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In practical purpose, domain and model are the same, while entity is also a domain/object that would be used to store in the database. Some people are tried to re-explain such topics but none of them are canon.
Entities represent domain objects and are primarily defined by their identity, continuity, and persistence over time, and not only by the attributes that comprise them.
Using JPA, you can designate any POJO class as a JPA entity–a Java object whose nontransient fields should be persisted to a relational database using the services of an entity manager obtained from a JPA persistence provider (either within a Java EE EJB container or outside of an EJB container in a Java SE application ...
A domain object is an entity in the domain layer of your application, eg. an Address class. "Model" means the same thing - an entity in the "Domain Model". A POCO (plain old CLR object) is an object that has no behaviour (methods) defined, and only contains data (properties).
Are domain objects the same as JPA entities? If I have a value object (e.g. a dollar bill), how can I (or even should I) store that in the datastore as a reference object?
What are the subtleties of domain objects being entities in some cases and value objects in other cases? Could anyone direct me to a good paper on this?
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