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modifying an existing jar file using ant

 
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hi,
can we modify an existing jar file with ant.
is there any ant task available for this.
modifications is like adding a class file to a jar.
 
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You can again create the jar file. It will override the existing jar file with the new class added.

I have not tried this but there is an update attribute in the jar task
 
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Yes, the update attribute should do the trick. Keep in mind that it can be quite slow with big jar files.
 
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