Entity bean concepts
An entity bean is used to represent a permanent object such as a customer or an account. In the most common case, the permanent data that represents the state of the enterprise bean is stored in a relational database. The attributes of the object are mapped to rows in one or more tables. Since the state is stored in a database, the state of an enterprise bean persists longer than the request, the session, or even the server or container lifetime. This is why we sometimes say that entity beans survive a server crash.
Although it is most likely a relational database, the data could theoretically come from any type of data source, and entity beans might be an appropriate choice if this data can associate to a specific concept ...
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