RMI Excpetion

Hi guys, I already works with RMI another times, but I don't know why the program is not working properly.
I have a very simple program and I am trying to start and test the rmi server object, but when I try to do the Naming.bind the follow exception is throws:
java.rmi.ServerException: Server RemoteException; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: StockControlServerInterfaceImpl_Stub
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.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.rebind(Unknown Source)
at java.rmi.Naming.rebind(Naming.java:160)
at TestClass.main(TestClass.java:23)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: StockControlServerInterfaceImpl_Stub
Caused by: java.lang.ClassNotFoundException: StockControlServerInterfaceImpl_Stub
ps: I am sure it my interface extends Remote and my server exnteds UnicastRemoteObject, and I am sure that my stub class was generated using rmic compiler and it is in the same path at the "main" method.
Someone know how to fix it?!!? Thanks
Thanks

Hi guys, I am here again, I was reading another posts and try to find a solution for this problem but this is really complicated. Here is my source code
try{
            System.out.println("Starting the StockControlServerInterface...");
            StockControlServerInterfaceImpl stockControlServer = new StockControlServerInterfaceImpl();
            Naming.rebind("//localhost/Stock", stockControlServer);
            System.out.println("StockControlServerInterface was up and running.");           
        }//end try
        //catch(ClassNotFoundException cnfe){
        //    cnfe.printStackTrace();
        //}//end catch
        catch(RemoteException re){
            re.printStackTrace();
        }//End catch       
        catch(MalformedURLException mue){
            mue.printStackTrace();
        }//end catchI get the error when try to rebind/bind the server. I already try everything, use the java.rmi.server.codebase set the directory on CLASSPATH, start the rmiregistry at the same dir but NOTHING works, please HELP!!!!

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    Thank you very much for any help or reference.
    Jipe

    Multiple JVMs dont have any inherent special behavior on the same maching. However, you must consider the shared resources of that machine such as ports and files that may be contended for.
    The only advantage of multiple JVMs of single JVMs is an OS one. The JVMs are separate processes and as such if one crashes it will not bring the other down.
    If you want to transfer user sessions from one JVM to another, no matter if on the same computer or not, you will need an architecture to support this. That is where application servers come in. Some of them will allow you to do this. So if you design your product to run in an application server, you have a lot of room to expand. That is really the benefit of designing for an application server.
    The details of a shared session are likely very complicated. You will have to ask the application server folks about that. Maybe go over to the JBoss forums.

  • What is the difference between RMI and JAX-RPC?

    Dear All
    First of all my understanding of RMI and JAX-RPC:
    RMI is JAVA only version of RPC. It can't talk to any other language.
    JAX-RPC is a part of JWSDP and if you implement your client and server with JAX-RPC, client written in any language can talk with JAX-RPC implementation.
    What else makes them different and am I right with my understanding?
    Finally, I would like to develop clients which will have a java class, say httpserver.java, which will act like a http server, listens to a http port. Now, Two such client will run in two different PC and I want to call a module from one client to another which should be accessible via my httpserver.java. For that which should be my choice RMI or JAX-RPC? Can I achive it with http get-post method, as I am expecting to read some value of variables from one client to the another.
    Say class A has variable a, aa, aaa and clas B has variable b, bb, bbb. Now I want to read the value of b, bb, bbb from class A. How do I do that when class B is listening to a http port with my httpserver.java class.
    Lastly, say B is listening to a http port and I want to send a file to B from A. How can I do that? Remember, B didn�t ask for that. How can A send a file to B when B is listening to a http port with my httpserver.java.
    With regards
    Mohammed Jubaer Arif
    Mobile: +61-0411215302
    Personal Web: http://www.geocities.com/jubairarifctg/
    Org. Web.: http://www.geocities.com/halimschamber/

    simply put, RMI allows you to (semi) transparently treat remote objects as if they were local, and your distributed application can be written (more or less) like a "normal" java app. Sockets just give you a "raw" connection to work with, and you get to build up your application from that.
    I hope that helped
    Lee

  • RMI : error on JRE 1.6 but not on JRE 1.5 ???

