如何使用独立程序访问EJB 2.0

Question

我正在使用Eclipse和Jboss开发EJB2.0项目。下面是代码示例：

package com.example.ejb;

import javax.ejb.*;
import java.rmi.RemoteException;

public interface Advice extends EJBObject {

    public String getAdvice() throws RemoteException;
}

package com.example.ejb;

import java.rmi.RemoteException;

import javax.ejb.*;

public interface AdviceHome extends EJBHome {

    public Advice create() throws CreateException, RemoteException;
}

package com.example.ejb;

import java.rmi.RemoteException;

import javax.ejb.*;

public class AdviceBean implements SessionBean {


private static final long serialVersionUID = 1L;

private String[] adviceStrings = {"One word: inappropriate.", 
           "You mightwant to    rethink that haricut.", "Your boss will respect "};

    public void ejbPassivate() {

            System.out.println("ejb activate");
    }

    public void ejbRemove() {

            System.out.println("ejb remove");

    }

    public void setSessionContext(SessionContext ctx) {

            System.out.println("session context");

    }

    public String getAdvice() {

            System.out.println("in get advice");

            int random = (int) (Math.random() * adviceStrings.length);
            return adviceStrings[random];
    }

    public void ejbCreate() {

            System.out.println("in get create");
    }

    public void ejbActivate() throws EJBException, RemoteException {
        System.out.println("in ejbActivate");

    }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"       
"http://java.sun.com/dtd/ejb-jar_2_0.dtd">

<ejb-jar id="ejb-jar_ID">
<display-name>Ejb1</display-name>

<enterprise-beans>  
<session>
   <display-name>AdviceBean</display-name>
   <ejb-name>AdviceBean</ejb-name>
   <home>com.example.ejb.AdviceHome </home>
   <remote>com.example.ejb.Advice</remote>
   <ejb-class>com.example.ejb.AdviceBean</ejb-class>
   <session-type>Stateless</session-type>
   <transaction-type>Bean</transaction-type>
   <security-identity>
     <description></description>
     <use-caller-identity></use-caller-identity>
   </security-identity>
 </session>  
</enterprise-beans>
<ejb-client-jar>EJBProjectClient.jar</ejb-client-jar>
</ejb-jar>

09:33:50,273 INFO[org.jboss.as.ejb3.deployment.processors.ejbJNDIBindingsDeploymentUnitProcessor]（MSC service thread 1-3）部署单元部署“ejbProject1.jar”中名为AdviceBean的会话bean的JNDI绑定如下：

java:global/EJBProject1/AdviceBean!com.example.ejb.Advice
java:app/EJBProject1/AdviceBean!com.example.ejb.Advice
java:module/AdviceBean!com.example.ejb.Advice
java:jboss/exported/EJBProject1/AdviceBean!com.example.ejb.Advice
java:global/EJBProject1/AdviceBean!com.example.ejb.AdviceHome
java:app/EJBProject1/AdviceBean!com.example.ejb.AdviceHome
java:module/AdviceBean!com.example.ejb.AdviceHome
java:jboss/exported/EJBProject1/AdviceBean!com.example.ejb.AdviceHome

09:33:50,299 INFO[org.jboss.as.ejb3.deployment.processors.ejbJNDIBindingsDeploymentUnitProcessor]（MSC service thread 1-2）部署“EnterpriseApplicationProject.ear”的部署单元子部署“ejbProject.jar”中名为AdviceBean的会话bean的JNDI绑定如下：

java:global/EnterpriseApplicationProject/EJBProject/AdviceBean!com.example.ejb.Advice
java:app/EJBProject/AdviceBean!com.example.ejb.Advice
java:module/AdviceBean!com.example.ejb.Advice
java:jboss/exported/EnterpriseApplicationProject/EJBProject/AdviceBean!com.example.ejb.Advice
java:global/EnterpriseApplicationProject/EJBProject/AdviceBean!com.example.ejb.AdviceHome
java:app/EJBProject/AdviceBean!com.example.ejb.AdviceHome
java:module/AdviceBean!com.example.ejb.AdviceHome
java:jboss/exported/EnterpriseApplicationProject/EJBProject/AdviceBean!com.example.ejb.AdviceHome

package com.example.localclient;

import javax.naming.*;
import java.rmi.*;
import javax.rmi.*;
import javax.ejb.*;

import com.example.ejb.Advice;
import com.example.ejb.AdviceHome;

@SuppressWarnings("unused")
public class AdviceClient {

public static void main(String[] args) throws Exception {
    new AdviceClient().go();

}

public void go() throws Exception{

    Context ic = new InitialContext();
    Object o = ic.lookup("java:jboss/exported/EJBProject1/AdviceBean");
    AdviceHome home = (AdviceHome) PortableRemoteObject.narrow(o, AdviceHome.class);
    Advice advisor = home.create();
    System.out.println(advisor.getAdvice());
}

}

线程“main”javax.naming.noInitialContextException中的异常：需要在环境或系统属性中指定类名，或者作为applet参数，或者在应用程序资源文件中指定类名：在javax.naming.spi.namingManager.getInitialContext(namingManager.java:662)在javax.naming.initialContext.getDefaultinitCTX(initialContext.java:307)在javax.naming.initialContext.java:344)在(AdviceClient.java:24)位于com.example.localclient.adviceClient.main(AdviceClient.java:17)

似乎无法找到JNDI名称，我尝试了JNDI名称的各种组合，这些组合是在JBoss开始时看到的（这些信息在上面很少几段）。

我需要一些信息，我做了谷歌，但仍然面临同样的问题。

1）我必须在独立客户机中提供的JNDI名称是什么？

谢了！

Answer 1

您的客户机代码运行在不同的JVM中，而不是服务器的JVM中。

你需要的很简单。您需要修改代码，以使用服务器的属性而不是本地属性启动初始上下文。

有关如何做到这一点的更多细节，请参见此链接：http://docs.oracle.com/javase/jndi/tutorial/basics/prepare/initial.html

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