Q&A

Q1:What are the coding differences between a bean-managed persistence bean and a container-managed persistence bean?
A1: The following are the coding differences between the two types of entity beans:

  • With BMP, the developer is responsible for writing the database access calls. With CMP, the container is responsible for database access.

  • The BMP bean class is not defined as abstract class. The CMP bean class is defined as an abstract class.

  • The persistent state in a BMP is defined as instance variables. In CMP, you write public abstract accessor methods for persistent and relationship fields.

  • A BMP implements all the finder methods in the bean class. A CMP bean class does not implement the finder methods. The queries for the finder methods are ...

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