Question

The javadoc says

A unique generator name that can be
referenced by one or more classes to
be the generator for primary key
values

But its annotation that is put on top of @Entity, so I don’t understand the reasoning.

Can I use in @Entity @SequenceGenerator defined in other @Entity?

Answer 1

The idea is that multiple entities might want to share a key space.

For example if you have two entities Foo and Bar you’d want to avoid having both a Foo with id 1 and a Bar with id 1. You’d do that by specifying the same name for their @SequenceGenerator annotations.