Where did you read about home interfaces ? These are used for EJB2.x. That's a bit long to explain. Basically, there's a home interface that the client will get from JNDI. From this home interface, the client will be able to get a bean, actually a component interface to the bean. It looks like :
In your example, you are declaring an EJB3 local business interface. The requirements to declare both home and component interfaces has been removed in EJB3. You now only need to declare one business interface, annotated either by @Local or by @Remote.