Step 1) Right Click on the Project and select “New …”
Step 2) Select from the “Java” Category in Categories on Left …. and then select “Java Class Diagram” as shown below
Step 3) Drag Java classes to the Diagram or create new UML Model and generate objects.
Additionally …looks like you can take your Business Objects in POJO form and create DB entities out of these too. I have yet to test this, will post an update when I do!