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Sams Teach Yourself J2EE™ in 21 Days by Peter Roxburgh, Andy Longshaw, Debbie Law, Dan Haywood, Martin Bond

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JDO

The last persistence technology that you will be looking at, Java Data Objects (JDO), aims high and it aims low. That is, it is intended both for use within embedded devices (J2ME) but also for use within J2EE environments. In a J2EE environment, JDO can either supplement or supplant Entity EJBs; if supplementing Entity EJBs, the application of JDO may be hidden if CMP is being employed (that is, the EJB vendor uses JDO but the bean provider is unaware of this), or it can be used by the bean provider directly if BMP is in use.

JDO is the most recent of the Java persistent technologies and, at the time of writing, its specification was still in draft with only an incomplete reference implementation. Moreover, as a technology it seems to be ...

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