Jar File ^new^: Decompile

Because Java compiles source code ( .java ) into bytecode ( .class ) files, it retains a significant amount of metadata and structure. This makes Java bytecode relatively easy to reverse engineer compared to native machine code.

Tools like Enigma or Krakatau are specifically built to handle "obfuscated" JARs (where variable names are replaced with nonsense characters to prevent reverse engineering). They help create "mappings" to rename these fields back into something readable.