problems while generating java code from jruby - jruby

Question

I have problems while generating .java files with jruby 1.7.3. Here is an example:
class Duck
def quack()
puts "quack!";
end
end
def quack_it(duck)
duck.quack
end
a = Duck.new
quack_it(a)
when I execute
jrubyc --java Test.rb I get the following compilation error:
Failure during compilation of file DuckExample_simple.rb:
undefined method `new_method' for nil:NilClass.
Therefore, I have 2 questions:
What is wrong here?
I want to generate .java files in order to see how the JRuby code is translated into the bytecode and instead of reading the bytecode itself I thought to read the java code. Does the generated java code correspond 1 to 1 to the bytecode generated by AOT jruby compiler, or it's better to read the bytecode itself? I actually want to see how jruby handles dynamic method dispatch at the bytecode level. Any hints would be appreciated.

Answer 1

i don't use jruby so i am not really the best guy to talk to, but here are my 2 cents anyways.
if you just put a simple class into the file, it will work. so try
class Duck
def quack()
puts "quack!"
end
end
it will create a Duck.java file as you would expect, which answeres the second question you had. there is also a nice writeup about the generated file here: http://rhnh.net/2012/10/20/guice-in-your-jruby
i guess that the command is somewhat broken. it would be best to open an issue at the jruby issue tracker: http://jira.codehaus.org/browse/JRUBY