I downloaded Grails 2.4.4 and created a test project (using NetBeans) and it was successful.
I downloaded Grails 3.0.1 and created a test project (using NetBeans) NetBeans says project created successfully but it did not load the project in to project explorer.
I compared Groovy folders of 2.4.4 and 3.0.1 and noticed that few folders are missing in the installation.
I confirmed that I downloaded the correct package.
These are the folders/files missing in Grails 3.0.1
folders conf, doc, plugins, script
files build.properties, readme
Grails 3.0 was a complete re-write of Grails and lots of things have changed. Not the least of which is the folder and file structure. Since Grails 3.0 is based on Spring Boot and Gradle a lot of what was very Grails specific has been removed and replaced with both of these.
This blog entry gives a good amount of detail on what has changed in Grails 3.0. It even talks about directory/file structures.
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