Synopsis: java.lang.IllegalArgumentException: Signal already used by VM: SIGHUP

Description: If I run an application as a cron job using java version 1.3.1_06, the application runs fine.

If I then run the application as a cron job using java version 1.3.1_09, the application fails with the same error as below i.e.
java.lang.IllegalArgumentException: Signal already used by VM: SIGHUP

So it seems to be jre 1.3.1_09 that is causing the problem.

To reproduce the error:

I took the java code and recompiled it without any Ranos specifics..(i.e. removed mibaccesss part)
recompiled it and tried, I get the same problem when running under nohup:
{root} #: nohup java -classpath . MoScriptSignalHandler
Sending output to nohup.out
{root} #: cat nohup.out
Exception in thread "main" java.lang.IllegalArgumentException: Signal already used by VM: SIGHUP
        at sun.misc.Signal.handle(Signal.java:147)
        at MoScriptSignalHandler.main(MoScriptSignalHandler.java:38)



----------------------------------------------------------------

Original file MoScriptSignalHandler.java below:

/*------------------------------------------------------------------------
 *
 *
 * COPYRIGHT (C) ERICSSON RADIO SYSTEMS AB, 2000
 *
 * The copyright to the document(s) herein is the property of
 * Ericsson Radio Systems AB, Sweden.
 *
 * The document(s) may be used and/or copied only with the written
 * permission from Ericsson Radio Systems AB or in accordance with
 * the terms all conditions stipulated in the agreement/contract
 * under which the document(s) have been supplied.
 *
 *------------------------------------------------------------------------
 */

/*
 *
 * File name: MoScriptSignalHandler
 *
 * Author: Buhr
 *
 */

/*--------------------------------------------------------------------------*/
/* <CLEARCASE HISTORY> */
/* */


package com.ericsson.nms.umts.ranos.cms.moscript;

// SUN
import sun.misc.Signal;
import sun.misc.SignalHandler;

/**
 * This class handles Unix signals. The class rolls back active transactions
 * before the JVM is terminated (if the user kills the process).
 * This is in order to avoid to leave locked MOs.
 */
class MoScriptSignalHandler
{
    //This signal means that another process is trying to abort your process.
    private static final String SIG_ABRT = "ABRT";
    // This signal indicates that a Ctrl+Break key sequence was pressed under Windows.
    private static final String SIG_BREAK = "BREAK";
    //This signal means that another process is trying to terminate your process.
    private static final String SIG_TERM = "TERM";
    private static final String SIG_QUIT = "QUIT";
    // This signal indicates that a segment violation has taken place.
    private static final String SIG_SEGV = "SEGV";
    //This signal catches floating point exceptions.
    private static final String SIG_FPE = "FPE";
    //This signal indicates that an illegal instruction has been attempted.
    private static final String SIG_ILL = "ILL";
    //This signal indicates that a Ctrl+C key sequence was pressed under Windows
    private static final String SIG_INT = "INT";
    private static final String SIG_HUP = "HUP";

    // Reference to the MibAccess class to terminate
    private static MibAccess mibAccess = null;

private static SelfMgtMibAccess selfMgtmibAccess = null;

    private MoScriptSignalHandler() {
    }

    private static class MySignalHandler implements SignalHandler
    {
public void handle(Signal aSignal)
{
System.out.println( "Caught " + aSignal.toString() + " signal.");
mibAccess.rollbackTransaction();
}
    }

    public static void initiate(MibAccess theMibAccess)
    {
mibAccess = theMibAccess;

SignalHandler sigHdl = new MySignalHandler();

Signal.handle(new Signal(SIG_HUP), sigHdl);
Signal.handle(new Signal(SIG_INT), sigHdl);

    }

public static void initiate(SelfMgtMibAccess theMibAccess)
{
selfMgtmibAccess = theMibAccess;

SignalHandler sigHdl = new MySignalHandler();

Signal.handle(new Signal(SIG_HUP), sigHdl);
Signal.handle(new Signal(SIG_INT), sigHdl);

    }
}

---------------------------------------------------

Test file MoScriptSignalHandler.java below:

import sun.misc.Signal;
import sun.misc.SignalHandler;

class MoScriptSignalHandler
{
    //This signal means that another process is trying to abort your process.
    private static final String SIG_ABRT = "ABRT";
    // This signal indicates that a Ctrl+Break key sequence was pressed under Windows.
    private static final String SIG_BREAK = "BREAK";
    //This signal means that another process is trying to terminate your process.
    private static final String SIG_TERM = "TERM";
    private static final String SIG_QUIT = "QUIT";
    // This signal indicates that a segment violation has taken place.
    private static final String SIG_SEGV = "SEGV";
    //This signal catches floating point exceptions.
    private static final String SIG_FPE = "FPE";
    //This signal indicates that an illegal instruction has been attempted.
    private static final String SIG_ILL = "ILL";
    //This signal indicates that a Ctrl+C key sequence was pressed under Windows
    private static final String SIG_INT = "INT";
    private static final String SIG_HUP = "HUP";

    private MoScriptSignalHandler() {
    }

    private static class MySignalHandler implements SignalHandler
    {
public void handle(Signal aSignal)
{
System.out.println( "Caught " + aSignal.toString() + " signal.");
}
    }

public static void main(String[] args)
{

SignalHandler sigHdl = new MySignalHandler();
Signal.handle(new Signal(SIG_HUP), sigHdl);
Signal.handle(new Signal(SIG_INT), sigHdl);
System.out.println( "hello");

    }

}
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