Re: [Wrapper-user] Exception thrown when invoking Thread.currentThread().sleep(250) with message "The handle is invalid"

[Andreas W. <And...@ag...>]

Hi Sabina,

As I assume that the run() method is not intended to be run inside an =
own thread, it runs inside the main thread.
Therefore, calling a Thread.sleep() in the main thread is not a good =
idea as it may interfere with the JVM or the wrapper.
You should only call the sleep() method in the context of an own =
thread's run() method to ensure that the proper thread is sleeping.

You should also not use Thread.currentThread().sleep(250) as sleep() is =
a static method and prefixing it with currentThread() will have no =
effect (see
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html#sleep(long)=
).

If you would provide more info about what you are trying to achieve, I =
could be more of a help.

--Andreas

-----Original Message-----
From: wra...@li... =
[mailto:wra...@li...] On Behalf Of David =
Hayes
Sent: Wednesday, April 11, 2007 17:19
To: wra...@li...
Subject: Re: [Wrapper-user] Exception thrown when invoking =
Thread.currentThread().sleep(250) with message "The handle is invalid"

I just wanted to clarify something from you:

You have a run() method inside your service app, that you call directly=20
from the main() method. Are you intending this run() method to be=20
running in it's own thread, (whilst the starting thread, that executes=20
main() continues). If this is the case you should be calling=20
myService.start(); (and also be making the MyServiceApp extend Thread).

When the wrapper runs an application using method 1, it doesn't exactly=20
run the same way as it would without the wrapper. For a start, there are =

other threads running by the time the code reaches your main() method=20
than there is without the wrapper. I suspect that you calling the=20
Thread.currentThread.sleep(250) is causing a wrapper thread to sleep,=20
and thus to lose a handle to some native resource.

David Hayes

SA...@sy... wrote:
> Hi,
>
> I'm using the service wrapper as described in Method 1 - =
WrapperSimpleApp
> Integration (Win32).
> I used the templates provided in the /src/bin directory to create
> MyService.bat
> InstallMyService.bat
> UninstallMyService.bat
>
> However, when I run MyService from the Administrative tools>Services
> an exception is thrown when I invoke =
Thread.currentThread().sleep(250);
> with the message:  The handle is invalid.
> after which the service stops, following a normal shutdown routine.
>
> I'm running on Win XP SP2
> Java Service Wrapper 3.2.3
> JDK 1.5.0_11
>
> Bellow is a snippet from the log file:
>
> INFO   | jvm 1    | 2007/04/11 09:39:12 | WrapperSimpleApp: invoking =
main
> method
> INFO   | jvm 1    | 2007/04/11 09:39:12 | 09:39:12,960 ERROR
> MyServiceApp:80 - Interrupted. The handle is invalid
> INFO   | jvm 1    | 2007/04/11 09:39:12 | WrapperSimpleApp: main =
method
> completed
> INFO   | jvm 1    | 2007/04/11 09:39:12 | WrapperSimpleApp: =
start(args)
> end.  Main Completed=3Dtrue, exitCode=3Dnull
> INFO   | jvm 1    | 2007/04/11 09:39:12 | WrapperListener.start runner
> thread stopped.
> INFO   | jvm 1    | 2007/04/11 09:39:12 | returned from
> WrapperListener.start()
> INFO   | jvm 1    | 2007/04/11 09:39:12 | Send a packet STARTED :
> DEBUG  | wrapperp | 2007/04/11 09:39:12 | read a packet STARTED :
> DEBUG  | wrapper  | 2007/04/11 09:39:12 | JVM signalled that it was
> started.
> INFO   | jvm 1    | 2007/04/11 09:39:13 | Startup runner thread =
stopped.
> INFO   | jvm 1    | 2007/04/11 09:39:13 | Wrapper Manager: =
ShutdownHook
> started
> INFO   | jvm 1    | 2007/04/11 09:39:13 | WrapperManager.stop(0) =
called by
> thread: Wrapper-Shutdown-Hook
> INFO   | jvm 1    | 2007/04/11 09:39:13 | Send a packet STOP : 0
> DEBUG  | wrapperp | 2007/04/11 09:39:13 | read a packet STOP : 0
> DEBUG  | wrapper  | 2007/04/11 09:39:13 | JVM requested a shutdown. =
(0)
>
>
> and a snippet from my java class:
>
>
> public class MyServiceApp{
>       public static void main(String[] args) {
>             MyServiceApp myService =3D new MyServiceApp();
>             myService .run();
>       }
>
>       public void run(){
>             //create new threads here
>             ....
>             //sleep
>             try {
>                   Thread.currentThread().sleep(250);
>             } catch (Exception e) {
>                   log.error("Interrupted. " + e.getMessage());
>             }
>       }
> }
>
>
> Any ideas are welcomed.
>
>
> Regards,
> Sabina Albu
>
> =
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