[Wrapper-user] JVM hang causes

[Paul C. <cas...@au...>]

Hi all,

The JVM for the main process of our application (-Xmx1600M) was restarted
by the Java Service Wrapper today after pinging with no response from the
JVM for 10 mintues (as configured).

I can't for the life of me work out why it was hung though - there were no
exceptions in either the JSW log file nor the application's log file.

Moreover, when the JSW tried to get a thread dump on exit, it failed.
Here's a snippet from the log file:
ERROR  | wrapper  | 2004/02/17 12:02:55 | JVM appears hung: Timed out
waiting for signal from JVM.
STATUS | wrapper  | 2004/02/17 12:02:55 | Dumping JVM state.
DEBUG  | wrapper  | 2004/02/17 12:02:55 | Sending BREAK event to process
group 336.
ERROR  | wrapper  | 2004/02/17 12:02:55 | Unable to send BREAK event to JVM
process.  Err(6 : The handle is invalid. (0x6))
ERROR  | wrapper  | 2004/02/17 12:02:58 | Java Virtual Machine did not exit
on request, terminated

Before this was just 10 minutes of pinging without response from the JVM.
I know that noone can tell me what happened, but does anyone have some
ideas on where to start looking (ie make the haystack smaller so that the
needle is more obvious!).

Regards,

Paul Casanova