Debugging Grails 3, Spring Boot or Gradle with Eclipse

This is a small post for those who’s primary IDE is Eclipse for developing Grails 3 apps or plugins — and are still wondering how to debug their application.

First of all, to clarify: there’s no “Grails” debugging, it’s just Spring Boot and Gradle these days, with Grails 3. Any way to debug these kind of applications allows you to debug a Grails 3 application.

There’s lots of SO posts and Google hits about this subject, so I’m creating this post also as a short “simplest solution” summary for myself and for others.
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