```ruby
require "language/java"

class JavaRequirement < Requirement
  fatal true
  cask "java"
  download "http://www.oracle.com/technetwork/java/javase/downloads/index.html"

  satisfy :build_env => false do
    return quiet_system "java", "-version" unless OS.mac?
    args = %w[--failfast]
    args << "--version" << "#{@version}" if @version
    @java_home = Utils.popen_read("/usr/libexec/java_home", *args).chomp
    $?.success?
  end

  env do
    java_home = Pathname.new(@java_home)
    ENV["JAVA_HOME"] = java_home
    ENV.prepend_path "PATH", java_home/"bin"
    if (java_home/"include").exist? # Oracle JVM
      ENV.append_to_cflags "-I#{java_home}/include"
      ENV.append_to_cflags "-I#{java_home}/include/darwin"
    else # Apple JVM
      ENV.append_to_cflags "-I/System/Library/Frameworks/JavaVM.framework/Versions/Current/Headers/"
    end
  end if OS.mac?

  def initialize(tags)
    @version = tags.shift if /(\d\.)+\d/ === tags.first
    super
  end

  def message
    version_string = " #{@version}" if @version

    s = "Java#{version_string} is required to install this formula."
    s += super
    s
  end

  def inspect
    "#<#{self.class.name}: #{name.inspect} #{tags.inspect} version=#{@version.inspect}>"
  end
end
```

Fix a bug for Linuxbrew
user
```ruby
require "language/java"

class JavaRequirement < Requirement
  fatal true
  cask "java"
  download "http://www.oracle.com/technetwork/java/javase/downloads/index.html"

  satisfy :build_env => false do
    next quiet_system "java", "-version" unless OS.mac?
    args = %w[--failfast]
    args << "--version" << "#{@version}" if @version
    @java_home = Utils.popen_read("/usr/libexec/java_home", *args).chomp
    $?.success?
  end

  env do
    java_home = Pathname.new(@java_home)
    ENV["JAVA_HOME"] = java_home
    ENV.prepend_path "PATH", java_home/"bin"
    if (java_home/"include").exist? # Oracle JVM
      ENV.append_to_cflags "-I#{java_home}/include"
      ENV.append_to_cflags "-I#{java_home}/include/darwin"
    else # Apple JVM
      ENV.append_to_cflags "-I/System/Library/Frameworks/JavaVM.framework/Versions/Current/Headers/"
    end
  end if OS.mac?

  def initialize(tags)
    @version = tags.shift if /(\d\.)+\d/ === tags.first
    super
  end

  def message
    version_string = " #{@version}" if @version

    s = "Java#{version_string} is required to install this formula."
    s += super
    s
  end

  def inspect
    "#<#{self.class.name}: #{name.inspect} #{tags.inspect} version=#{@version.inspect}>"
  end
end
```
assistant