ObjectInputStream JXTA problem

Question

I'm trying to read an object from an ObjectInputStream (created from a JxtaSocket) like this:
Object obj = ois.readObject();
If the object is a String Object everything works just fine!
If the object for example is an ImageIcon, Integer or a custom object that is serializable I get a:
java.io.StreamCorruptedException
     at java.io.ObjectInputStream.readObject()
what is wrong ?

Answer 1

and this is the client related stuff ,
the problem accures in the out.writeObject(t) ,
i have an SocketException , and it says :
"socket write error ".
what can it be ?
public void init(){
     t=new Merkava();//temp , for checking
     System.out.println("Client: initializing");
     try{
       addr=InetAddress.getByName("localhost");
    }catch(IOException e){System.out.println("Client: unable to recieve address");}
     try{
         s=new Socket(addr,Server.PORT);
    }catch(IOException e){System.out.println("Client: unable to create socket");}
     try{
         out=new ObjectOutputStream((s.getOutputStream()));
    }catch(IOException e){System.out.println("Client: unable to create outputstream");}
     try{
      recv=new RecieveData(s);
    }catch(IOException e){System.out.println("Client: unable to create inputstream");}
   System.out.println("Client: initializing finished");
   public void start(){
     try{
       out.writeObject(t); //registers the tank in the server
     //  System.out.println("Client: registerd tank");
//THE PROBLEM ACCURES HERE!!!!!!    
}catch(IOException e){
           System.out.println("Client: unable to send data");}
         if(runner==null){
         runner=new Thread(this);
         runner.start();
   }