SIP Servlet POJOs are instantiated by the procedure to create a non-contextual instance that is not managed by the CDI container. The exact procedure is explained at the end of section titled “Support for Dependency Injection" in the Java EE specification.The POJO life-cycle closely follows those of other component classes in terms of instantiation and destruction. Thus, shortly after resource and CDI injection completes successfully, the @PostConstruct callback is invoked. Similarly, the @PreDestroy annotation may be applied to one method that is called when the class is taken out of service and is longer be used by the container. Otherwise, the load-on-startup behavior of SIP Servlets applies to SIP Servlet POJOs as well. The behavior can be specified either in the @SipServlet annotation or in the deployment descriptor.