gistfile1.rb

[mark@Marks-MacBook-2:tmp/jrubyc-test]$ cat foo.rb                                                                                                                  

require 'java'
java_require 'foo'

class Foo
  java_signature 'void main(String[])'
  def self.main(args)
    bar(args[0], args[1])
  end

  java_signature 'void bar(int, int)'
  def self.bar(a,b)
    puts a.to_i + b.to_i
  end
end

[mark@Marks-MacBook-2:tmp/jrubyc-test]$ java -cp /Users/mark/tmp/jruby-1.5.0.dev/lib/jruby.jar:. Foo 1 2                                                            
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: org.jruby.exceptions.RaiseException: use `java_import' to load normal Java classes
	at (unknown).new(:1)
	at (unknown).(unknown)(:1)
[mark@Marks-MacBook-2:tmp/jrubyc-test]$