Updating a JAR that uses packages

Hi There,
I have a problem in that I am trying to update a class within a JAR which uses packages. The issue is that when updating the JAR, the class I have requested to update is simply placed in the root of the JAR and not in the required package.
I need to to this within a Java program, so unpacking and re-packing the JAR is not an option.
Here is what i've been trying:
I have a class called UserProfile.class, which resides within my messages package - Structure: /messages/UserProfile.class
When I call the update command:
jar uf C:\AdminUI.jar E:\project\code\Eclipse_Proj\messages\UserProfile.class
It creates the folder structure /project/code/Eclipse_Proj/messages within the JAR file and places UserProfile.class within this folder - when in fact the UserProfile.class should be placed within the /messages folder.
Any ideas on how I can place the class in the correct folder would be much appreciated.
Thanks very much
K
null

Thanks for the reply!
Yeah that works, but i'm trying to update the JAR from a Java program using
Runtime.getRuntime().exec()
but when I try to run the command Runtime.getRuntime().exec("cd c:") I get the below exception:
java.io.IOException: CreateProcess: cd c: error=2
I understand there is a -C parameter to temporarily change directory so I tried the following command:
jar uf C:\AdminUI.jar -C E:\project\code\Eclipse_Proj \messages\UserProfile.class
But this simply inserts the UserProfile.class into a jar under the following directory structure:
project/code/Eclipse_Proj/messages/UserProfile.class
Thanks again for your help.
Any input much appreciated
K

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