How to develop a Repository Service to trigger a workflow automatically??

Hi All,
 I have configured a approval workflow on the folder /documents/test in KM Content.
 I want to trigger this workflow automatically whenever a new document is created in this folder.
 How can i do it? Should i create a Repository Service? or is there any other way??
 I can't find a lot of info about creating Repository Service. I have seen other threads in this forum too.
 Can any1 plz help me in this regard?? Any code samples???
 Would appreciate any kind of help. It's kinda urgent.
Thanks in advance.
Regards,
Sai Krishna.

Hello Praveen,
thank you for answer and the link to the sap help.
sorry for my beginner questions, but in sap help in chapter "Setting up the J2EE Engine for Debugging" under number one "Start the Config tool and connect to the J2EE Engine database.".
Where will I find this config tool?
Regards,
Markus

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Hi Romano & Detlev ,
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This is what I was looking
Detlev:
About the NPE ... in the above code I am not getting that.
Thats my mistake
Earlier I tried with
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In the second line of code I was getting the NPE
after that I used to if condition to debug it
Sorry for the confusion...
One more thing
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