I am having a problem setting up a simple RMI server, and was wondering if someone can point me in the right direction.
I have a simple class, Server, that should export an simple interface. Currently when I try and run the server class, I get the following exception:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: prototype.ISimpleService
I have already made sure that the rmi registry is running, by running the “start rmiregistry” command, and I am running the service with the following argument
-Djava.rmi.server.codebase=file:C:/Users/John/Documents/NetBeansProjects/Prototype/build/classes
The path in the argument above points to the top level folder of my class hierarchy, so:
/classes
/prototype
->ISimpleService.class
->SimpleServiceImpl.class
->IServer.class
Here is my server code:
public class Server
{
private static ISimpleService service;
public static void main(String[] args)
{
service = new SimpleServiceImpl();
try
{
ISimpleService stub = (ISimpleService) UnicastRemoteObject.exportObject(service, 0);
Registry registry = LocateRegistry.getRegistry();
registry.rebind("SimpleService", stub);
System.out.println("Simple Service bound");
}
catch (Exception ex)
{
System.out.println("Exception binding the simple service");
ex.printStackTrace();
}
}
}
I have looked at the Java RMI trail, and adapted my simple example to follow that, although I am not using security/permissions that I shouldn’t need as I have gotten an RMI example working before without that stuff…
So I believe I have to missing something simple(no pun intended), to make this work, but I cant see anything at the moment.
Do anyone have an ideas?
Here is the full stack trace:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: prototype.ISimpleService
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:396)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)
at sun.rmi.transport.Transport$1.run(Transport.java:159)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask (ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
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 prototype.Server.main(Server.java:35)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: prototype.ISimpleService
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:386)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)
at sun.rmi.transport.Transport$1.run(Transport.java:159)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask (ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.ClassNotFoundException: prototype.ISimpleService
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
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:1530)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1492)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
... 12 more
I have solved this issue… Took me alittle longer than I expected though 🙁
Turns out when you use a codebase argument like I had done, you should place a trailing “/” at the end, if you are pointing to a directory. Once I added that in, my server successfully binds.
For a resource on this p see http://download.oracle.com/javase/1.4.2/docs/guide/rmi/codebase.html#section6