Re: [Wrapper-user] Error in WrapperListener.start callback.

[Andreas W. <And...@ag...>]

Hi tweety123,

first of all, the second argument of the start method is meant to pass =
the command line arguments from the main method. If you do not need =
them, the
array may be null or empty.

Your problem arises from the fact that you use an object that has not =
been initialized in the following line (38 as mentioned in the stack =
trace):=20

socket_pgm.createSocket();

I do not see any code that creates the object (e.g. socket_pgm  =3D new =
SocketPgm()).

-Andreas

-----Original Message-----
From: wra...@li... =
[mailto:wra...@li...] On Behalf Of =
tweety123
Sent: Dienstag, 8. August 2006 11:17
To: wra...@li...
Subject: [Wrapper-user] Error in WrapperListener.start callback.


    Hi,

    I don't understand what the second argument means in =
"WrapperManager.start(WrapperListener listener, java.lang.String[] =
args)".


    Also, I wrote a sample code. Am getting the following error when =
trying to execute it:

    "Wrapper (Version 3.2.1) http://wrapper.tanukisoftware.org

    Error in WrapperListener.start callback.=20
java.lang.NullPointerExceptionjava.lang.NullPointerException

        at Test.JSWrapper.start(JSWrapper.java:38)
        at
org.tanukisoftware.wrapper.WrapperManager.startInner(WrapperManager.java:=
3125)
        at
org.tanukisoftware.wrapper.WrapperManager.privilegedStart(WrapperManager.=
java
:2109)
        at
org.tanukisoftware.wrapper.WrapperManager.access$2400(WrapperManager.java=
:416)
        at
org.tanukisoftware.wrapper.WrapperManager$5.run(WrapperManager.java:2044)=

        at java.security.AccessController.doPrivileged (Native Method)
        at
org.tanukisoftware.wrapper.WrapperManager.start(WrapperManager.java:2041)=

        at Test.JSWrapper.main(JSWrapper.java:73)"


    Can someone please throw light on this?



    This is the implementation of WrapperListener that I have:

    package Test;

    import org.tanukisoftware.wrapper.WrapperListener;
    import org.tanukisoftware.wrapper.WrapperManager;

    public class JSWrapper implements WrapperListener {

        SocketPgm socket_pgm;
        private boolean status =3D false;=20
      =20
        public JSWrapper()
        {
          =20
        }
      =20
        public void displayHi()
        {
            System.out.println("Hi");
        }
      =20
        public Integer start(String args[])
        {
            status =3D true;
            System.out.println("Status =3D "+status);
            socket_pgm.createSocket();
            return null;
          =20
        }
      =20
      =20
        public int stop(int exitCode)
        {
            status =3D false;
            System.out.println("Status =3D "+status);
            return exitCode;
        }
      =20
      =20
        public void controlEvent(int event)
        {
            if (WrapperManager.isControlledByNativeWrapper()) {
                // The Wrapper will take care of this event
            } else {
                // We are not being controlled by the Wrapper, so
                //  handle the event ourselves.
                if ((event =3D=3D WrapperManager.WRAPPER_CTRL_C_EVENT) =
||
                    (event =3D=3D =
WrapperManager.WRAPPER_CTRL_CLOSE_EVENT) ||
                    (event =3D=3D =
WrapperManager.WRAPPER_CTRL_SHUTDOWN_EVENT )){
                    WrapperManager.stop(0);
                }
            }
        }
      =20
      =20
        public static void main(String[] args)
        {
            String[] arg =3D new String[2];
            arg[0] =3D "Hi";
            arg[1] =3D "hello";
            WrapperManager.start(new JSWrapper(), arg);
        }
    }




    where SocketPgm is a program that creates a server socket & waits on =
a port for connections.


    Please throw some light on how to resolve this error.


    Thanks.


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