Hibernate

Hibernate is great piece of java software, which utilize concept ORM – Object Relational Mapping. If application needs to store data into relational database, it simplifies development tremendously. One don’t need to use SQL queries, unless needs to do something very special. Hibernate has drivers supporting all major databases, so it’s easy to switch database. There are plenty of resources, including youtube tutorials, like JavaBrains. There is also Hibernate OGM (Object/Grid Mapper), which provides Java Persistence (JPA) for NoSQL data.