Getting NullPointerException

[Ankur Jain Kothari]

can anyone explain why am getting such an error in this code

  private void handleConnection(final String url) {
        Thread echo = new Thread() {

            public void run() {
                StreamConnection stream = null;
                try {
                  System.out.println("a");
                    stream = (StreamConnection) Connector.open(url);// line 240 were i get the exception
System.out.println(stream);
                    log("Bluetooth stream open.");
                   
                    InputStream in = stream.openInputStream();
                    OutputStream out = stream.openOutputStream();
                    log("Start echo loop."); 
 int fr = 0;
                    while (true) {

                        byte[] b = new byte[50];
                        int f = in.read(b);
                        fr++;

                        String s2 = new String(b);
                        System.out.println(s2);
                        String s3=s2.substring(0, f);
                        if(!s3.equals("fire"))
                        {

                        if (fr > 1) {
                            int f1 = s2.indexOf(" ");
                        //System.out.println(s2.substring(0, f1) + " " + s2.substring(f1 + 1, f));
                        log(s3);
                            int x = Integer.parseInt(s2.substring(0, f1) + 9);
                            int y = Integer.parseInt(s2.substring(f1 + 1, f) + 9);



                            robot.mouseMove(x, y);




                        }
                        }
                        if(s3.equals("fire"))
                        {
                            System.out.println("vdsvd");
                            robot.mousePress(16);
                            robot.mouseRelease(16);
                        }



                    }
                } catch (IOException e) {
                    log(e);
                } finally {
                    log("Bluetooth stream closed.");
                    if (stream != null) {
                        try {
                            stream.close();
                        } catch (IOException e) {
                            log(e);
                        }
                    }
                }
            }
        };
        echo.start();
    } 

exception is

   Exception in thread "Thread-2" java.lang.NullPointerException

        at com.intel.bluetooth.MicroeditionConnector.openImpl(MicroeditionConnector.java:179)
        at com.intel.bluetooth.MicroeditionConnector.open(MicroeditionConnector.java:162)
        at javax.microedition.io.Connector.open(Connector.java:83)
        at PCClientCOMM$3.run(PCClientCOMM.java:240) 

[Roberto Perillo]

Howdy, Ted!

Champion, where exactly are you getting the exception? Is it in line 8 of the code above?

[Ankur Jain Kothari]

yes....

[Henry Wong]

What is the value of url that is passed into the method?

Henry

[Ankur Jain Kothari]

i did print the stream in the next line...it is giving a valid name everytime i run the program....

[David Newton]

You're not getting the exception there, the exception is happening where the stack trace says it is: inside that other library.