# File lib/jammit.rb, line 180
  def self.check_java_version
    return true if @checked_java_version
    java = @compressor_options[:java] || 'java'
    @css_compressor_options[:java] ||= java if @compressor_options[:java]
    version = (`#{java} -version 2>&1`)[/\d+\.\d+/]
    disable_compression if !version ||
      (@javascript_compressor == :closure && version < '1.6') ||
      (@javascript_compressor == :yui && version < '1.4')
    @checked_java_version = true
  end