    Hello,
    I've got a problem with my application since i use JRE 1.6
    My application run perfectly with JRE 1.5 !!!
    My code is first :
    LocateRegistry.createRegistry(port);
    NamingManager.setInitialContextFactoryBuilder(new InitialServerContextFactory());
    NamingManager.getInitialContext(environment);(with environment is an hastable containing HOST et PORT)
    An next, i have a Java Class witch impl�ments Context :
    public class InitialServerContext implements Context
        public void bind(String name, Object obj) throws NamingException
              getRMIContext().bind("rmi://" + mServer + ':' + mPort + '/' + name, obj);
        static Context getRMIContext() throws NamingException
              return NamingManager.getURLContext("rmi", null);
    The error on JRE 1.6 is on the line :
    getRMIContext().bind("rmi://" + mServer + ':' + mPort + '/' + name, obj);
    _Exception is
    :_java.lang.NullPointerException
    at com.sun.jndi.rmi.registry.RegistryContext.<init>(Unknown Source)
    at com.sun.jndi.url.rmi.rmiURLContext.getRootURLContext(Unknown Source)
    at com.sun.jndi.toolkit.url.GenericURLContext.bind(Unknown Source)
    at com.xxx.aes.naming.InitialServerContext.bind(InitialServerContext.java:231)
    at com.xxx.aes.naming.InitialServerContextFactory.getInitialContext(InitialServerContextFactory.java:104)
    at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
    at com.xxx.aes.server.NamingServer.start(NamingServer.java:65)
    What is the difference between JRE 1.5 and 1.6 ?
    Why my application in 1.6 is not correct ?
    If necessary, i can give you my Java Class InitialServerContextFactory.java
    Thanks a lot for your responses.

    Hello,
    I tired this approach you mentioned, and interestingly if i just make ejb calls without any event handling, meaning if i call them separately they all just work fine and i see the results coming back from server. But when i relate them to any click events the whole IE freezes.
    One more thing i noted is that, seems like the way JRE 1.6 render my applet is somewhat different than JRE 1.5.* familiy,because initially when my aplet is loaded, i see everything which should be displayed from the first screen, but any further operations i cannot perform, even opening a file chooser from tool bar. I admit my applet is real heavy and it contains a lot of data in it on the first screen, may be its the heap size causing the problem in 1.6 but fine with jre 1.5.
    Day by day am coming to conlusion that jre 1.6 is my concern now ..:(
    Thanks,

  • Urgent Help Required For Starting RMI server from servlet.

    I am currently working on rmi project.
    I want to send request to remote machine(Web host) where my application is from desktop client .For that we are using RMI.
    I am writing servlet and inside it i am binding object to registry for rmi server.
    which will be deployed on remote server.
    code ....
    Registry reg;
    reg=LocateRegistry.createRegistry(1099);
    Server server=new Server("server");//class whose remote object to be accessed
    //extends unicast remote object.Implement ServerInt interface which extends Remote.
    reg.bind("server",server);
    When i am trying to access this object i am getting following exception.
    javax.naming.CommunicationException [Root exception is java.rmi.UnmarshalExcepti
    on: error unmarshalling return; nested exception is:
            java.lang.ClassNotFoundException: ServerModule.ServerInt]
    at com.sun.jndi.rmi.registry.RegistryContext.lookup(Unknown Source)
    at com.sun.jndi.toolkit.url.GenericURLContext.lookup(Unknown Source)
    at javax.naming.InitialContext.lookup(Unknown Source)
    at RequstReplication.main(RequstReplication.java:27)
    Caused by: java.rmi.UnmarshalException: error unmarshalling return; nested excep
    tion is:
    java.lang.ClassNotFoundException: ServerModule.ServerInt
    at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
    ... 4 more
    Caused by: java.lang.ClassNotFoundException: ServerModule.ServerInt
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at sun.rmi.server.LoaderHandler.loadProxyInterfaces(Unknown Source)
    at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
    at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
    at java.rmi.server.RMIClassLoader$2.loadProxyClass(Unknown Source)
    at java.rmi.server.RMIClassLoader.loadProxyClass(Unknown Source)
    at sun.rmi.server.MarshalInputStream.resolveProxyClass(Unknown Source)
    at java.io.ObjectInputStream.readProxyDesc(Unknown Source)
    at java.io.ObjectInputStream.readClassDesc(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    ... 5 more
    I can access naming enumeration of registry and object bound to it.
    by following program.I shows corect objects.
    Context namingContext=new InitialContext();
    NamingEnumeration<NameClassPair> e=namingContext.list("rmi:");
    while(e.hasMore())
    System.out.println(e.next().getName());
    While when i start RMI server from simple java program i can access these objects from registry.
    I am not getting what is problem problem.Is there any other way to send request?
    Plese give quick response.

