jakarta-ee - Hello World !使用远程无状态 session Bean

Question

再会!我是 JavaEE 6 的新手。我尝试使用以下教程创建一个启动项目:Creating and Running an Application Client on the GlassFish Server .我一步一步地创建了四个项目:JavaSE lib 来存储一个 EJB 远程接口(interface)、一个 EJB 模块以及本教程中描述的其他项目。

我的平台:

发行商 ID:Ubuntu 描述:Ubuntu 10.10 发行版:10.10
代号:特立独行

jdk1.6.0_26

Netbean7.2(Build 201207171143)

GlassFish 服务器 3+

我的远程界面

    package ejb.started;
    //    
    import javax.ejb.Remote;
    //
    @Remote
    public interface StartedSessionBeanRemote {

        String getHelloWorld();

    }

它的实现:

package ejb.started;
//
import javax.ejb.Stateless;
//
@Stateless(name="StartedSessionBeanRemote")
public class StartedSessionBean implements StartedSessionBeanRemote {

    @Override
    public String getHelloWorld() {
       return ("Hello world, EJB!");
    }

}

和客户端代码:

package startedentappclient;
//
import ejb.started.StartedSessionBeanRemote;
import javax.ejb.EJB;
//
public class AppClientMain {
    @EJB
    private static StartedSessionBeanRemote startedSessionBean;
    public static void main(String[] args) {
        System.err.println("EJB: "+startedSessionBean.getHelloWorld());
    }
}

当我尝试运行远程客户端项目时，我收到以下输出:

