Jdeveloper 11.1.1.3 not recognizing java package

Weird, I do
"new java package"
enter the name (com.acme.bla)
click on OK

nothing happens. The folder is not created. In the Application Navigator it doesn't show.

I create the folder manually, refresh Application Navigator, nothing, it doesn't show.

If I create manually a Java class and put into that folder, magically the package appears in Application Navigator.