尝试在Netbeans 6.5 / windows xp中撤消远程方法时在RMI中遇到UnmarshalException ClassNotFoundException。 rmi客户端和服务器程序都在同一台机器上运行。
RMI客户端计划:
源代码位置
F:\ NewRMIClient \ SRC \ newrmiclient \ RMIClient.java
F:\ NewRMIClient \ SRC \ newrmiclient \ RemoteInterface.java
班级档案位置
F:\ NewRMIClient \建立\类\ newrmiclient \ RemoteInterface.class
F:\ NewRMIClient \建立\类\ newrmiclient \ RMIClient.class
建立JAR文件位置
F:\ NewRMIClient \ DIST \ NewRMIClient.jar
RemoteInterface.java
package newrmiclient;
import java.rmi.Remote; import java.rmi.RemoteException;
public interface RemoteInterface扩展了Remote { void sendMessageFilePath(String messagePath)抛出RemoteException; }
RMIClient.java
package newrmiclient;
import java.rmi.*;
import java.rmi.registry.*;
public class RMIClient
{
static public void main(String args[])
{
RemoteInterface rmiServer;
Registry registry;
String serverAddress="192.169.4.11";
String serverPort="3232";
String text="hello";
System.out.println("sending "+text+" to "+serverAddress+":"+serverPort);
System.setProperty("java.security.policy","file:/F:/PolicyFiles/rules.policy");
if(System.getSecurityManager() == null)
{
System.setSecurityManager(new RMISecurityManager());
}
try{
// get the “registry”
registry=LocateRegistry.getRegistry(serverAddress,(new Integer(serverPort)).intValue());
// look up the remote object
rmiServer=(RemoteInterface)(registry.lookup("MessagePath"));
// call the remote method
rmiServer.sendMessageFilePath(text);
}
catch(RemoteException e){
e.printStackTrace();
}
catch(NotBoundException e){
e.printStackTrace();
}
}
}
RMI服务器程序:
源代码位置
F:\ RMIProj \ SRC \ rmiproj \ RemoteInterface.java
F:\ RMIProj \ SRC \ rmiproj \ RmiServer.java
班级档案位置
F:\ RMIProj \建立\类\ rmiproj \ RemoteInterface.class
F:\ RMIProj \建立\类\ rmiproj \ RmiServer.class
F:\ RMIProj \建立\类\ rmiproj \ RmiServer_Skel.class
F:\ RMIProj \建立\类\ rmiproj \ RmiServer_Stub.class
建立JAR位置
RemoteInterface.java
package rmiproj;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface RemoteInterface extends Remote
{
void sendMessageFilePath(String messagePath) throws RemoteException;
}
RmiServer.java
package rmiproj;
import java.rmi.RMISecurityManager;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class RmiServer extends UnicastRemoteObject implements RemoteInterface
{
int thisPort = 3232;
Registry registry; // rmi registry for lookup the remote objects.
public RmiServer() throws RemoteException
{
try
{
System.setProperty("java.rmi.server.codebase","file:/F:/RMIProj/");
System.setProperty("java.rmi.server.hostname","RMIServer");
System.setProperty("java.security.policy","file:/F:/PolicyFiles/rules.policy");
if(System.getSecurityManager() == null)
{
System.setSecurityManager(new RMISecurityManager());
}
// create the registry and bind the name and object.
registry = LocateRegistry.createRegistry( thisPort );
registry.rebind("MessagePath", this);
}
catch(RemoteException re)
{
re.printStackTrace();
}
}
// This method is called from the remote client by the RMI.
// This is the implementation of the “RemoteInterface”.
public void sendMessageFilePath(String messageFilePath) throws RemoteException
{
System.out.println(messageFilePath);
}
public static void main(String args[]) throws RemoteException
{
RmiServer s=new RmiServer();
}
}
政策档案的位置: F:\ PolicyFiles \ rules.policy
rules.policy 授予{ permission java.security.AllPermission; };
尝试从客户端调用远程方法时,在控制台上抛出以下异常:
sending hello to 192.169.4.11:3232
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: rmiproj.RemoteInterface
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at newrmiclient.RMIClient.main(RMIClient.java:28)
Caused by: java.lang.ClassNotFoundException: rmiproj.RemoteInterface
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:711)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:655)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:592)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:628)
at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:294)
at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:238)
at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1531)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1493)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
请帮我解决此问题。
答案 0 :(得分:2)
您需要在客户端JVM中提供rmiproj.RemoteInterface
类。尝试在rmiproj.RemoteInterface
(或客户端类路径中包含的其他JAR)中包含NewRMIClient.jar
。
另请注意,您正在调用的远程Object实现rmiproj.RemoteInterface
而不是newrmiclient.RemoteInterface
。这意味着即使在客户端JAR中使用rmiproj.RemoteInterface
,您仍需要对代码进行一些工作。 rmiServer
必须是rmiproj.RemoteInterface
类型。