Try Grails. It's a framework modeled after Django, written in Groovy. Groovy is a JVM based language, source-compatible with Java.
To get a Django-like admin interface, you write your models, let Grails generate all the rest (controllers and views), and you're done.
Some resources:
Spring ROO is probably what you are looking for - it's a pure Java solution.
What you mean is CRUD generating (CRUD: create, read, update, delete = typical admin interface). For example Rife can do this.