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

[tweety123 <the...@ya...>]

    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.


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