def java_types(params)
      return nil if params.nil?

      params.map {|e| e.class.java_class.name }.to_java(:string)
    end
def java_types(params)
      return nil if params.nil?

      params.map {|e| e.class.java_class.name }.to_java(:string)
    end
Convert a collection of java objects to their Java class name equivalents