    I am currently working on rmi project.
    I want to send request to remote machine(Web host) where my application is from desktop client .For that we are using RMI.
    I am writing servlet and inside it i am binding object to registry for rmi server.
    which will be deployed on remote server.
    code ....
    Registry reg;
    reg=LocateRegistry.createRegistry(1099);
    Server server=new Server("server");//class whose remote object to be accessed
    //extends unicast remote object.Implement ServerInt interface which extends Remote.
    reg.bind("server",server);
    When i am trying to access this object i am getting following exception.
    javax.naming.CommunicationException [Root exception is java.rmi.UnmarshalExcepti
    on: error unmarshalling return; nested exception is:
            java.lang.ClassNotFoundException: ServerModule.ServerInt]
    at com.sun.jndi.rmi.registry.RegistryContext.lookup(Unknown Source)
    at com.sun.jndi.toolkit.url.GenericURLContext.lookup(Unknown Source)
    at javax.naming.InitialContext.lookup(Unknown Source)
    at RequstReplication.main(RequstReplication.java:27)
    Caused by: java.rmi.UnmarshalException: error unmarshalling return; nested excep
    tion is:
    java.lang.ClassNotFoundException: ServerModule.ServerInt
    at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
    ... 4 more
    Caused by: java.lang.ClassNotFoundException: ServerModule.ServerInt
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at sun.rmi.server.LoaderHandler.loadProxyInterfaces(Unknown Source)
    at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
    at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
    at java.rmi.server.RMIClassLoader$2.loadProxyClass(Unknown Source)
    at java.rmi.server.RMIClassLoader.loadProxyClass(Unknown Source)
    at sun.rmi.server.MarshalInputStream.resolveProxyClass(Unknown Source)
    at java.io.ObjectInputStream.readProxyDesc(Unknown Source)
    at java.io.ObjectInputStream.readClassDesc(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    ... 5 more
    I can access naming enumeration of registry and object bound to it.
    by following program.I shows corect objects.
    Context namingContext=new InitialContext();
    NamingEnumeration<NameClassPair> e=namingContext.list("rmi:");
    while(e.hasMore())
    System.out.println(e.next().getName());
    While when i start RMI server from simple java program i can access these objects from registry.
    I am not getting what is problem problem.Is there any other way to send request?
    Plese give quick response.

  • Help me to run this simple RMI example

    When i m running this example in standalone pc it works but while running on to different pc it gives error though I m giving the IP address from client of server.. If anyone can help me out plz help.
    Code:
    ReceiveMessageInterface
    import java.rmi.*;
    public interface ReceiveMessageInterface extends Remote
    void receiveMessage(String x) throws RemoteException;
    Server code:
    import java.rmi.*;
    import java.rmi.registry.*;
    import java.rmi.server.*;
    import java.net.*;
    public class RmiServer extends java.rmi.server.UnicastRemoteObject
    implements ReceiveMessageInterface
    int thisPort;
    String thisAddress;
    Registry registry; // rmi registry for lookup the remote objects.
    // This method is called from the remote client by the RMI.
    // This is the implementation of the �ReceiveMessageInterface�.
    public void receiveMessage(String x) throws RemoteException
    System.out.println(x);
    public RmiServer() throws RemoteException
    try{
    // get the address of this host.
    thisAddress= (InetAddress.getLocalHost()).toString();
    catch(Exception e){
    throw new RemoteException("can't get inet address.");
    thisPort=3232; // this port(registry�s port)
    System.out.println("this address="+thisAddress+",port="+thisPort);
    try{
    // create the registry and bind the name and object.
    registry = LocateRegistry.createRegistry( thisPort );
    registry.rebind("rmiServer", this);
    catch(RemoteException e){
    throw e;
    static public void main(String args[])
    try{
    RmiServer s=new RmiServer();
    catch (Exception e) {
    e.printStackTrace();
    System.exit(1);
    Client code:
    import java.rmi.*;
    import java.rmi.registry.*;
    import java.net.*;
    public class RmiClient
    static public void main(String args[])
    ReceiveMessageInterface rmiServer;
    Registry registry;
    String serverAddress=args[0];
    String serverPort=args[1];
    String text=args[2];
    System.out.println("sending "+text+" to "+serverAddress+":"+serverPort);
    try{
    // get the �registry�
    registry=LocateRegistry.getRegistry(
    serverAddress,
    (new Integer(serverPort)).intValue()
    // look up the remote object
    rmiServer=
    (ReceiveMessageInterface)(registry.lookup("rmiServer"));
    // call the remote method
    rmiServer.receiveMessage(text);
    catch(RemoteException e){
    e.printStackTrace();
    catch(NotBoundException e){
    e.printStackTrace();
    }

    When we compile with rmic skeleton and stub get created then we hav to place stub at each client ???Your remote client applcation need only _Stub.class fiels.
    Is there way by which we can know how many clients are connected to the
    server and there IP address, can anyone give the code... I guess that you should use a RMI login/logout method to register/unregister your client connection information into a databse or a simple static Hashtable(Vector) object.

