Grails Intellij common fixes for spurious, crazy build behaviours and other issues.

GRAILS:

Try deleting the work folder and rerun the build

<Project path>\target\work folder.

Above should solve most of the issues if it didnt

Try also deleting the cache folder or the whole contents
<homedirectory>/.grails /version

INTELLIJ:

For all crazy intellij issues,

Click on File --> Invalidate Caches/Restart