Comparing Entity Beans and Session Beans
Entity beans differ from session beans in several ways. Entity beans are persistent, allow shared access, have primary keys, and may participate in relationships with other entity beans. Table 8.1 shows the differences between session and entity beans.
| Session Bean | Entity Bean |
|---|---|
| Typically contains business process logic, such as sending an e-mail, looking up the stock price from a database, implementing compression and encryption algorithms. They also implement business logic such as workflow, algorithms, and business rules. | Typically represents business entities, such as customers, products, accounts, and orders. |
| Executes a particular business task on behalf of a single client during a single session. | Can be shared by multiple clients. |
| The state is not persistent. | The state is persistent. |
| Usually does not correspond directly to data. | Usually corresponds directly to data. |
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