References
Predefined Beans
Predefined Bean | Resource or CDI Bean | Injection Example |
---|---|---|
UserTransaction | Resource | @Resource UserTransaction transaction; |
Principal | Resource | @Resource Principal principal; |
Validator | Resource | @Resource Validator validator; |
ValidatorFactory | Resource | @Resource ValidatorFactory factory; |
HttpServletRequest | CDI bean | @Inject HttpServletRequest req; |
HttpSession | CDI bean | @Inject HttpSession session; |
ServletContext | CDI bean | @Inject ServletContext context; |
Predefined beans are injected with dependent scope and the predefined default qualifier @Default
.
Resource Injection
Resource injection enables you to inject any resource available in the JNDI namespace into any container-managed object, such as a servlet, an enterprise bean, or a managed bean. For example, you can use resource injection to inject data sources, connectors, or custom resources available in the JNDI namespace.
For example, the following code injects a data source object that provides connections to the default Java DB database shipped with GlassFish Server:
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