RE: [Wrapper-user] NT Service Issues

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- Use Wrapper to convert each child process into a service.
- Change your ServiceManager to use "net start" to start child services
- Change your ServiceManager to use "net stop" to stop child services
- Use Wrapper's service monitor to restart child services
Or
- Use Windows Service Recovery to restart child services

By wrapping the child processes as services, they won't be shutdown by a
logoff. The "net start" command will not start a service that is already
running. The "net stop" command will not stop a service that is already
stopped.

Also, the "sc" utility from the Windows Resource Kit has a few more
features than the "net" commands. For example, you can use the machine
parameter and distribute the services across multiple machines.

-----Original Message-----
From: Bashiro [mailto:ba...@en...]=20
Sent: Friday, February 25, 2005 3:52 AM
To: wra...@li...
Subject: Re: [Wrapper-user] NT Service Issues

Hi Adam,

I am not sure what Leif's suggestion will be. But to my understanding
it is easy using the intergration method 1 as you are using.

But in your case, if I understand correctly. Using intergration method 3
will help you out of the problem. That is; you will have controll over
the
wrapper and do some codings yourself. Hence you will be in charge how
you
want the wrapper to play (in some way).

bashiro

> Hi all,
>
> We are trialling using the Java Service Wrapper for our product and so
far
> are very impressed. We do however have two major issues that appear to
> manifest themselves mostly under Windows 2003 Server.
>
> To explain our issues, I'll first give some background on what our
> application does. Our application consists of 5 java processes, plus
one
> we call the ServiceManager. The ServiceManager upon startup starts
each of
> the other 5 processes by calling Runtime.getRuntime().exec(). It then
> continually checks that they are alive, and if not restarts them. It
also
> has a Runtime.getRuntime().addShutdownHook() to ensure that its child
> processes are shutdown when it is shutdown.
>
> We are using the Java Service Wrapper (3.1.1) to wrap our
ServiceManager
> by simply specifying our classname in the conf file. Our problems are
as
> follows:
>
> 1. When certain users log off from the server (via Remote Desktop),
> although the logs specify that the logged off signal is ignored, the
child
> processes (ran via Runtime.getRuntime().exec() are killed).
>
> e.g.
> INFO   | wrapper  | 2005/02/14 15:22:14 | User logged out.  Ignored.
> INFO   | jvm 1    | 2005/02/14 15:22:14 | 15:22:14,421 INFO
> [ServiceRunner] Starting service scheduler
> INFO   | jvm 1    | 2005/02/14 15:22:15 | 15:22:14,968 INFO
> [ServiceRunner] Starting service authenticator
> INFO   | jvm 1    | 2005/02/14 15:22:15 | 15:22:14,984 INFO
> [ServiceRunner] Starting service freetext
> INFO   | jvm 1    | 2005/02/14 15:22:15 | 15:22:15,015 INFO
> [ServiceRunner] Starting service conversion
>
> The ServiceRunner INFO messages are from our ServiceManager which is
still
> running, but detecting the other service have shutdown so is
restarting
> them.
>
> This is a problem as we are a web app, and users logged into our
system
> will be kicked out as their sessions are tied to these running apps.
>
> Is there any way of preventing "child" processes of the wrapped
service
> from also being killed?
>
>
> 2. Every now and then, presumably when the server is under load, the
JVM
> is terminated. This presents two problems, firstly that it is
happening,
> and secondly that it doesn't call our shutdown hook, so the child
> processes aren't killed, but then when it is restarted by the service
> wrapper, the child processes are all started for a second time,
leading to
> catastropic consequences to our application!
>
> INFO   | jvm 1    | 2005/02/16 09:44:07 | 09:44:07,659 INFO
> [ServiceRunner] Starting service conversion
> ERROR  | wrapper  | 2005/02/17 08:13:29 | JVM appears hung: Timed out
> waiting for signal from JVM.
> ERROR  | wrapper  | 2005/02/17 08:13:29 | JVM did not exit on request,
> terminated
> STATUS | wrapper  | 2005/02/17 08:13:34 | Launching a JVM...
> INFO   | jvm 2    | 2005/02/17 08:13:35 | Wrapper (Version 3.1.1)
> http://wrapper.tanukisoftware.org
> INFO   | jvm 2    | 2005/02/17 08:13:35 |
> INFO   | jvm 2    | 2005/02/17 08:13:35 | 08:13:35,375 INFO
[RpcHandler]
> RPC: invoking start
> INFO   | jvm 2    | 2005/02/17 08:13:35 | 08:13:35,375 INFO
> [ServiceHandler] Reading configuration file
> INFO   | jvm 2    | 2005/02/17 08:13:35 | 08:13:35,406 INFO
> [ServiceRunner] Starting service resourcecentre
> INFO   | jvm 2    | 2005/02/17 08:13:37 | 08:13:37,250 INFO
> [ServiceRunner] Starting service resourcecentre
> INFO   | jvm 2    | 2005/02/17 08:13:39 | 08:13:39,000 INFO
> [ServiceRunner] Starting service resourcecentre
> INFO   | jvm 2    | 2005/02/17 08:13:40 | 08:13:40,406 INFO
> [ServiceRunner] Starting service freetext
> INFO   | jvm 2    | 2005/02/17 08:13:40 | 08:13:40,734 INFO
> [ServiceRunner] Starting service resourcecentre
> INFO   | jvm 2    | 2005/02/17 08:13:42 | 08:13:42,578 INFO
> [ServiceRunner] Starting service resourcecentre
>
> Is there any way to prevent the JVM appearing as hung when it isn't
> really?
>
>
>
>
> Look forward to hearing back from anyone!
>
> Cheers, Adam
>
> Adam Eijdenberg
> DYTECH SOLUTIONS Pty. Ltd.
> -----------------------------------
>
> Level 2, 25 Argyle Street
> GPO Box 642
> Hobart TAS 7000
> Ph:   +61 3 6235 2222
> Fax:  +61 3 6235 2299
> ada...@dy...
> www.dytech.com.au
> -----------------------------------
>
>
>
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