Server Conntion State Problem

Question

We have a java game which runs with communication from a server and it depends upon regular connectivity with the server. Our problem is in connection discontinuation.
Firstly in between connection �Stream Corrupted Exception� arrives and connection with server breaks (it�s not lost actually but the ser is go in a state where is neither send any thing nor receive but the connection still not braked).
And Second one - some time without exception server just hangs up does not listen and neither replies for some clients but same time work properly for other
Here are some codes for data sending and receiving
at sending on server
public void sendMessage(CMessage cMessage)
     if(bIsClosed==false)
            try
              objOutputStream.writeObject(cMessage);
              objOutputStream.flush();
            }catch(Exception e)
                 bIsClosed=true;
                 System.out.println("Error Sending Message "+cMessage.get_title()+e.toString());
               server.removeConnection( socket );
}at recive on client
public void run()
     Object objMessageRecived;
     CMessage cMessageRecived;
     while(true)
          try
               objMessageRecived=objInputStream.readObject();
               cMessageRecived=(CMessage)objMessageRecived;
               m_cWindow.handle_message(cMessageRecived);
          }catch(StreamCorruptedException sce){
               System.out.println("Error in connection !!!!!! "+sce.toString());
               break;
          catch(IOException ex){
               System.out.println("Error in connection "+ex.toString());
               break;
          catch(ClassNotFoundException ce){System.out.println("Error in connection !!!!!! "+ce.toString());}
}

Answer 1

Couple of things:
1: When you say it doesn't forward what does happen? Did you verify that you are in fact reaching the forward statement? Do you get an error?
2: I am not sure I understand you logic.
You get a username and password from the client.
You go to the database with "SELECT USERNAME, USERPASSWORD from USERLIST" which brings back all of the user/password pairs in the database.
You then cycle through this list of user/password pairs in a while loop:
while(rs.next()){
String users = rs.getString("USERNAME"); <-- Why set this within the loop
String pass = rs.getString("USERPASSWORD"); <-- will set multiple times
if(!users.equals(username))){  <-- what if the user is not the first user in the database? Will fail more times than succeed.
Why not do
SELECT USERNAME, USERPASSWORD from USERLIST where USERNAME = user and USERPASSWORD = password
Then check the results to see if it returned a record.