Java RMI-ClassNotFound异常 [英] Java RMI - ClassNotFound exception

问题描述

我正在创建Java RMI程序，但是却收到ClassNotFoundException。
你们能帮我弄清楚吗？我正在使用Eclipse。
有人建议我这是一个代码库问题，但这有何关系？
以下是我的服务器和客户端的代码：

I'm creating a Java RMI program, but I'm getting a ClassNotFoundException. Could you guys help me figure it out? I'm using Eclipse. Somebody suggested me it was a codebase problem, but how does this relate? Here are the codes for my Server and Client:

服务器：

    package server;

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;

import base.Server;
import base.RmiStarter;

public class ServerImplStarter extends RmiStarter{

    public ServerImplStarter() {
        super(Server.class);
    }

    @Override
    public void doCustomRmiHandling() {
        try{
            Server engine = new ServerImpl();
            Server engineStub = (Server)UnicastRemoteObject.exportObject(engine, 0);


            Registry registry = LocateRegistry.createRegistry( 1099 );
            registry = LocateRegistry.getRegistry();
            registry.rebind("Server", engineStub);

        }catch(Exception e){
            e.printStackTrace();
        }

    }

    public static void main(String[] args){
        new ServerImplStarter();
    }

}

客户：

package client;

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

import base.RmiStarter;
import base.Server;
import base.Cell;

public class CellClient extends RmiStarter {

    public CellClient() {
        super(Server.class);
    }

    @Override
    public void doCustomRmiHandling() {
        try{
            Registry registry = LocateRegistry.getRegistry();
            Server server = (Server)registry.lookup("Server");

            Cell c = null;
            c = server.getcell();

        }catch(Exception e){
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        new CellClient();
    }

}

，错误是这样的：

java.rmi.UnmarshalException: error unmarshalling return; nested exception is: 
    java.lang.ClassNotFoundException: server.CellImpl
    at sun.rmi.server.UnicastRef.invoke(Unknown Source)
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(Unknown Source)
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(Unknown Source)
    at $Proxy0.getcell(Unknown Source)
    at client.CellClient.doCustomRmiHandling(CellClient.java:23)
    at base.RmiStarter.<init>(RmiStarter.java:19)
    at client.CellClient.<init>(CellClient.java:13)
    at client.CellClient.main(CellClient.java:31)
Caused by: java.lang.ClassNotFoundException: server.CellImpl
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at sun.rmi.server.LoaderHandler.loadClass(Unknown Source)
    at sun.rmi.server.LoaderHandler.loadClass(Unknown Source)
    at java.rmi.server.RMIClassLoader$2.loadClass(Unknown Source)
    at java.rmi.server.RMIClassLoader.loadClass(Unknown Source)
    at sun.rmi.server.MarshalInputStream.resolveClass(Unknown Source)
    at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
    at java.io.ObjectInputStream.readClassDesc(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    at sun.rmi.server.UnicastRef.unmarshalValue(Unknown Source)
    ... 8 more

推荐答案

两个客户端和服务器应具有相同的程序包名称。昨天我遇到了同样的错误，经过大量搜索后我更正了它。尝试一下并告诉我是否有其他错误。

Both client and server should have same package name. I had the same error yesterday, i corrected it after lots of searching. Try it and tell me if any other error comes.

如果找到，请标记为答案。谢谢！

Mark this as answer, if you find so.Thank You !!

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