ant -f /home/ilya/Workspace/git/workspace/StartedEntAppClient -DforceRedeploy=false run
init:
EJBRemoteInterface.init:
Deleting: /home/ilya/Workspace/git/workspace/EJBRemoteInterface/build/built-jar.properties
EJBRemoteInterface.deps-jar:
Updating property file: /home/ilya/Workspace/git/workspace/EJBRemoteInterface/build/built-jar.properties
EJBRemoteInterface.compile:
EJBRemoteInterface.jar:
deps-jar:
compile:
library-inclusion-in-archive:
dist:
pre-run-deploy:
Redeploying /home/ilya/Workspace/git/workspace/StartedEntAppClient/dist/StartedEntAppClient.jar
Initializing...
post-run-deploy:
run-deploy:
Copying 1 file to /home/ilya/Workspace/git/workspace/StartedEntAppClient/dist
Copying 2 files to /home/ilya/Workspace/git/workspace/StartedEntAppClient/dist/StartedEntAppClientClient
Warning: /home/ilya/Workspace/git/workspace/StartedEntAppClient/dist/gfdeploy/StartedEntAppClient does not exist.
com.sun.enterprise.container.common.spi.util.InjectionException: Exception attempting to inject Remote ejb-ref name=startedentappclient.AppClientMain/startedSessionBean,Remote 3.x interface =ejb.started.StartedSessionBeanRemote,ejb-link=null,lookup=,mappedName=,jndi-name=ejb.started.StartedSessionBeanRemote,refType=Session into class startedentappclient.AppClientMain: Lookup failed for 'java:comp/env/startedentappclient.AppClientMain/startedSessionBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.url.pkgs=com.sun.enterprise.naming, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl}
    at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl._inject(InjectionManagerImpl.java:703)
    at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl.inject(InjectionManagerImpl.java:470)
    at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl.injectClass(InjectionManagerImpl.java:213)
    at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl.injectClass(InjectionManagerImpl.java:205)
    at org.glassfish.appclient.client.acc.AppClientContainer$ClientMainClassSetting.getClientMainClass(AppClientContainer.java:625)
    at org.glassfish.appclient.client.acc.AppClientContainer.getMainMethod(AppClientContainer.java:517)
    at org.glassfish.appclient.client.acc.AppClientContainer.completePreparation(AppClientContainer.java:411)
    at org.glassfish.appclient.client.acc.AppClientContainer.prepare(AppClientContainer.java:319)
    at org.glassfish.appclient.client.AppClientFacade.prepareACC(AppClientFacade.java:278)
    at org.glassfish.appclient.client.acc.agent.AppClientContainerAgent.premain(AppClientContainerAgent.java:82)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:323)
    at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:338)
Caused by: javax.naming.NamingException: Lookup failed for 'java:comp/env/startedentappclient.AppClientMain/startedSessionBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.url.pkgs=com.sun.enterprise.naming, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl} [Root exception is javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=startedentappclient.AppClientMain/startedSessionBean,Remote 3.x interface =ejb.started.StartedSessionBeanRemote,ejb-link=null,lookup=,mappedName=,jndi-name=ejb.started.StartedSessionBeanRemote,refType=Session' .  Actual (possibly internal) Remote JNDI name used for lookup is 'ejb.started.StartedSessionBeanRemote#ejb.started.StartedSessionBeanRemote' [Root exception is javax.naming.NamingException: Lookup failed for 'ejb.started.StartedSessionBeanRemote#ejb.started.StartedSessionBeanRemote' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.url.pkgs=com.sun.enterprise.naming, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl} [Root exception is javax.naming.NameNotFoundException: ejb.started.StartedSessionBeanRemote#ejb.started.StartedSessionBeanRemote 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:392)
    at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl._inject(InjectionManagerImpl.java:599)
    ... 15 more
Caused by: javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=startedentappclient.AppClientMain/startedSessionBean,Remote 3.x interface =ejb.started.StartedSessionBeanRemote,ejb-link=null,lookup=,mappedName=,jndi-name=ejb.started.StartedSessionBeanRemote,refType=Session' .  Actual (possibly internal) Remote JNDI name used for lookup is 'ejb.started.StartedSessionBeanRemote#ejb.started.StartedSessionBeanRemote' [Root exception is javax.naming.NamingException: Lookup failed for 'ejb.started.StartedSessionBeanRemote#ejb.started.StartedSessionBeanRemote' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.url.pkgs=com.sun.enterprise.naming, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl} [Root exception is javax.naming.NameNotFoundException: ejb.started.StartedSessionBeanRemote#ejb.started.StartedSessionBeanRemote not found]]
    at com.sun.ejb.EjbNamingReferenceManagerImpl.resolveEjbReference(EjbNamingReferenceManagerImpl.java:191)
    at com.sun.enterprise.container.common.impl.ComponentEnvManagerImpl$EjbReferenceProxy.create(ComponentEnvManagerImpl.java:1109)
    at com.sun.enterprise.naming.impl.GlassfishNamingManagerImpl.lookup(GlassfishNamingManagerImpl.java:776)
    at com.sun.enterprise.naming.impl.GlassfishNamingManagerImpl.lookup(GlassfishNamingManagerImpl.java:744)
    at com.sun.enterprise.naming.impl.JavaURLContext.lookup(JavaURLContext.java:169)
    at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:498)
    ... 18 more
Caused by: javax.naming.NamingException: Lookup failed for 'ejb.started.StartedSessionBeanRemote#ejb.started.StartedSessionBeanRemote' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.url.pkgs=com.sun.enterprise.naming, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl} [Root exception is javax.naming.NameNotFoundException: ejb.started.StartedSessionBeanRemote#ejb.started.StartedSessionBeanRemote 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:392)
    at com.sun.ejb.EjbNamingReferenceManagerImpl.resolveEjbReference(EjbNamingReferenceManagerImpl.java:186)
    ... 23 more
Caused by: javax.naming.NameNotFoundException: ejb.started.StartedSessionBeanRemote#ejb.started.StartedSessionBeanRemote 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.SerialContextProviderImpl.lookup(SerialContextProviderImpl.java:77)
    at com.sun.enterprise.naming.impl.RemoteSerialContextProviderImpl.lookup(RemoteSerialContextProviderImpl.java:109)
    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)
Java Result: 1
run:
BUILD SUCCESSFUL (total time: 11 seconds)

我无法假设这是什么问题。我在我的第二台 PC 上构建了相同的项目，并且一切都成功了。那一个具有相同的软件平台。

Answer 1

当你写:

@EJB
private static StartedSessionBeanRemote startedSessionBean;

您的客户尝试执行 injection那个EJB。在您的情况下，显然没有成功:

com.sun.enterprise.container.common.spi.util.InjectionException: Exception attempting to inject...

您可以通过使用 mappedName 构造来帮助自己。按以下方式重写这些代码行:

@Stateless(mappedName="ejb/StartedSessionBeanRemote")
public class StartedSessionBean implements StartedSessionBeanRemote {

和

@EJB(mappedName="ejb/StartedSessionBeanRemote")
private static StartedSessionBeanRemote startedSessionBean;

最后，确保您的 EJB 在客户端之前部署，因为没有 EJB 客户端无法注入(inject)它 :)