Implementing a Java interface on the JRuby generated .class/.java file

Question

I'm trying to implement a Java interface in a JRuby class, like this:

require 'java'
java_package 'net.jruby.test'
java_import "net.jruby.test.Service"

class RubyService
  include Service

  java_signature 'int sum(int, int)'
  def sum(a,b)
    a + b
  end
end

The net.jruby.test.Service interface is dead simple:

package net.jruby.test;

public interface Service
{
  int sum(int a, int b);
}

After that I generate the .java class file with:

jrubyc --java ruby_service.rb

But the generated .java file (and consequently the .class file) do not implement the interface, look:

public class RubyService extends RubyObject  {

Is there any way to achieve this?

I've asked in the IRC channel and the mailing list with no (at least immediate) luck, so please don't point me there, I know those options — Pablo Fernandez
– Pablo Fernandez, Commented Mar 6, 2011 at 0:04

Pablo Fernandez · Accepted Answer · 2011-03-06 02:18:40Z

12

Found the answer, instead of this:

include Service

I needed this:

java_implements 'Service'

answered Mar 6, 2011 at 2:18

Pablo Fernandez

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2 Comments

Kenrick Chien Over a year ago

Do you recall where you found this?

Pablo Fernandez Over a year ago

"Using JRuby" book, I think.

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