Does addShutdownHook() work on the AS/400?

["McCallion, Martin" <martin.mccallion@xxxxxxxxx>]

Our application uses the Runtime.addShutdownHook() method to trap end
requests.  On Windows this means that if you close the console window
the application has a chance to end gracefully; similarly on Unix if you
issue a kill command.

The corresponding event on OS/400 is ENDJOB, right?  So you'd expect the
shutdown hook code to be executed when an ENDJOB is executed against the
job that issues the java command.  But it doesn't happen.  In case there
was a timing problem I tried using *CNTRLD and DLYTIME(1200).  Twenty
minutes ought to be enough for any self-respecting JVM to finish.  But
the threads don't output the expected "I'm ending" messages; and most
significantly, the job is still reported as ending abnormally.

Is there a way to make this work?  We're submitting a batch job which
calls QSH with some parameters, including a script file which is
executed.  The shell script executes the java command.

As I type this I begin to suspect that we'll have to end the BCI or
prestart job that the QSH command communicates with, because that's
where the java command is running.

The java code with the shutdown hook looks like this:


        // Register a shutdown hook that will stop the server gracefully
if its process is
        // killed by the operating system.
        Runtime.getRuntime().addShutdownHook(new Thread()
            {
                public void run()
                {
                    theServer.closedown("by signal", null, false);
                }
            });

The object theServer is a singleton, and the closedown() method tells
all its threads to end.

Any ideas?  I should note that I can't find any iSeries-specific
comments on this on IBM's website or anywhere else, but AlphaWorks has
some two-year old comments saying it doesn't work on Linux.

TIA.

Cheers,

Martin.

--
Martin McCallion
Senior Technical Consultant
Work:  martin.mccallion@misys.com
Home: martin.mccallion@ukonline.co.uk
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