Question

我在EJB 3.0中使用Jboss 5创建了一个helloworld应用程序。当我尝试运行我的客户端类EjbClientApplication时，它会引发异常。

我经常遇到异常。我已经做了很多关于它的事情，但我找不到它，因为我是EJB的新手，请帮忙。

例外：

javax.naming.CommunicationException：无法获取连接任何这些网址：localhost：1099并且发现失败并显示错误： javax.naming.CommunicationException：接收超时[Root exception 是java.net.SocketTimeoutException：接收超时] [Root 异常是javax.naming.CommunicationException：连接失败到服务器localhost / 127.0.0.1:1099 [root例外是 javax.naming.ServiceUnavailableException：无法连接到服务器 localhost / 127.0.0.1:1099 [根异常是java.net.ConnectException：拒绝连接：连接]]] org.jnp.interfaces.NamingContext.checkRef（NamingContext.java:1763）at at org.jnp.interfaces.NamingContext.lookup（NamingContext.java:693）at at org.jnp.interfaces.NamingContext.lookup（NamingContext.java:686）at at javax.naming.InitialContext.lookup（InitialContext.java:392）at com.hex.client.EjbClientApplication.main（EjbClientApplication.java:28）引起：javax.naming.CommunicationException：连接失败 server localhost / 127.0.0.1:1099 [root例外是 javax.naming.ServiceUnavailableException：无法连接到服务器 localhost / 127.0.0.1:1099 [根异常是java.net.ConnectException：连接被拒绝：连接]] org.jnp.interfaces.NamingContext.getServer（NamingContext.java:335）at at org.jnp.interfaces.NamingContext.checkRef（NamingContext.java:1734）... 4更多引起：javax.naming.ServiceUnavailableException：失败连接到服务器localhost / 127.0.0.1:1099 [根异常是 java.net.ConnectException：连接被拒绝：连接] at org.jnp.interfaces.NamingContext.getServer（NamingContext.java:305）... 5更多引起：java.net.ConnectException：拒绝连接：在java.net.PlainSocketImpl.socketConnect（Native Method）连接 java.net.PlainSocketImpl.doConnect（PlainSocketImpl.java:351）at java.net.PlainSocketImpl.connectToAddress（PlainSocketImpl.java:213）at java.net.PlainSocketImpl.connect（PlainSocketImpl.java:200）at java.net.SocksSocketImpl.connect（SocksSocketImpl.java:366）at java.net.Socket.connect（Socket.java:529）at org.jnp.interfaces.TimedSocketFactory.createSocket （TimedSocketFactory.java:97）at org.jnp.interfaces.TimedSocketFactory.createSocket （TimedSocketFactory.java:82）at org.jnp.interfaces.NamingContext.getServer（NamingContext.java:301）... 另外5个

Jboss服务器端口127.0.0.1:10001，但是我试图点击这个网址127.0.0.1:1099是这个ryt？

服务器属性：

地址：127.0.0.1
端口：8080
JNDI端口：1099

MyCode：这些代码包含在单个EJB项目中

RemoteInterfaceClass：

package com.hex.statelessbean;

import javax.ejb.Remote;

@Remote

public interface StatelessSessionBeanRemote {

    public String displayMessage();
 }

StatelessBean：

/**
 * Session Bean implementation class StatelessSessionBean
 */

 package com.hex.statelessbean;

 import javax.ejb.Stateless;

@Stateless

public class StatelessSessionBean implements StatelessSessionBeanRemote {

/**
 * Default constructor. 
 */
public StatelessSessionBean() {
    // TODO Auto-generated constructor stub
}

@Override
public String displayMessage() {
    // TODO Auto-generated method stub
    return "Hello world";
}

}

客户端：

package com.hex.client;

import java.util.Properties;

import javax.naming.InitialContext;
import javax.naming.NamingException;

import com.hex.statelessbean.StatelessSessionBeanRemote;

public class EjbClientApplication {

public static void main(String[] args) {
    try {
    Properties props = new Properties();
    props.setProperty("java.naming.factory.initial",
    "org.jnp.interfaces.NamingContextFactory");
    props.setProperty("java.naming.factory.url.pkgs",
    "org.jboss.naming");
    props.setProperty("java.naming.provider.url", "localhost:1099");

    InitialContext ctx = new InitialContext(props);
    StatelessSessionBeanRemote bean = (StatelessSessionBeanRemote) ctx
    .lookup("StatelessSessionBean/remote");
    System.out.println("Message from Bean :" + bean.displayMessage());
    } catch (NamingException e) {
    e.printStackTrace();
    }

    }
}

Answer 1

更改localhost:1099 to jnp://localhost:1099和org.jboss.naming to org.jboss.naming:org.jnp.interfaces并检查ejb的名称。使用注释@RemoteBinding，您可以为ejb命名。你有端口偏移吗？

Answer 2

    Corrected Code:

    **Interface class:**


    package com.hex.statelessbean;

    import javax.ejb.Remote;

    @Remote
    public interface StatelessSessionBeanRemote {

        public String displayMessage();
    }


    **Stateless Bean class:**

    package com.hex.statelessbean;

    import javax.ejb.Stateless;

    /**
     * Session Bean implementation class StatelessSessionBean
     */
    @Stateless
    public class StatelessSessionBean implements StatelessSessionBeanRemote {

        /**
         * Default constructor. 
         */
        public StatelessSessionBean() {
            // TODO Auto-generated constructor stub
            System.out.println("************* Calling from Default constructor ******************");
        }

        @Override
        public String displayMessage() {
            // TODO Auto-generated method stub
            System.out.println("************* Calling from displayMessage() ******************");
            return "Hello world";
        }

    }


**Client class:**


package com.hex.client;

import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import com.hex.statelessbean.StatelessSessionBeanRemote;

public class EjbClientApplication {

    /**
     * @param args
     * @throws NamingException
     */

    public static void main(String[] args) {
        try {
            Properties properties = new Properties();
            properties.setProperty("java.naming.factory.initial",
                    "org.jnp.interfaces.NamingContextFactory");
            properties.setProperty("java.naming.factory.url.pkgs",
                    "org.jboss.naming:org.jnp.interfaces");
            properties.setProperty("java.naming.provider.url",
                    "jnp://localhost:1099");
        InitialContext ctx = new InitialContext(properties);
        StatelessSessionBeanRemote bean = (StatelessSessionBeanRemote) ctx
        .lookup("StatelessSessionBean/remote");
        System.out.println("Message from Bean :" + bean.displayMessage());
        } catch (NamingException e) {
        e.printStackTrace();
        }
        }
}


**LookUp:**

Message from Bean :Hello world

运行客户端类时EJB项目中的CommunicationException：无法获取与以下任何URL的连接：localhost：1099

2 个答案: