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

[Raaga T <ra...@gm...>]

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.
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 = false;

    public JSWrapper()
    {

    }

    public void displayHi()
    {
        System.out.println("Hi");
    }

    public Integer start(String args[])
    {
        status = true;
        System.out.println("Status = "+status);
        socket_pgm.createSocket();
        return null;

    }


    public int stop(int exitCode)
    {
        status = false;
        System.out.println("Status = "+status);
        return exitCode;
    }


    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 == WrapperManager.WRAPPER_CTRL_C_EVENT) ||
                (event == WrapperManager.WRAPPER_CTRL_CLOSE_EVENT) ||
                (event == WrapperManager.WRAPPER_CTRL_SHUTDOWN_EVENT)){
                WrapperManager.stop(0);
            }
        }
    }


    public static void main(String[] args)
    {
        String[] arg = new String[2];
        arg[0] = "Hi";
        arg[1] = "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.