Java app dies on logoff

[David Jenkins]

Dear Java experts,

I've written a small Java 1.3.1 application running on Windows2000 server,
that connects to an Oracle database (9i) and to MQSeries (5.3), and passes
information between them. I installed it as a Windows service, trying both
the generic 'srvany' service utility supplied by Microsoft, and then using a
custom 'C' application that launches the JVM and invokes the Java app's
'main' method. In both cases, my app runs fine as a service, but dies on
logoff, regardless of whether it is installed under the Windows 'System'
account, or a local machine account, or a network account. I also tried
invoking it as an MQSeries custom service--it launches as part of the MQ
environment, and runs fine until I log off. (MQ and Oracle continue to run
when logged off.)

Can anyone suggest a reason why my app won't run in a logged-off state?
This is driving me nuts, so any and all help will be very much appreciated.

David Jenkins
(e-mail address removed)

 

[Stian Bakken]

The vm will by default terminate when logoff is performed. You must register
a custom logoff handler with the process. Try the following in your JNI
service application:

SetConsoleCtrlHandler(logoffHandler, TRUE);
..
..
BOOL WINAPI logoffHandler(DWORD dwCtrlType)
{
switch(dwCtrlType)
{
case CTRL_C_EVENT:
return TRUE;
case CTRL_CLOSE_EVENT:
return TRUE;
case CTRL_SHUTDOWN_EVENT:
// You may want to do some things in your java app here
return TRUE;
case CTRL_LOGOFF_EVENT:
return TRUE;
}
return FALSE;
}


Best of luck!
Stian

 

[Manfred Rosenboom]

The vm will by default terminate when logoff is performed. You must register
a custom logoff handler with the process.

Much simpler you can start the JVM with the parameter -Xrs to ignore this
signal/event.

Best,
Manfred

 

[David Jenkins]

Thanks, Manfred & Stian. I should have mentioned that my custom 'C' routine
did include a logoff handler, virtually identical to the code Stian offered.
(I also have to confess, I got the 'C' program from a very nice person named
Bill Giel, who posted it on http://www.kcmultimedia.com/javaserv/.) I will
try adding the -Xrs parameter on startup & crossing my fingers.

I'm very grateful for your help! Half the office is scratching their heads
over this problem.