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PORMI ClassNotFoundException
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copied!<p>Encountering UnmarshalException ClassNotFoundException in RMI while attempting to revoke Remote Method in Netbeans 6.5/windows xp. Both rmi client and server programs are running in the same machine.</p> <p><strong>RMI Client Program:</strong></p> <p>Source Code Location</p> <ul> <li><p>F:\NewRMIClient\src\newrmiclient\RMIClient.java</p></li> <li><p>F:\NewRMIClient\src\newrmiclient\RemoteInterface.java</p></li> </ul> <p>Class Files Location</p> <ul> <li><p>F:\NewRMIClient\build\classes\newrmiclient\RemoteInterface.class</p></li> <li><p>F:\NewRMIClient\build\classes\newrmiclient\RMIClient.class</p></li> </ul> <p>Built JAR File Location</p> <ul> <li><p>F:\NewRMIClient\dist\NewRMIClient.jar</p> <p>RemoteInterface.java</p> <p>package newrmiclient;</p> <p>import java.rmi.Remote; import java.rmi.RemoteException;</p> <p>public interface RemoteInterface extends Remote { void sendMessageFilePath(String messagePath) throws RemoteException; }</p></li> </ul> <p>RMIClient.java</p> <pre><code>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(); } } } </code></pre> <p><strong>RMI Server Program:</strong></p> <p>Source Code Location</p> <ul> <li><p>F:\RMIProj\src\rmiproj\RemoteInterface.java</p></li> <li><p>F:\RMIProj\src\rmiproj\RmiServer.java</p></li> </ul> <p>Class Files Location</p> <ul> <li><p>F:\RMIProj\build\classes\rmiproj\RemoteInterface.class</p></li> <li><p>F:\RMIProj\build\classes\rmiproj\RmiServer.class</p></li> <li><p>F:\RMIProj\build\classes\rmiproj\RmiServer_Skel.class</p></li> <li><p>F:\RMIProj\build\classes\rmiproj\RmiServer_Stub.class</p></li> </ul> <p>Built JAR Location</p> <ul> <li>F:\RMIProj\dist\RMIProj.jar</li> </ul> <p>RemoteInterface.java</p> <pre><code> package rmiproj; import java.rmi.Remote; import java.rmi.RemoteException; public interface RemoteInterface extends Remote { void sendMessageFilePath(String messagePath) throws RemoteException; } </code></pre> <p>RmiServer.java</p> <pre><code>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(); } } </code></pre> <p>Location of the policy file: F:\PolicyFiles\rules.policy</p> <p>rules.policy grant { permission java.security.AllPermission; };</p> <p>When attempting to invoke remote method from client, following exception is thrown on console:</p> <pre><code>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) </code></pre> <p>Please help me to resolve this issue.</p>

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