Custom fact for finding the version of java installed

java_ver.rb

Facter.add(:java) do
  confine :kernel => "Linux"
  regexp = /\d+\.(\d+)\./

  setcode do
    java = {}
    java['path'] = Facter::Core::Execution.which('java')

    if java['path'] != nil
      p = java['path']
      v = Facter::Core::Execution.exec("#{p} -version 2>&1").lines.first.split('"')
      if v != nil
        if v.length >= 1
          v = v[1]
        end
      end

      java['version'] = v
    else
      Facter.debug("Java not in path!")
    end

    if java['version'] != nil
      mdata = regexp.match(java['version'])
      if mdata != nil
        java['major_version'] = mdata[1]
      end
    end

    if java
      java
    else
      nil
    end

  end
end