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
 *     	 customer  Systems AB, Sweden.
 *
 *     	The document(s) may be used  and/or copied only with the written
 *     	permission from  customer  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");

    }

}
  xxxxx@xxxxx   10/15/04 18:47 GMT

N/A

See comments.

2004-08-12_17_28 GMT:

Test works properly with change as suggested by Karen:
--- before fix:
 283 % nohup ./j2sdk1_3_1_13/bin/java -classpath . MoScriptSignalHandler
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)
After fix ----- :
 287 % ./j2sdk1_3_1_13/bin/java -version
java version "1.3.1_13"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_13-b02)
Java HotSpot(TM) Client VM (build 1.3.1_13-TESTFIX-5084917-Ericsson-2004.08.11-chrisphi, mixed mode)
 288 % nohup ./j2sdk1_3_1_13/bin/java -classpath . MoScriptSignalHandler
hello

(See suggested fix for actual diffs.)

The updated libjvm's are available: 

 /net/altair.east/eng/chrisphi/5084917/1_3_1_13+fix5084917_libjvms.tar.Z

or an updated jdk:

 /net/altair.east/eng/chrisphi/5084917/j2sdk1_3_1_13+fix5084917.tar.Z

  xxxxx@xxxxx   2004-08-12