modifying an existing jar file using ant

[gaurav abbi]

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.

[karthikeyan Chockalingam]

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

<jar jarfile="${jarlocation}/abc.jar" update="true">

[Ilja Preuss]

Yes, the update attribute should do the trick. Keep in mind that it can be quite slow with big jar files.