Decompile & recompile single file from jar

Question

This problem has been solved witht he help of the comments:

It was necessary to recompile the java with the correct target version. In my case javac -source 1.3 -target 1.3 instead of simply javac did the trick.

Problem Description:

I have a compiled .jar java program in which a single url string needs to be modified. Using JD I was able to decompile the code and make the changes.

As I would like to avoid having to recompile the entire project I thought I could simply recompile the single .java file I modified into a .class and replace the original with it.

However, after repackaging the jar, the program does start but the functionality making use of the code I modified behaves erratically.

In the log I find:

E EventDispatchThreadExceptionHandler:Unhandled exception occurred during event dispatching.::
java.util.MissingResourceException: Can't find bundle for base name com.myCompany.mySoftware.resources.ModuleResources, locale en_US
       at java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:842)

ModuleResources.java is the file I modified...

Analysis of the problem:

1. Repackageing is not at fault: if I extract and repackage the original jar, everything works.
2. My modification does equally not seem to be the problem: when I recompile the JD-decompiled java file and use the resulting class file for repackaging, I get the same failure.

I decompiled the repackaged jar file and compared it with the decompilation of the original jar file: In the file I modified (at least) the code seems to be identical BUT JD shows different line numbers. Could that hint at the problem?

Any help would be greatly appreciated.

Many thanks!

Answer 1

This is the old question.

Nowadays, I found the good method to decompile and repack the jar file.

Here is the good document.

https://www.talksinfo.com/how-to-edit-class-file-from-a-jar/

I recommend the third method in the document.!!!