RMI "UnmarshalException" issue

Question

Hi,
I am doing a sample RMI application in the following step by step process but in the *8th* step I am getting exception so please kindly resolve my issue.
Step-1: creating “Service interface”
          AddServiceInterface.java
          ====================
import java.rmi.*;
public interface AddServiceInterface extends Remote
     public int add(int a, int b) throws RemoteException;
Step-2: Compiling “Service interface”
D:\BAJI\Programs\JAVA\rmi\rmi_server>javac AddServiceInterface.java
D:\BAJI\Programs\JAVA\rmi\rmi_server>
Step-3: creating the Service interface implementation class
               AddService.java
               ============
import java.rmi.*;
import java.rmi.server.*;
public class AddService extends UnicastRemoteObject implements AddServiceInterface
     public AddService() throws Exception
     public int add(int a, int b) throws RemoteException
          return (a+b);
Step-4: Compiling the “Service interface” implementation class
D:\BAJI\Programs\JAVA\rmi\rmi_server>javac AddService.java
D:\BAJI\Programs\JAVA\rmi\rmi_server>
Step-5: Start the RMI service
1)openned a new command prompt and typed the following command
2)d:\> rmiregistry
Step-6: Create stub and skeleton classes
D:\BAJI\Programs\JAVA\rmi\rmi_server>rmic AddService
D:\BAJI\Programs\JAVA\rmi\rmi_server>
Step-7: Create RMI Server Application which export the Server object into Naming service
RMIServerApp.java
===============
import java.rmi.*;
public class RMIServerApp
     public static void main(String[] args) throws Exception
          AddServiceInterface asi = new AddService();
          Naming.bind("rmi://localhost/as",asi);
          System.out.println("\n\n***************** Registored into Naming Service ****************\n\n");
Step-8: Compiling & execute
D:\BAJI\Programs\JAVA\rmi\rmi_server>javac RMIServerApp.java
D:\BAJI\Programs\JAVA\rmi\rmi_server>java RMIServerApp
Exception in thread "main" java.rmi.ServerException: RemoteException occurred in
server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested excep
tion is:
java.lang.ClassNotFoundException: AddServiceInterface
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:385
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
at sun.rmi.transport.Transport$1.run(Transport.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:4
66)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport
.java:707)
at java.lang.Thread.run(Thread.java:595)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Stream
RemoteCall.java:247)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:
223)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:343)
at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
at java.rmi.Naming.bind(Naming.java:111)
at RMIServerApp.main(RMIServerApp.java:8)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested ex
ception is:
java.lang.ClassNotFoundException: AddServiceInterface
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:375
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
at sun.rmi.transport.Transport$1.run(Transport.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:4
66)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport
.java:707)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.ClassNotFoundException: AddServiceInterface
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:242)
at sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:7
07)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:651)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:588)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:6
28)
at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:294
at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStrea
m.java:238)
at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1500)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1463)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
699)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
... 9 more
Step-9: Create the “client object” file
               RMIClient.java
               ===========
import java.rmi.*;
public class RMIClient
     public static void main(String[] args) throws Exception
          AddServiceInterface asi = (AddServiceInterface)Naming.lookup("rmi://localhost/as");
          System.out.println(asi.add(10,20));
Thanks & Regards,
BSK

Answer 1

The registry cannot find the class named in the exception.