  • Difference Between JMS and RMI

    Difference Between JMS and RMI in J2EE Technologies

    STFW
    JMS - http://www.google.co.za/search?hl=en&q=what+is+jms&meta=
    RMI - http://www.google.co.za/search?hl=en&q=what+is+rmi&meta=

  • Problem with socket factory in RMI over SSL in proxy setup

    Hi
    The following is the setup I have;
    1. I have an application in which the server is running in https mode and I have exported my remote objects using ServerSocketFactory and ClientSocketFactory which will create SSLServerSocket and SSLSocket respectively.
    2. When I run my connect a client to this server and invoke some method on any of the remote objects, I get the following exception:
    java.lang.NullPointerException
    at sun.rmi.transport.tcp.TCPConnection.getOutputStream(Unknown Source)
    at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
    at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
    at sun.rmi.server.UnicastRef.invoke(Unknown Source)
    at com.acme.ems.server.app.main.TestSumImpl_Stub.addOne(Unknown Source)
    at com.acme.ems.client.app.tools.EMSHaSftpSettings.okButtonActionPerformed(EMSHaSftpSettings.java:216)
    at com.acme.ems.client.app.tools.EMSHaSftpSettings.access$000(EMSHaSftpSettings.java:28)
    at com.acme.ems.client.app.tools.EMSHaSftpSettings$1.actionPerformed(EMSHaSftpSettings.java:183)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.Dialog$1.run(Unknown Source)
    at java.awt.Dialog$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.awt.Dialog.show(Unknown Source)
    at com.acme.ems.client.utility.BasicDialog.showContainerInsideDialog(BasicDialog.java:103)
    at com.acme.ems.client.app.tools.EMSHaSftpSettings.init(EMSHaSftpSettings.java:322)
    at com.adventnet.nms.util.ConsumeKnownEvents.showTheFrame(ConsumeKnownEvents.java:197)
    at com.adventnet.nms.util.ConsumeKnownEvents.actionPerformed(ConsumeKnownEvents.java:103)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.AbstractButton.doClick(Unknown Source)
    at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
    at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
    My understanding is, when invoking remote object's method from the client, a the clientSocketFactory implementation will be called and an SSLSocket will be created for communication between remote server and client. In this case,my guess is somehow the createSocket() method of the clientSocketFactory is returning Null.The question is why?????Any help soon is appreciated.
    Note that , we are doing this in a proxy set-up.

    I've made a similer post.
    I was able to get it working by doing the following
    Make sure to add and equals to your RMISocketFactory's
    something at least this
    public boolean equals(Object obj)
    return obj != null && obj.getClass() == this.getClass();
    I had to enable the follong cypher suite SSL_DH_anon_WITH_RC4_128_MD5
    but this leads to a possible man in the middle attack.
    I posted to try and get that resolved. (see ssl lockup on handshake)

  • Problem with RMI in ADB T75 receiver

    Hi:
    I have a problem with an xlet that uses the RMI (IXC) API in the ADB T75 development settop box.
    I export an object (of type MyObject) implementing the Remote interface, and, later, I import it with no problem.
    The problem appears after importing the object, when I try to cast the imported object to the type of the exported object (type MyObject) for using it (example on page 371 of the marvelous Morris book).
    If I import the object in the same xlet where I export it (a little bit useless), the process works fine as the class of the imported object (remoteObject.getClass().getName()) is the same of the exported object.
    But, when importing the object from another xlet, doing the cast fails (ClassCastException). This time, remoteObject.getClass().getName() returns the name "stub_MyObject_ca_ba" ( "ca" is the OrgID and "ba" is the AppID of the exporting xlet). That is, the middleware is returning to the importing xlet an object of the stub class.
    The ClassCastException seems to be right, as the the superclass of the "stub_MyObject_ca_ba" is directly java.lang.Object. That is, the types of the exported object (MyObject) and the returned object (stub_MyObject_ca_ba) are not in the same hierarchy.
    Has anyone one explanation or solution?
    May be a bug of the ADB T75 settop box?
    Thanks in advance for your comments
    Liga0068

    Problem solved. This was posted by Pretorius_594 on Feb 27, 2004.
    Sorry for bothering.
    The problem was due to that I was doing a cast to the original object (MyObject). That is:
    remoteObject = lookup(...)
    MyObject importedobject = (MyObject)remoteObject.
    I saw such an example in the Morris and Smith-Chaigneau book, but, definetively, that code seems not to work (at least in the ADB receiver)
    Th right solution is to extend the Remote interface (MyRemote) and to cast the importedobject to that type. That is:
    public interface MyRemote extends Remote ...
    remoteObject = lookup(...)
    MyRemote importedobject = (MyRemote)remoteObject.
    Liga0068

