How to modify a .java file in .jar file?

Question

I have services.jar file and have few packages inside this jar file. I need to modify the code of one its java classes.

Example - services.jar

Packages inside services.jar - search , util

Classes inside search package - Filter.java - Need to edit this code and need to make a new jar file.

Please guide me.

Answer 1

You can do so if you have the code available with you that you want to modify. If yes, then you have to extract the jar either from command line or using any tool such as winrar. Here is the command to extract the jar from command line:

jar -xvf services.jar

Replace the modified or updated /class file in the extracted directory and recreate the jar using the following command from commandline:

jar -cvf services.jar