这是我第一次使用java Rmi *。我有一个自定义类，它扩展了UnicastRemoteObject并实现了扩展远程的接口。我认为我已经在类中正确实现了接口的方法，但我仍然得到一个IllegalArgumentException当我尝试运行我的代码(它是一个没有参数的方法)。

jvm声称遇到了一个非法的远程方法，但是该方法及其实现对我来说似乎很好。

是否有任何其他原因导致此异常可能发生，除非实现或调用方法错误？

这里是堆栈跟踪：

SEVERE: null

java.rmi.server.ExportException: remote object implements illegal remote interface; nested exception is:

java.lang.IllegalArgumentException: illegal remote method encountered: public abstract java.lang.String Node.getId()

at sun.rmi.server.UnicastServerRef.exportObject(Unknown Source)

at java.rmi.server.UnicastRemoteObject.exportObject(Unknown Source)

at java.rmi.server.UnicastRemoteObject.exportObject(Unknown Source)

at java.rmi.server.UnicastRemoteObject.(Unknown Source)

at java.rmi.server.UnicastRemoteObject.(Unknown Source)

at NodeImpl.(NodeImpl.java:30)

at NodeLauncher.main(NodeLauncher.java:11)

Caused by: java.lang.IllegalArgumentException: illegal remote method encountered: public abstract java.lang.String Node.getId()

at sun.rmi.server.Util.checkMethod(Unknown Source)

at sun.rmi.server.Util.getRemoteInterfaces(Unknown Source)

at sun.rmi.server.Util.getRemoteInterfaces(Unknown Source)

at sun.rmi.server.Util.createProxy(Unknown Source)

... 7 more

这里是界面：

import java.rmi.*;

import java.util.LinkedList;

interface Node extends Remote

{

public boolean isAlive();

public LinkedList getLeafNodes();

public LinkedList getNeighborhoodList();

public String [] getRoutingTable();

public NodeImpl initiation(String credentials,Object application);

public String route(String message,String key);

public void inform(byte [] id);

public String getId();

public boolean isConnected();

public void applicationClose();

public boolean distanceMeasure();

}

这里是类的构造函数：

public NodeImpl() throws RemoteException

{

super();

l=4;

M=1;

nodeId=new byte [16];

Random r=new Random();

r.nextBytes(nodeId);

leafNodes=new LinkedList();

connected=false;

ng=new NodeGUI(this);

for(int i=0;i

{

leafNodes.add(null);

}

neighborhoodList=new LinkedList();

anyNodeWhoAnswered=new LinkedList();

it=new InformingTimer(this);

Thread informingTimerThread=new Thread(it);

informingTimerThread.start();

try

{

Naming.rebind("rmi://" + "localhost" + ":1099/"+nodeId, this);

}

catch (Exception ex)

{

Logger.getLogger(NodeImpl.class.getName()).log(Level.SEVERE, null, ex);

}

bootstrap();

}