'Grails upgrade from 2.4 to 4.0

We have a web application running on Grails 2.4 and wish to upgrade to 4.0 so that we will get upgraded to latest spring dependencies . What is the best way to upgrade and below are our questions

  1. Upgrade to 3.0 and then upgrade to 4.0
  2. Directly upgrade to 4.0.
  3. Any step by step document as official documentation is not proper.
grailsgrails-orm


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