无法使用 JNDI 访问远程 EJB 接口答案

【问题标题】：Cannot access remote EJB interface using JNDI无法使用 JNDI 访问远程 EJB 接口
【发布时间】：2012-02-23 06:33:08
【问题描述】：

如何远程访问一个方法，或者我做错了什么？你能告诉我吗？：

public class OfferManagerBeanTest {
    private static Context ctx;

    @BeforeClass
    public static void initContainer() throws Exception
    {
        Properties props = new Properties();
        props.setProperty("java.naming.factory.initial", "com.sun.enterprise.naming.SerialInitContextFactory");
        props.setProperty("java.naming.factory.url.pkgs", "com.sun.enterprise.naming");
        props.setProperty("java.naming.factory.state", "com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl");
        props.setProperty("org.omg.CORBA.ORBInitialHost", "localhost");
        props.setProperty("org.omg.CORBA.ORBInitialPort", "3700");

        ctx = new InitialContext(props);
    }

    @Test
    public void commitOfferTest() throws NamingException
    {
        OfferManager offerManager = (OfferManager) ctx.lookup("java:global/project/projectEJB/OfferManagerBean");
        assertNotNull(offerManager);    
    }
}

我的问题是运行此测试用例后出现错误。

我得到它的工作，但我不明白为什么它在另一种情况下工作。

这是我的 EJB：

@Stateless
public class OfferManagerBean implements OfferManager, OfferManagerLocal

其中OfferManager 是@Remote 接口，OfferManagerLocal 是@Local 接口。如果我在我的 WebProject(war 文件) 上运行它，它正在工作......（我没有那里的属性）

如果我让一切都像这样运行 jUnit 测试，我会收到如下错误：

javax.naming.NamingException: Lookup failed for 'java:global/project/projectEJB/OfferManagerBean' in SerialContext[myEnv={org.omg.CORBA.ORBInitialPort=3700, java.naming.factory.initial=com.sun.enterprise.naming.SerialInitContextFactory, org.omg.CORBA.ORBInitialHost=localhost, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: OfferManagerBean not found]
    at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:518)
    at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:455)
    at javax.naming.InitialContext.lookup(InitialContext.java:411)
    at ro.project.ejb.test.OfferManagerBeanTest.commitOfferTest(OfferManagerBeanTest.java:50)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: javax.naming.NameNotFoundException: OfferManagerBean not found
    at com.sun.enterprise.naming.impl.TransientContext.doLookup(TransientContext.java:248)
    at com.sun.enterprise.naming.impl.TransientContext.lookup(TransientContext.java:215)
    at com.sun.enterprise.naming.impl.TransientContext.lookup(TransientContext.java:219)
    at com.sun.enterprise.naming.impl.TransientContext.lookup(TransientContext.java:219)
    at com.sun.enterprise.naming.impl.TransientContext.lookup(TransientContext.java:219)
    at com.sun.enterprise.naming.impl.SerialContextProviderImpl.lookup(SerialContextProviderImpl.java:77)
    at com.sun.enterprise.naming.impl.RemoteSerialContextProviderImpl.lookup(RemoteSerialContextProviderImpl.java:94)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie.dispatchToMethod(ReflectiveTie.java:144)
    at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:174)
    at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:528)
    at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:199)
    at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1624)
    at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1486)
    at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:990)
    at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:214)
    at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:742)
    at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.dispatch(CorbaMessageMediatorImpl.java:539)
    at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.doWork(CorbaMessageMediatorImpl.java:2324)
    at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.performWork(ThreadPoolImpl.java:497)
    at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:540)

我发现了类似的东西：

ctx.lookup("java:global/project/projectEJB/OfferManagerBean!ro.project.ejb.interfaces.OfferManager");

??没有更好/更短的解决方案吗？谁能告诉我为什么会这样？

如果我让我的声明如下：

@Stateless
public class OfferManagerBean implements OfferManager

一切正常。你知道我该如何解决这个问题吗？

【问题讨论】：

我没有明确回答您的问题，但一般来说，您不应该在课堂上同时实现本地和远程接口。远程方法将按值传递，而本地方法将按引用传递。你必须小心管理。

标签： java java-ee-6 glassfish-3 ejb-3.1

【解决方案1】：

您可以使用您的代码访问您的 EJB：

OfferManager offerManager = (OfferManager) 
                   ctx.lookup("java:global/project/projectEJB/OfferManagerBean");

仅如果您的 EJB 实现了一个接口。在这种情况下，很明显您对哪个界面感兴趣（只有一个，所以 - 这里没有魔法）。

但是，如果您的 EJB 实现了多个接口，那么您应该在通过 JNDI 访问它时指定您对哪个接口（视图）感兴趣。

因此，您必须使用 EJB 3.1 FR 规范的 4.4 全局 JNDI 访问 章中定义的完整路径：

java:global[/<app-name>]/<module-name>/<bean-name>[!<fully-qualified-intf-name>]

或使用规范中定义的java:app 或java:module。

【讨论】：