1.- Eclipsify and import the Project.
2.- Go to Debug configurations.
3.- Remote Java Application > New
	3.1.- Choose the Play Project
    3.2.- Host: localhost (or 127.0.0.1)
    3.3.- Port: 9999
4.- Open a Terminal and type: play debug run
5.- Back on Eclipse, run the Debug Configuration you just created.
6.- Open the application on a browser (localhost:9000)

Now you can use breakpoints in Eclipse.