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How can I decompile a JAR (.class binary files) into .java source files from command prompt?
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How to Convert a JAR File. You can decompile a JAR file's CLASS files to Java files with the help of JavaDecompilers.com.
You can use a decompiler to do so. One of the most major ones is JD-GUI. JD-Core is a library that reconstructs Java source code from one or more “. class” files.
In order to decompile class file, just open any of your Java projects and go to Maven dependencies of libraries to see the jar files included in your project. Just expand any jar file for which you don't have the source attached in Eclipse and click on the . class file.
Unless you explicitly packaged your source code in the JAR file, there's no way to get back the original source. You could try using a decompiler (like this) but that will hardly give you nice, readable code. The best solution would be to stop using your computer right now.
I found that jd-cmd does the job just fine, and works recursively in sub-folders for multiple files. To decompile a group of files on the command line, run the following commands:
README.md file.java -jar jd-cli.jar -od <my-output-folder> <my-input-folder>.
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