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With the coming of JPA, most of this information is now defined in a way that is portable across ORM/JPA providers using annotations (and/or standardized XML format).This chapter will focus on JPA mapping where possible.

As a JPA provider, Hibernate implements the Java Persistence API specifications and the association between JPA interfaces and Hibernate specific implementations can be visualized in the following diagram: Ultimately the application domain model is the central character in an ORM. Hibernate works best if these classes follow the Plain Old Java Object (POJO) / Java Bean programming model.

However, none of these rules are hard requirements.

The Implicit Naming Strategy would only be applied if an explicit name was not given. The default implementation is to simply use the logical name as the physical name. If that implicit naming rule does not meet your requirements, you can explicitly tell Hibernate (and other providers) the column name to use.

However applications and integrations can define custom implementations of this Physical Naming Strategy contract. We said before that a Hibernate type is not a Java type, nor a SQL type, but that it understands both and performs the marshalling between them.

New users may want to first look through the Hibernate Getting Started Guide for basic information as well as tutorials.

There is also a series of topical guides providing deep dives into various topics.

If JPA provider portability is important, applications should prefer not to specify a Physical Naming Strategy. String Utils; /** * An example Physical Naming Strategy that implements database object naming standards * for our fictitious company Acme Corp. JPA defines this as "a hint", which essentially means that it effect is specifically required.

When an entity does not explicitly name the database table that it maps to, we need to implicitly determine that table name. * Basic value types usually map a single database column, to a single, non-aggregated Java type. As long as the type is not primitive, Hibernate takes this to mean that the underlying column should be Defines whether this attribute should be fetched eagerly or lazily.

Vlad Mihalcea, Steve Ebersole, Andrea Boriero, Gunnar Morling, Gail Badner, Chris Cranford, Emmanuel Bernard, Sanne Grinovero, Brett Meyer, Hardy Ferentschik, Gavin King, Christian Bauer, Max Rydahl Andersen, Karel Maesen, Radim Vansa, Louis Jacomet Working with both Object-Oriented software and Relational Databases can be cumbersome and time consuming.

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