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Hibernate
Hibernate has gained popularity in the past few years as an add-on for J2EE and other applications. Its Web site (www.hibernate.org) advertises this free product as “a powerful, ultra-high performance object/relational persistence and query service for Java”. Using Hibernate, you do not need to implement your own persistence layer. Instead, you use a tool to create databases and related tables and determine how your objects should be persisted. Hibernate virtually supports all kinds of database servers in the market today, and its Hibernate Query Language provides “an elegant bridge between the object and relational worlds”.
More people will be using Hibernate in the near future, and it is definitely worth more than a look. If you have time, invest in it.