This is a configurable version of the vimscript http://www.vim.org/scripts/script.php?script_id=446 that originally used just jad.

When you edit a .class file using vim, this plugin will decompile the class file for you and display it in the current buffer.

Admittedly, the buffer management is not very robust, but it's a very handy plugin nonetheless. How much cooler is it to view decompiled code using your favorite editor than to download a new UI to view Java code in?!

Use your plugin manager of choice.

• Pathogen
  • git clone https://github.com/DanManN/JavaDecompiler-vim ~/.vim/bundle/JavaDecompiler-vim
• Vundle
  • Add Bundle 'https://github.com/DanManN/JavaDecompiler-vim' to .vimrc
  • Run :BundleInstall
• NeoBundle
  • Add NeoBundle 'https://github.com/DanManN/JavaDecompiler-vim' to .vimrc
  • Run :NeoBundleInstall
• vim-plug
  • Add Plug 'https://github.com/DanManN/JavaDecompiler-vim' to .vimrc
  • Run :PlugInstall

Then set g:javad_cmd to a command that decompiles a .class file as input. e.g.

let g:javad_cmd = 'java -jar <path-to>/cfr.jar' # using cfr

or

let g:javad_cmd = 'jad -p' # using jad