Identifying Entities

Use the @Entity annotation to specify that a class is an entity.

Note:

The entity class must also be listed in your persistence.xml file, unless you set the tag <exclude-unlisted-classes> to false. An entity can also be defined using an orm.xml file and the <entity> tag.

For more information, see Chapter 2 "Entities" in the JPA Specification.

http://jcp.org/en/jsr/detail?id=317