Vim: set path to working directory

Add the following to .vim


" Add the current file's directory to the path if not already present.
BufRead *
  \ let s:tempPath=escape(escape(expand("%:p:h"), ' '), '\ ') |
  \ exec "set path+=".s:tempPath

Ref: Set working directory to the current file

With previous make and javac binding, you can compile and execute Java code from vim with
  :mak
  :!java FILENAME

Vim: Binding :make and javac

Add the following to your .vimrc

filetype on
autocmd FileType java set makeprg=javac\ %

You can make .java files with :make command.
To view errors, try ":cope", ":ccl", ":cc", ":cn", ":cp", etc.