From: Guillermo.Acilu@...
Date: 2008-07-15T21:35:30+09:00
Subject: Handling exceptions in Threads

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Hello guys,

I have made an multithreaded algorithm that triggers around a hundred=20
concurrent threads. I have in fact, two versions of the same algorithm,=20
one with threads and another with recursive calls.

Each thread execute a query on an Oracle database and according to the=20
data, it either calls a new thread and ends, or it stores the result in a=20
global array. The recursive version follow the same process, but instead=20
or running in parallel, it calls the method over and over sequentially.

The recursive version runs perfectly and it ends without problem. The=20
multithreaded version fails with an exception that I am not able to=20
identify.

If I leave the Thread.abort=5Fon=5Fexception =3D false, the algorithm ends =
after=20
triggering about 10 threads. If I set it to Thread.abort=5Fon=5Fexception =
=3D=20
true, the algorithm end abnormally, but without printing any error=20
message.

I have added the following code at the end of the method called by the=20
thread:

rescue Exception =3D> error
    puts "#{error.class}: #{error.message}"

But I cannot get any error message in the console. I am sure that the=20
problem is something related with the database, but I do not know how to=20
solve the problem if I do not see the error message.

Any ideas?

---
Guillermo Acilu
Senior Engineer, Koiaka GmbH

Koiaka GmbH
Riesserkopfstr. 17=20
82467 Garmisch-Partenkirchen
Tel: +49 (0)8821 9679555=20
Fax: +49 (0)8821 730 9185=20
Mailto:guillermo.acilu@koiaka.com
http://www.koiaka.com

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