What are the differences between entity beans which are in the EJB 2.0 specification and entity classes which in the 3.0 specification?
Santosh Kumar Arjunan
In EJB 2, entity was a bean meaning that it had to live in a container and need to be managed (similar to other beans, say stateful, stateless, message driven beans).
However in EBJ 3.x, entity is a POJO class - meaning that it can live outside container also.. plain java application can make use of entities as ORM layer with any providers supporting it..
来源：https://stackoverflow.com/questions/37524680/difference-between-entity-bean-and-entity-class