Re: [cinjug-users] Java process hangs

["Jason Kretzer/STAR BASE Consulting Inc." <JKretzer@xxxxxxxxxxxxxxx>]

So which are you using to make it fire
every 5 minutes? The timer or the cron?

I do not mean to insult your intelligence
but even the best of us make this type of mistake so I must ask this.  Did
you remember to use System.exit() when if finishes?

I know I have done this more than once.
Sorry if it is too simplistic.

-Jason

Creighton Kirkendall <ckirkendall@xxxxxxxxxxxxxx>

04/14/2004 09:01 AM

To	users@xxxxxxxxxx
cc
Subject	[cinjug-users] Java process hangs

I have a problem.  I have a simple java process
that runs as a cron
every 5 minutes.  About once every 2 hours give or take the process
hangs and appears to be in deadlock.  I cannot figure out why.  I
have
tried to access a stack dump by doing a "kill -3 <pid>"
but all I get to
stderr is:

JVMDG217: Dump Handler is Processing a Signal - Please Wait.

But no dump ever appears.  The process is simple but it does use the
java.util.Timer.  Why can't I get a stack trace?  I have looked
at the
state   using "ps aux" and it suggests it is still fine.
 Since I can
not get a stack trace from the JVM.  I tried an strace -p <pid>
and it
looks like it is waiting.

Here is the dump from strace.
 futex(0xb4226780, FUTEX_WAIT, 126, NULL

Here is the stats on the machine.
IBMJDK 1.4.1-02
LINUX RHAT ENTERPRISE

Any help would be very appreciated. 

Creighton Kirkendall 



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