AUTO

Indicates that the persistence provider should pick an appropriate strategy for the particular database.

• For a primary key of type java.util.UUID or String, this is equivalent to GenerationType.UUID.
• For a primary key of type Long, Integer, long, or int, the provider selects between GenerationType.TABLE, GenerationType.SEQUENCE, and GenerationType.IDENTITY.

The AUTO generation strategy may expect a database resource to exist, or it may attempt to create one. A vendor may provide documentation on how to create such resources in the event that it does not support schema generation or cannot create the schema resource at runtime.