JRuby Complex Classes in Java Method Signatures

error

NoMethodError: undefined method `start_with?' for #<Java::OrgJrubyAstJava_signature::ReferenceTypeNode:0x3b9fa8f7>
    as_java_type at /opt/jruby-1.7.4/lib/ruby/shared/jruby/compiler/java_signature.rb:20
      parameters at /opt/jruby-1.7.4/lib/ruby/shared/jruby/compiler/java_signature.rb:48
            each at file:/opt/jruby-1.7.4/lib/jruby.jar!/jruby/java/java_ext/java.util.rb:7
             map at org/jruby/RubyEnumerable.java:713
      parameters at /opt/jruby-1.7.4/lib/ruby/shared/jruby/compiler/java_signature.rb:48
           types at /opt/jruby-1.7.4/lib/ruby/shared/jruby/compiler/java_signature.rb:54
  java_signature at /opt/jruby-1.7.4/lib/ruby/shared/jruby/core_ext/class.rb:44
             Foo at lib/example.rb:12
          (root) at lib/example.rb:11

example(1).rb

require 'jruby/core_ext'
 
class Foo

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

Foo.become_java!.declared_methods.each { |m|
  puts m
}

example(2).rb

require 'jruby/core_ext'

class MyClass
    attr_accessor :b

    def initialize(b)
        @b = b
    end
end

class Foo

  java_signature 'void bar(int, MyClass)'
  def bar(a, my_class)
    puts a + my_class.b
  end
  
end

Foo.become_java!.declared_methods.each { |m|
  puts m
}

example(3).rb

require 'jruby/core_ext'

class MyClass
    attr_accessor :b

    def initialize(b)
        @b = b
    end
end

class Foo

  add_method_signature('bar', [java.lang.Void, Java::java.lang.Integer::TYPE, MyClass.become_java!(false)])
  def bar(a, my_class)
    puts a + my_class.b
  end
  
end

Foo.become_java!.declared_methods.each { |m|
  puts m
}