I have some questions that I did not found in the docs:

1. Can I map a View instead of a table? If so, how can I map it without ID, being that views don't have ID?
2. If I already have a view, and I can't map it... will I have to create a table, or there's another way?
3. In an ordinary table, can I not have an ID?

views can be treated just like any other table. you would need to define an id property in your mapping to the view as it is required by hibernate. if your view or table doesn't have a primary key then you might look at defining a composite key composed of all columns. you might want to search this forum about this topic, i've seen numerous postings about it before.