commit https://github.com/vim/vim/commit/81661fb86801e6d6e5194b43dfd27d73fcc016ec Author: Bram Moolenaar <Bram@vim.org> Date: Thu Feb 18 22:23:34 2016 +0100 patch 7.4.1351 Problem: When the port isn't opened yet when ch_open() is called it may fail instead of waiting for the specified time. Solution: Loop when select() succeeds but when connect() failed. Also use channel logging for jobs. Add ch_log().

" Vim compiler file
" Compiler:	javac
" Maintainer:	Doug Kearns <dougkearns@gmail.com>
" Last Change:	2004 Nov 27

if exists("current_compiler")
  finish
endif
let current_compiler = "javac"

if exists(":CompilerSet") != 2		" older Vim always used :setlocal
  command -nargs=* CompilerSet setlocal <args>
endif

CompilerSet makeprg=javac

CompilerSet errorformat=%E%f:%l:\ %m,%-Z%p^,%-C%.%#,%-G%.%#