While it's important to build data validation into as many layers of a Web application as possible.
Tutorial Details:
Java SE 5 brought many needed enhancements to the Java language, none with more potential than annotations. With annotations, you finally have a standard, first-class metadata framework for your Java classes. Hibernate users have been manually writing *.hbm.xml files for years (or using XDoclet to automate this task). If you manually create XML files, you must update two files (the class definition and the XML mapping document) for each persistent property needed.
Using HibernateDoclet simplifies this (see Listing 1 for an example) but requires you to verify that your version of HibernateDoclet supports the version of Hibernate you wish to use. The doclet information is also unavailable at run time, as it is coded into Javadoc-style comments. Hibernate Annotations, illustrated in Listing 2, improve on these alternatives by providing a standard, concise manner of mapping classes with the added benefit of run-time availability.
If you use HibernateDoclet, you won't be able to catch mistakes until you generate the XML files or until run time. With annotations, you can detect many errors at compile time, or, if you're using a good IDE, during editing. When creating an application from scratch, you can take advantage of the hbm2ddl utility to generate the DDL for your database from the hbm.xml files. Important information - that the name property must have a maximum length of 60 characters, say, or that the DDL should add a not null constraint -is added to the DDL from the HibernateDoclet entries. When you use annotations, you can generate the DDL automatically in a similar manner.
While both code mapping options are serviceable, annotations offer some clear advantages. With annotations, you can use constants to specify lengths or other values. You have a much faster build cycle without the need to generate XML files. The biggest advantage is that you can access useful information such as a not null annotation or length at run time.
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