Retrieving JAR filename

Hello,
I would like to retrieve the name of the JAR file containing the package I use currently. That is from a given instance of it I would like to know from which package it was from.
If I hard-code this info, eg 'my_packages.jar' then it works only if I run my project from the same directory:
java -jar my_packages.jar
but it cannot find it anymore if I try from another directory:
java -jar ./lib/my_packages.jar
And I absolutely don't like hard-coding filenames...
Thanks
Xavier

I found the answer myself with another post:
http://forum.java.sun.com/thread.jsp?forum=22&thread=454253

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type in shell:
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//write your code here
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RuntimeException in Message-Mapping transformation: Exception:[java.lang.NullPointerException] in class com.sap.xi.tf._TESTMsgMapping_ method FilenameY$[com.sap.aii.mappingtool.tf3.rt.Context@32a38dfd]
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com/sap/xi/tf/_TESTMsgMapping_ a
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transformatio~
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