Java EE 5 and 6 support the injection of annotations into
your source code, so that you can embed resources, dependencies, services,
and lifecycle notifications in your source code, without having to
maintain these artifacts elsewhere. Annotations simplify the development
and configuration of enterprise applications.
About this task
You can add annotations into your source code by using
the Annotations view or by adding the annotation directly in the Java™ editor.
Procedure
-
Determine which annotations to add to your web application.
Table 1. Annotations supported by Java EE 5 web applications. This table describes common, EJB, and web service annotations
for use in web applications.
| Annotation type |
Annotation |
Description |
| Common annotations |
@Resource |
The Resource annotation declares a reference
to a resource that is required by the application. |
@Resources |
The Resources annotation declares multiple resources
declarations. |
@DeclaresRoles |
The DeclaresRoles annotation specifies the security
roles for the application. |
@RunAs |
The RunAs annotation specifies the role of the
application during run time. |
@PostConstruct |
The PostConstruct annotation specifies the container
that will start after resource injection is complete to perform any
initialization. |
@PreDestroy |
The PreDestroy annotation is used to signal
that the instance is in being removed by the container. |
| EJBs |
@PersistenceContext |
The PersistenceContext annotation specifies
the container managed entity context. |
@PersistenceContexts |
The PersistenceContexts annotation declares
multiple @PersistenceContext annotations. |
@PersistenceUnit |
The PersistenceUnit annotation specifies a reference
to an entity manager factory for use with EJBs. |
@PersistenceUnits |
The PersistenceUnits annotation declares multiple
@PersistenceUnit annotations. |
| Web services |
@WebServiceRef |
The WebServiceRef annotation specifies a reference
to a web service within a web application. |
@WebServicesRefs |
The WebServicesRefs annotation declares multiple
@WebServiceRef annotations. |
-
Add annotations in the source code by using the Annotations
view or by adding the annotation directly in the Java editor.
What to do next
For more information about web tier resource injection, refer
to: