Re: NullPointerException in Socket

The scope of your listenSocket below is the enclosing try/catch block.

You are assigning a ServerSocket to one local object and attempting to 
use the accept() method in another object.

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{
>  
>
// BEGIN_SCOPE

>     ServerSocket listenSocket= new ServerSocket(SERVER_PORT);
>  
>
//^^^^^^_^^^^^^^^^^_ local ServerSocket created here

>     System.out.println("Socket is cool!");
>  
>
// END_SCOPE

>        }
>        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.
>
>В сообщении от Понедельник 03 Май 2004 21:29 вы написали:
>  
>
>>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,
>>>      
>>>
>
>  
>


-- 
Thomas Chenot

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