IO.popen with mergeEnv containing nil value raises NullPointerException

[samwgoldman]

Given the following cgi application:

#!/usr/bin/env ruby

require "cgi"

cgi = CGI.new

cgi.out("nph" => true, "type" => "text/plain", "status" => "OK") do
  ENV["INPUT"]
end

and following test raises NullPointerException instead of printing Hello World!:

env = {
  "REQUEST_METHOD" => "GET",
  "CONTENT_LENGTH" => "0",
  "INPUT" => "Hello, World!",
  "ANYTHING_NIL" => nil
}

IO.popen([env, "./cgi.rb"], "r") do |cgi|
  puts cgi.read
end

The exception is raised on line 242 of ShellLauncher.java, presumably on e.getValue().toString().

MRI and Rubinius do not crash on this test.