl.logging.ORBUtilSystemException.ioexceptionWhenReadingConnection(ORBUtilSystemException.java:2965)
 at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.nonBlockingRead(SocketOrChannelConnectionImpl.java:2000)
 at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.doOptimizedReadStrategy(SocketOrChannelConnectionImpl.java:1713)
 ... 2 more
Caused by: java.io.IOException: End-of-stream
 at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.nonBlockingRead(SocketOrChannelConnectionImpl.java:1989)
 ... 3 more

Answer 1

通过堆栈跟踪，我可以得出结论，Spring Framework 本身不缓存 - 它实际上调用 InitialContext.lookup()。尽管如此，堆栈跟踪和错误代码仍然暗示存在连接中断。

WebSphere 过去曾经有过类似的错误，后来已修复。原来是应用服务器本身做的缓存问题。我怀疑 SunAS 在 9.1 中也有类似的错误...

Isaac

Answer 2

出于同步目的，syncChanges() 方法会定期运行。主要思想是如果发生错误则关闭上下文（在重新启动示例服务器后）并重新初始化它。使用方法 context.close() 关闭上下文后，您应该将其值设为 null。

public class SyncOperationsService {
    private InitialContext context;
    private SyncOperationsRemote syncOperationsRemote = null; //RemoteBean

    public String syncChanges() {
        try {
            if (context == null) {
                context = new InitialContext(properties);
            }

            if (context != null) {
                syncOperationsRemote = (SyncOperationsRemote) context.lookup("PathToYourRemoteBean");
            }

            result = syncOperationsRemote.syncChanges(dbImportList);  //Try execute remote bean

        } catch (Exception e) {
            log.error(e.getMessage());

            try {
                context.close();
            } catch (Exception e2) {
                log.error(e2.getMessage());
            }
            context = null;
        }
    }
}