grails - Add methods to controllers -

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In a Grails application, I would like to add a foo () method for all of my control classes I know that I I can do this with the help of Code: 

  application.controllerClasses.toList () *. MetaClass * .foo = {println 'foo called'}

However, I just do not want to create a plugin for this purpose. Is there anything else I can do this I suspect that this is possible within the closing of init bootstrap.groovy , but I do not know that GrailsApplication How to reach this stop in the example

Thank you, Don 

  def grails application = org. Codehaus.groovy.grails.commons.ApplicationHolder.application

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