Sams Teach Yourself BEA WebLogic Server 7.0™ in 21 Days

Q&A

Q1:

In servlet chaining, if the servlet to which the request is to be delegated is not loaded—that is, not active in the WebLogic Server—what will happen?

A1:

If the servlet to which the request is forwarded is not active in the WebLogic Server, the ServletContext object's method getServlet(servletname) will return a null object reference. To safeguard against this scenario, the calling servlet should check whether the called servlet object's reference is valid. In a scenario where the called servlet is not active, the calling servlet can still forward the request to the called servlet in a roundabout way. The calling servlet is allowed to open socket connections. Hence, it can open a java.net.URLConnection() object that passes the URL of ...