Configure Web Application

through web.xml under WEB-INF

Context Parameters

Welcome Files

Mapping Errors to Error Screens

Declaring Resource References

Resources like EJB, data sources, web services, etc. can be injected into web application with annotations.

Restrictions

• only into container-managed objects, e.g. container have control over creation of the component

  • cannot inject into simple POJO

  • but managed bean can accept injection

  • The follows can accept injection:

    • Servlets javax.servlet.Servlet

      • Servlet filters javax.servlet.ServletFilter

      • Event listeners javax.servlet.ServletContextListener

      • javax.servlet.ServletContextAttributeListener

      • javax.servlet.ServletRequestListener

      • javax.servlet.ServletRequestAttributeListener

      • javax.servlet.http.HttpSessionListener

      • javax.servlet.http.HttpSessionAttributeListener

      • javax.servlet.http.HttpSessionBindingListener

      • Managed beans

      • Plain Old Java Objects

  • @Resource is used to declare reference to a resource

    • can be specified on class, method or field

  • @Resources can be used to inject more than one resources

  • @WebServiceRef(wsdlLocation="http://......") static HelloService service; - inject web service