[jruby-user] jruby call method from super java class

I am trying to create a subclass in jruby which overrides the keys
method from the super java class properties cause i want to sort the
entries in the properties class by the keys:

class SortedProperties < java.util.Properties
 def keys
  keysEnum = super().keys()
  keyList = java.util.Vector.new
  keysEnum.elements.each do |element|
    puts element.to_s
    keyList.add(element.to_java(:String))
  end
  java.util.Collections.sort(keyList)
  puts keyList.elements().to_s
  return keyList.elements()
 end
end

I am doing definitly something wrong with the super statement but i
don't know what. Searched a lot but can't find anything that points me
to the correct call of the method keys() in the super class properties.

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