On persistence using CMP, JDBC, JDP etc.. v/s OFBIZ Entity Engine. Any thoughts !! Looks great ...

http://www.ofbiz.org/core/docs/entity.html

The OFBIZ entity engine uses a number of Business Tier and Integration Tier patterns that will be recognized by most enterprise software programmers. Many Presentation Tier patterns are also used in the Open For Busienss project, but only in the servlet controller, not in the entity engine. The patterns used in the Entity Engine include: Business Delegate, Value Object, Composite Entity (variation), Value Object Assembler, Service Locator, and Data Access Object. Implementations of other patterns and more complete implementations of these Patterns are planned.