HiberanteAnnotations
Hibernate Annotations Support for 6.5
This document gives a brief description about how Hibernate Annotations can be supported in Netbeans IDE.
- Hibernate Annotations are to replace Hibernate Mapping XML files with inline meta data.
- Hibernate Annotations support auto completion as we type in the IDE and they are type safe.
- In order to support Hibernate Annotations,
- hibernate-annotations.jar
- hibernate- commons-annotations.jar
- ejb3-persistence.jar (in the case of J2SE projects) are required to be placed in the project class path.
- Hibernate reverse engineering feature generates POJOs with annotations. During the generation,
- If the user picks both HBM, POJOs with EJB3, then the configuration file should be updated
with the hbm files.
- If the user checks only the POJOs with EJB3 annotations without HBM xml files, then the
configuration file should be updated with the annotated classes.
Eg:
<hibernate-configuration> <session-factory> ..... <mapping class="travel.Person"/> <mapping class="travel.Trip"/> </session-factory> </hibernate-configuration>
- When the user creates HibernateUtil, an instance of sessionFactory should be taken from AnnotationConfiguration instead of Configuration object.
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
// Create the SessionFactory from standard (hibernate.cfg.xml)
// config file.
sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Log the exception.
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
It is also possible to add the annotated classes using the programmatic API.
Eg:
sessionFactory = new AnnotationConfiguration()
.addPackage("travel") //the fully qualified package name
.addAnnotatedClass(travel.Person.class)
.addAnnotatedClass(travel.Trip.class)
configure()..buildSessionFactory();
Since AnnotationConfiguration is a subclass of Configuration, the HibernateUtil java class template needs to be updated to use AnnotationConfiguration.
