DaniWeb IT Discussion Community http://www.daniweb.com/forums/ Tech support, programming, web development, and internet marketing community. Forums to get free computer help and support. en-US Fri, 04 Dec 2009 19:17:38 GMT vBulletin 60 http://www.daniweb.com/alphaimages/misc/rss.jpg DaniWeb IT Discussion Community http://www.daniweb.com/forums/ java RMI: Exception, java.io.EOFException http://www.daniweb.com/forums/thread239188.html Tue, 17 Nov 2009 11:58:05 GMT Hi,

I'm writing my first RMI application, it's an auction system. At the end of the auction period for a particular item the server sends a 'callback' to the winning client telling him that he's won. It works fine till here, but after that i get this exception. It shows on the client console, but i suspect it's coming from the server. Any clues what's going on here? Please let me know if you need to see the client or server code.

I use java rmi client and server.
This is the exception below:

java.rmi.UnmarshalException: Error unmarshaling return header; nested exception is: <br /> java.io.EOFException<br /> at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:209)<br /> at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)<br /> at das.auction.client.ClientDriver_Stub.notify(Unknown Source)<br /> at das.auction.server.RemoteAuctionImpl.notifyWinnerInfo(RemoteAuctionImpl.java:220)<br /> at das.auction.server.RemoteAuctionImpl$BidTimeReached.run(RemoteAuctionImpl.java:75)<br /> at java.util.TimerThread.mainLoop(Timer.java:512)<br /> at java.util.TimerThread.run(Timer.java:462)<br /> Caused by: java.io.EOFException<br /> at java.io.DataInputStream.readByte(DataInputStream.java:250)<br /> at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:195)<br /> ... 6 more<br />

This is code where i call client callback method in server. the stack comes from the catch block of this method.
public void notifyWinnerInfo(String itemCodeId,String userId,Integer maxBidVal)

        {

                try

                {

                        System.out.println("update winner and notify clients");

                        Set<Map.Entry<Subscriber,UserInfo>> subsUserMapArray = subscriberList.entrySet();

                        Iterator it = subsUserMapArray.iterator();

                        Subscriber winner;

                        System.out.println("# of elements in iterator " + subsUserMapArray.size());

                        while(it.hasNext())

                        {

                                System.out.println("element found");

                                Map.Entry<Subscriber,UserInfo> m = (Map.Entry<Subscriber,UserInfo>)it.next();

                                UserInfo uid = m.getValue();

                                Subscriber s = m.getKey();

                                if(uid.getUID().equals(userId))

                                {

                                        s.notify(itemCodeId,maxBidVal,Boolean.TRUE);

                                }

                                else

                                {

                                        s.notify(itemCodeId,maxBidVal,Boolean.FALSE);

                                }

                        }                      

                }

                catch(Exception re)

                {

                        System.out.println("UpdateUserBid"); // This is where the stack comes from, i get this system.out

                        re.printStackTrace();

                }

        }

This is the client code for this callback

public void notify(String itemCodeId,Integer maxBidVal,Boolean winner)

        {

                System.out.print((char)27 + "[2J");

                System.out.println("server notification: " + " ItemCodeId: " + itemCodeId + " maxBidVal: " + maxBidVal + " winner?: " + winner);

                if(!winner)

                {

                        System.out.println("Sorry, you were not the highest bidder");

                }

                else

                        System.out.println("Congrats !! you have won the bid for this item, Please see our website for payment options");



                //sleep here for sometime then go to first screen again



                ClientStateMachine.nextItem = "WELCOME";

                ClientStateMachine.run();

        }

as soon as i do anything on the first screen now, i get the stack. ]]> Java Agni http://www.daniweb.com/forums/thread239188.html