Re: NullPointerException in Socket

Yes, but that has a different scope.  You're not actually assigning 
anything to the field.

For example:

public class Example {
     private Integer i;

     public static void main(String[] args) {
         Example e = new Example();
         e.doSomething();  // This will print "6"
         System.out.println(i);  // This will print "null"
     }

     public void doSomething() {
         Integer i = new Integer(6);
         System.out.println(i);  // This will print "6"
     }
}

The solution is to change the creation line to:

	listenSocket = new ServerSocket(SERVER_PORT);

Hope that clarifies things.

	-Shawn

On 3-May-04, at 9:47 PM, Denis Yakovlev wrote:

> Hi,Shawn!!!
> Thank you very much for your answer.
> But I didn`t forget create ServerSocket at the begin of the programm.
> try{
>           ServerSocket listenSocket= new ServerSocket(SERVER_PORT);
>           System.out.println("Socket is cool!");
>         }
>         catch (IOException excp)
>         {
>         System.err.println("Unable to listen port" + SERVER_PORT + ":" 
> +excp);
>         }
> When I run this programm I see - "Socket is cool", but then at point 
> described
> above I have NullPointerException.
> Have you more ideas?
> Excuse me ,but I need any help.
>
> Thanks a lot.
>
>     03  2004 21:29  :
>> Hi, Dennis.  It looks like you've forgotten to create the ServerSocket
>> object:
>>
>> 	listenSocket = new ServerSocket(some_port);
>>
>> Regards,
>> 	-Shawn
>>
>> On 3-May-04, at 5:46 AM, Denis Yakovlev wrote:
>>> Hi, All!
>>> Can you help me with folowed problem? May be I just have poor
>>> knowledge in
>>> Java. So...
>>> The problem:
>>>  public ServerSocket listenSocket ;
>>>
>>> public void serveTini() {
>>>          Socket clientSocket;
>>>                 try{
>>>                         System.out.println("Point1");
>>>                         while(keepRunning){
>>>                                 System.out.println("DeadPoint");
>>>                                  clientSocket = 
>>> listenSocket.accept();
>>> <----
>>>
>>>  at this point I have an error:
>>>
>>> java.lang.NullPointerException
>>>    in SockTiniTerm.serveTini(@JPC=b0010)
>>>       in java.lang.System.???
>>>
>>> What should I do? Is syntax correct? Anybody please help me
>>>
>>>
>>>
>>> --
>>> Best regards
>>> Denis Yakovlev,
>
> -- 
> Best regards
> Denis Yakovlev,
> QA Engineer, SW-Soft
> Tel:89059564660
>

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