Core J2EE™ Patterns: Best Practices and Design Strategies

Business and Integration Tiers Bad Practices

Mapping Object Model Directly to Entity Bean Model

Problem Summary

One of the common practices in designing an EJB application is to map the object model directly into entity beans; that is, each class in the object model is transformed into an entity bean. This results in a large number of fine-grained entity beans.

The container and network overhead increases as the number of enterprise beans increases. Such mapping also transforms object relationships into entity-bean-to-entity-bean relationships. This is best avoided, since entity-bean-to-entity-bean relationships introduce severe performance implications.

Solution Reference

Identify the parent-dependent object relationships in the object model ...