  • Please help: RMI and Swing/AWT issue

    Hi guys, I've been having a lot of trouble trying to get a GUI application to work with RMI. I'd appreciate any help. Here's the story:
    I wrote a Java application and its GUI using Netbeans. In a nutshell, the application is about performing searches. I am now at the point where I need exterior programs to use my application's search capabilities, thus needing RMI. Such exterior programs are to call methods currently implemented in my application.
    I implemented RMI, and got the client --> server communication working. However, the GUI just breaks. It starts outputting exceptions, gets delayed, doesn't update properly, some parts of it stop working.... basically hysterical behavior.
    Now take a look at this line within my server class:
    Naming.rebind("SearchProgram", mySearchProgram);
    If I take it out, RMI obviously does not work... but the application and its GUI work flawlessly. If I put it in, the RMI calls work, but the GUI's above symptoms occur again. Among the symptoms are null pointer exceptions which all look similar, are related to "AWT-EventQueue-0", and keep ocurring. Here's just snippet of the errors outputted:
    Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at javax.swing.plaf.metal.MetalScrollBarUI.getPreferredSize(MetalScrollBarUI.java:102)
    at javax.swing.JComponent.getPreferredSize(JComponent.java:1615)
    at javax.swing.JScrollBar.getMinimumSize(JScrollBar.java:704)
    at javax.swing.ScrollPaneLayout.minimumLayoutSize(ScrollPaneLayout.java:624)
    at java.awt.Container.minimumSize(Container.java:1598)
    at java.awt.Container.getMinimumSize(Container.java:1583)
    at javax.swing.JComponent.getMinimumSize(JComponent.java:1697)
    at java.awt.BorderLayout.minimumLayoutSize(BorderLayout.java:634)
    at java.awt.Container.minimumSize(Container.java:1598)
    at java.awt.Container.getMinimumSize(Container.java:1583)
    at javax.swing.JComponent.getMinimumSize(JComponent.java:1697)
    at java.awt.BorderLayout.minimumLayoutSize(BorderLayout.java:634)
    at java.awt.Container.minimumSize(Container.java:1598)
    at java.awt.Container.getMinimumSize(Container.java:1583)
    at javax.swing.JComponent.getMinimumSize(JComponent.java:1697)
    at javax.swing.BoxLayout.checkRequests(BoxLayout.java:433)
    at javax.swing.BoxLayout.layoutContainer(BoxLayout.java:375)
    at java.awt.Container.layout(Container.java:1401)
    at java.awt.Container.doLayout(Container.java:1390)
    at java.awt.Container.validateTree(Container.java:1473)
    at java.awt.Container.validateTree(Container.java:1480)
    at java.awt.Container.validateTree(Container.java:1480)
    at java.awt.Container.validateTree(Container.java:1480)
    at java.awt.Container.validateTree(Container.java:1480)
    at java.awt.Container.validate(Container.java:1448)
    at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:379)
    at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:113)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
    at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
    Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at javax.swing.plaf.basic.BasicMenuItemUI.getPreferredMenuItemSize(BasicMenuItemUI.java:400)
    at javax.swing.plaf.basic.BasicMenuItemUI.getPreferredSize(BasicMenuItemUI.java:310)
    at javax.swing.JComponent.getPreferredSize(JComponent.java:1615)
    at javax.swing.BoxLayout.checkRequests(BoxLayout.java:434)
    at javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:251)
    at javax.swing.plaf.basic.DefaultMenuLayout.preferredLayoutSize(DefaultMenuLayout.java:38)
    at java.awt.Container.preferredSize(Container.java:1558)
    at java.awt.Container.getPreferredSize(Container.java:1543)
    at javax.swing.JComponent.getPreferredSize(JComponent.java:1617)
    at javax.swing.JRootPane$RootLayout.layoutContainer(JRootPane.java:910)
    at java.awt.Container.layout(Container.java:1401)
    at java.awt.Container.doLayout(Container.java:1390)
    at java.awt.Container.validateTree(Container.java:1473)
    at java.awt.Container.validate(Container.java:1448)
    at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:379)
    at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:113)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
    at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
    There are no complaints about anything within my code, it's all GUI related whenever I make a bind() or rebind() call.
    Again, any help here would be great... cause this one's just beating me.
    Thanks!

    Maybe you want to change that worker thread to
    not do RMI but anything else (dummy data) to see if it really is RMI, I doubt it, I think you are updating some structures that have to do with swing GUI and hence you will hang.
    Just check this out.

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