Gradle Project not detected in eclipse

I’ve this project structure:

As you can see, it has Gradle nature. I’ve set it on gradle eclipse plugin:

eclipse {
    project {
	    name = 'OAuthz Library'
	    natures 'org.eclipse.buildship.core.gradleprojectnature'

Nevertheless, Eclipse is showing me nothing on Gradle Build Tasks:

It’s telling me there’s no gradle projects in workspace.

Any ideas?

You need to use Buildship to import the project. You don’t need to add the Buildship nature yourself, Buildship does that for you already.