Question

JAVA RMI无法远程调用

我把一个RMI的CLIENT调用类放在SERVER的工程里执行可以正常调用，但是如果把它拷到一个新项目中却无法执行，代码如下：
Java code
//服务器代码
package server;

import java.rmi.Remote;

import java.rmi.RemoteException;

public interface SayHello extends Remote {// 需要从Remote继承

public String sayHello(String info) throws RemoteException; // 需要抛出remote异常n;

}

package server;

import java.rmi.RemoteException;

import java.rmi.server.UnicastRemoteObject;

public class SayHelloImpl extends UnicastRemoteObject implements SayHello {

protected SayHelloImpl() throws RemoteException {

super();

// TODO Auto-generated constructor stub

}

public String sayHello(String info) throws RemoteException {

return "hello=" + info;

}

}

package server;

import java.rmi.*;

import java.net.*;

public class SayRmiServer {

public SayRmiServer() {

}

public static void main(String args[]) throws RemoteException,
MalformedURLException {

SayHelloImpl add = new SayHelloImpl();

Naming.rebind("RMI_Test_2", add);

}

}

//客户端代码，接口文件就不重复拷了
package client;

import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;

import server.SayHello;

public class SayRmiClient {

public SayRmiClient() {

}

public static void main(String args[]) throws RemoteException,

MalformedURLException, NotBoundException {

String url = "rmi://110.64.89.140" +
"/RMI_Test_2";
SayHello add = (SayHello) Naming.lookup(url);

String result = add.sayHello("hubin");

System.out.println(result);

}
}

执行后抛出如下异常：
Exception in thread "main" java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: server.SayHello (no security manager: RMI class loader disabled)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at java.rmi.Naming.lookup(Unknown Source)
at client.SayRmiClient.main(SayRmiClient.java:22)
Caused by: java.lang.ClassNotFoundException: server.SayHello (no security manager: RMI class loader disabled)
at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(Unknown Source)
at java.rmi.server.RMIClassLoader.loadProxyClass(Unknown Source)
at sun.rmi.server.MarshalInputStream.resolveProxyClass(Unknown Source)
at java.io.ObjectInputStream.readProxyDesc(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)
... 3 more

Answer 1

java.lang.ClassNotFoundException: server.SayHello (no security manager: RMI class loader disabled)

缺少jar包，异常显示是缺少server.SayHello这个方法，确认新项目中是不是少了jar包。