NullPointerException in Socket

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,

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