how to Upgrade Grails from Grails 2.4.4 to Grails 3.3.6?

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I need to upgrade my grails application from 2.4.4 to 3.3.6. is there any smart way to do it or any kind of help if you can share your experience.

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Tuomas Valtonen On BEST ANSWER

Always follow the official upgrade guides.

There are upgrade guides from 2.x -> 3.2 and then from 3.2 -> 3.3

So you need to perform upgrade in 2 separate steps.