Java 绑定RMI服务时引发ServerException_Java_Exception_Rmi

Java 绑定RMI服务时引发ServerException

java exception

Java 绑定RMI服务时引发ServerException,java,exception,rmi,Java,Exception,Rmi,我正在尝试一步一步地将SimpleEcho服务器构建为RMI应用程序，正如Sun教程中所述所有源代码如下所示，非常简单： package test; import java.rmi.Remote; import java.rmi.RemoteException; public interface EchoServer extends Remote { public String sendString (String str) throws RemoteException;

我正在尝试一步一步地将SimpleEcho服务器构建为RMI应用程序，正如Sun教程中所述

所有源代码如下所示，非常简单：

package test;

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface EchoServer extends Remote {
    public String sendString (String str) throws RemoteException;        
}

我用rmic编译代码，看到文件EchoServerImpl_Stub.class。之后，我运行“rmiregistry”，然后启动RMIServer。这时我看到了ServerException：

java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: java.lang.ClassNotFoundException: test.EchoServerImpl_Stub at sun.rmi.server.UnicastServerRef.oldDispatch(Unknown Source) at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source) at sun.rmi.transport.Transport$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Unknown Source) at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255) at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233) at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:359) at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source) at java.rmi.Naming.rebind(Naming.java:160) at test.RMIServer.(RMIServer.java:10) at test.RMIServer.main(RMIServer.java:17) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90) Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: java.lang.ClassNotFoundException: test.EchoServerImpl_Stub at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source) at sun.rmi.server.UnicastServerRef.oldDispatch(Unknown Source) at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source) at sun.rmi.transport.Transport$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Unknown Source) at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.ClassNotFoundException: test.EchoServerImpl_Stub 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.ClassLoader.loadClassInternal(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) ... 12 more 我认为这是一个常见的问题，可能与错误的部署有关。如何修复它？

我想这是您的注册表类路径。test.EchoServer接口需要可供注册中心本身访问。在运行RMI注册表之前设置CLASSPATH环境变量，例如

此外，rmic是Java5之前的遗留问题。不再需要运行它了。只要正常运行服务器和客户端，代理就会动态创建

问候,， MK

除非您满足UnicastRemoteObject的Javadoc序言中提到的条件，否则必须运行rmic，而OP没有这样做。

package test;

import java.rmi.Naming;

public class RMIServer {

    public RMIServer () {
        try {
            EchoServer eServer = new EchoServerImpl ();
            Naming.rebind ("rmi://localhost:1099/EchoService", eServer); // <--exception
        } catch (Exception e) {
            e.printStackTrace ();
        }
    }

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

C:\>set CLASSPATH="MyBinFolder"
C:\>rmiregistry