这是我第一次使用 java Rmi*。我有一个自定义类,它扩展UnicastRemoteObject
并实现了一个扩展远程的接口。我认为我已经在类中正确实现了接口的方法,但是IllegalArgumentException
当我尝试运行我的代码时仍然得到一个(它是关于一个没有参数的方法)。
jvm 声称遇到了非法的远程方法,但该方法及其实现对我来说似乎很好。
除了错误地实现或调用该方法之外,是否还有其他可能导致此异常的原因?
这是堆栈跟踪:
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.<init>(Unknown Source)
at java.rmi.server.UnicastRemoteObject.<init>(Unknown Source)
at NodeImpl.<init>(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
这是界面:
import java.rmi.*;
import java.util.LinkedList;
interface Node extends Remote
{
public boolean isAlive();
public LinkedList<NodeImpl> getLeafNodes();
public LinkedList<NodeImpl> 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();
}
这是该类的构造函数:
public NodeImpl() throws RemoteException
{
super();
l=4;
M=1;
nodeId=new byte [16];
Random r=new Random();
r.nextBytes(nodeId);
leafNodes=new LinkedList<NodeImpl>();
connected=false;
ng=new NodeGUI(this);
for(int i=0;i<l;i++)
{
leafNodes.add(null);
}
neighborhoodList=new LinkedList<NodeImpl>();
anyNodeWhoAnswered=new LinkedList<byte []>();
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();
}