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Understanding object/relational persistence
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manager interfaces, and the query language. This second part is called Java Persistence API (JPA), probably because its interfaces are in the package javax.persistence. We ll use this acronym throughout the book. This separation also exists in EJB 3.0 products; some implement a full EJB 3.0 container that supports all parts of the specification, and other products may implement only the Java Persistence part. Two important principles were designed into the new standard:
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JPA engines should be pluggable, which means you should be able to take
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out one product and replace it with another if you aren t satisfied even if you want to stay with the same EJB 3.0 container or Java EE 5.0 application server.
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JPA engines should be able to run outside of an EJB 3.0 (or any other) runtime environment, without a container in plain standard Java.
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The consequences of this design are that there are more options for developers and architects, which drives competition and therefore improves overall quality of products. Of course, actual products also offer features that go beyond the specification as vendor-specific extensions (such as for performance tuning, or because the vendor has a focus on a particular vertical problem space). Hibernate implements Java Persistence, and because a JPA engine must be pluggable, new and interesting combinations of software are possible. You can select from various Hibernate software modules and combine them depending on your project s technical and business requirements. Hibernate Core The Hibernate Core is also known as Hibernate 3.2.x, or Hibernate. It s the base service for persistence, with its native API and its mapping metadata stored in XML files. It has a query language called HQL (almost the same as SQL), as well as programmatic query interfaces for Criteria and Example queries. There are hundreds of options and features available for everything, as Hibernate Core is really the foundation and the platform all other modules are built on. You can use Hibernate Core on its own, independent from any framework or any particular runtime environment with all JDKs. It works in every Java EE/J2EE application server, in Swing applications, in a simple servlet container, and so on. As long as you can configure a data source for Hibernate, it works. Your application code (in your persistence layer) will use Hibernate APIs and queries, and your mapping metadata is written in native Hibernate XML files.
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Object/relational mapping
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Native Hibernate APIs, queries, and XML mapping files are the primary focus of this book, and they re explained first in all code examples. The reason for that is that Hibernate functionality is a superset of all other available options. Hibernate Annotations A new way to define application metadata became available with JDK 5.0: type-safe annotations embedded directly in the Java source code. Many Hibernate users are already familiar with this concept, as the XDoclet software supports Javadoc metadata attributes and a preprocessor at compile time (which, for Hibernate, generates XML mapping files). With the Hibernate Annotations package on top of Hibernate Core, you can now use type-safe JDK 5.0 metadata as a replacement or in addition to native Hibernate XML mapping files. You ll find the syntax and semantics of the mapping annotations familiar once you ve seen them side-by-side with Hibernate XML mapping files. However, the basic annotations aren t proprietary. The JPA specification defines object/relational mapping metadata syntax and semantics, with the primary mechanism being JDK 5.0 annotations. (Yes, JDK 5.0 is required for Java EE 5.0 and EJB 3.0.) Naturally, the Hibernate Annotations are a set of basic annotations that implement the JPA standard, and they re also a set of extension annotations you need for more advanced and exotic Hibernate mappings and tuning. You can use Hibernate Core and Hibernate Annotations to reduce your lines of code for mapping metadata, compared to the native XML files, and you may like the better refactoring capabilities of annotations. You can use only JPA annotations, or you can add a Hibernate extension annotation if complete portability isn t your primary concern. (In practice, you should embrace the product you ve chosen instead of denying its existence at all times.) We ll discuss the impact of annotations on your development process, and how to use them in mappings, throughout this book, along with native Hibernate XML mapping examples. Hibernate EntityManager The JPA specification also defines programming interfaces, lifecycle rules for persistent objects, and query features. The Hibernate implementation for this part of JPA is available as Hibernate EntityManager, another optional module you can stack on top of Hibernate Core. You can fall back when a plain Hibernate interface, or even a JDBC Connection is needed. Hibernate s native features are a superset of the JPA persistence features in every respect. (The simple fact is that
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