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Thread: rmi problems

  1. #1
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    Default rmi problems

    i'm trying to create a basic hello world for rmi .

    server code:


    import java.net.InetAddress;
    import java.net.MalformedURLException;
    import java.net.UnknownHostException;
    import java.rmi.AlreadyBoundException;
    import java.rmi.Naming;
    import java.rmi.RMISecurityManager;
    import java.rmi.RemoteException;
    import java.rmi.server.UnicastRemoteObject;
     
     
    public class server extends UnicastRemoteObject implements dostuff{
     
    	protected server() throws RemoteException {
     
     
    	}
     
     
     
    	public static void main(String args[])
    	{
    		System.setSecurityManager(new RMISecurityManager());
     
    		try {
    			String computername=InetAddress.getLocalHost().getHostName();
    			server s = new server();
    			try {
    				Naming.bind("//"+computername+"/server", s);
    				System.out.println("server started");
    			} catch (MalformedURLException e) {
     
    				e.printStackTrace();
    			} catch (AlreadyBoundException e) {
     
    				e.printStackTrace();
    			}
    		} catch (RemoteException e) {
     
    			e.printStackTrace();
    		} catch (UnknownHostException e) {
     
    			e.printStackTrace();
    		}
    	}
     
     
     
    	@Override
    	public String doesitwork() {
     
    		return "yes";
    	}
     
    }

    interface:


    i
    mport java.rmi.*;
     
     
     interface dostuff extends Remote{
     
    	public String doesitwork() throws RemoteException;
     
    }


    i run the server in eclipse with VM arguments -Djava.rmi.server.codebase=${container_loc} -Djava.security.policy policy.txt. the policy just gives all permissions.

    i get the exception

    Java.rmi.unmarshalException Error unmarshalling return; nested exception is:
    java.net.malformedURLException: unknown protocol g
    etc.

    the external hard drive my java projects is on shows up as G:.

    what's the problem here?


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: rmi problems

    Looks like some code is eating a full path as a URL: G:\folder\subfolder\...
    URLs start with a protocol followed by a :
    so G:\ would look like protocol G

  3. #3
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    Default Re: rmi problems

    thought so. how can i fix this?

  4. #4
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    Default Re: rmi problems

    Where is it getting the G: from?

    Does the error message have a source code line number in it? the 'etc.' in your post probably showed it.

  5. #5
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    Default Re: rmi problems

    it's coming form the Naming.Bind() call, i think.

  6. #6
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    Default Re: rmi problems

    Why do you think that?
    Can you post ALL of the error message?

  7. #7
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    Default Re: rmi problems

    java.rmi.UnmarshalException: Error unmarshaling return; nested exception is:
    java.net.MalformedURLException: unknown protocol: g
    at sun.rmi.transport.StreamRemoteCall.executeCall(Unk nown Source)
    at sun.rmi.server.UnicastRef.invoke(Unknown Source)
    at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
    at java.rmi.Naming.bind(Unknown Source)
    at server.main(server.java:29)
    Caused by: java.net.MalformedURLException: unknown protocol: g
    at java.net.URL.<init>(Unknown Source)
    at java.net.URL.<init>(Unknown Source)
    at java.net.URL.<init>(Unknown Source)
    at sun.rmi.server.LoaderHandler.pathToURLs(Unknown Source)
    at sun.rmi.server.LoaderHandler.getDefaultCodebaseURL s(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(Unk nown Source)
    at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
    at java.io.ObjectInputStream.readClassDesc(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unkno wn Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    ... 5 more


    this is what showed up in the eclipse console

  8. #8
    Super Moderator Norm's Avatar
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    Default Re: rmi problems

    java.net.MalformedURLException: unknown protocol: g
    Did you ever resolve where the "g" was coming from?
    Are you using a disk (g:/)address instead of an http:// address?

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