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Yaron Telem

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As part of building the infrastructures for a large J2EE project, we've spent the last few months designing and implementing a JDO-based O/R persistency framework. This framework provides our business logic programmers with the following features: an interface-based abstract view of the data-layer with full OO semantics, zero-need knowledge of the object-to-database mapping details, "delta" support, and more. This article presents the persistency framework that we've built on top of JDO, and offers a commentary on the current advantages and shortcomings based on our experience with the JDO specification. Choosing an Object Persistency Layer Choosing the right object persistency layer is a major milestone in almost every J2EE project. Given the state of today's market, you should follow the "buy, don't reinvent" rule (assuming your object persistency demands haven't ... (more)