Aspect oriented programming

Commons DataBase Connection Pools - Library of the Apache foundation offering pooling implementations of the DataSource interface.

Create, Read, Update, Delete - Basic persistence operations

Data Access Object - Pattern to separate persisting logic from the object to be persisted

Pattern to hand a component's dependency to the component from outside, freeing the component to lookup the dependant itself. For more information see http://en.wikipedia.org/wiki/Dependency_Injection.

Object relational mapper implementing JPA - http://www.eclipselink.org

Object relational mapper implementing JPA - http://www.hibernate.org

Java Persistence Api

Java application framework - http://www.springframework.org