Updating .jar through WinRAR?

I have a compiled JAR file, but it has a ton of classes that I don't have the source to. I only have the source code to a single class in the JAR, so I recompiled it (no changes) with javac in cmd prompt. Then I opened the JAR file in WinRAR and deleted the old main_class.class and updated it with my recompiled version.

Now every single time I start the program it says "could not find the main class: main_class. Program will exit." I am assuming that updating a JAR file with WinRAR doesn't work so are there any other ways to do it? Sorry, I'm pretty experienced with C++ but have never even touched Java.

Check the path to the "main_class.class" file in the jar. It needs to be the same as before -- probably nothing. It's easy to get that wrong.

Another trick is to rename the extension to '.zip' or add '.zip' to the end, then edit it, then rename back. :o:

Thanks a lot, I'll try out your advice now.

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I opened the JAR file in WinRAR and deleted the old main_class.class and updated it with my recompiled version.

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Do the terms of the license allow you to do that?

db