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Need Help on :: Programatically Creating Jar file From Existing Jar file

vijay kurhade
Greenhorn

Joined: Mar 02, 2009
Posts: 2
I am trying to create dummy jar file based on existing jar file; using java.util.Jar package classes like JarFile, JarOutputStream, Manifest class objects.


What I am tryig to do is

I have A.jar file
read A.jar; JarFile
get its manifest object with JarFile.getManifest()

manifest.put("READER", "MyName");

If i specify this manifest in
JarOutputStream(outputstream, manifest);

Get ZipException -> Duplicate META-INF\META-INF.MF entry



What is the best way to achieve creating copy of one jar to another with slight change to manifest file.


Help is Appreciated
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 39828
    
  28
Easiest done from the command line, I would think. There should be something in the Java Tutorials; there is a section about modifying the manifest file.
Bert Bates
author
Sheriff

Joined: Oct 14, 2002
Posts: 8883
    
    5
intermediate level


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subject: Need Help on :: Programatically Creating Jar file From Existing Jar file