exception error

[mj zammit]

when i come to doing the following code:

 try {
                ClientSocket.getOutputStream().flush();
                ClientSocket.close();
            } catch (Exception e) {
                System.out.println("Exception: " + e);
            }   

i get the following error:
Exception: java.lang.NullPointerException

what does this mean?

[Joe Ess]

Is this a continuation of your previous topic?
NullPointerException means you tried to invoke a method on an object reference that has not been initialized. If you print the exception stack trace (there's a method in Exception that does it) it will tell you what line the exception occurred on.

[mj zammit]

yes yes it does continue from the previous topic.
I found out why it was not outputting the results
now i am trying to fix it...
I shall try out what you have suggested...