Hello everybody... I'm doing homework of servlet advanced chapter of Sang
Shin's course and I try just to log the invocation to the methods
"attributeAdded" and "attributeRemoved" both from
HttpSessionAttributeListener class.
Inside the body of the servlet I add a new attribute to the request as this:
*...
if ((username != null) && (username.length() > 0)) {
RequestDispatcher dispatcher =
getServletContext()
.getRequestDispatcher("/response");
String foo = "bar";
request.setAttribute("new_attr", foo);
if (dispatcher != null) {
dispatcher.include(request, response);
}
}
...*
Simple, isn't it? and I remove this attribute in this part of the code:
*
...
PrintWriter out = response.getWriter();
request.removeAttribute("new_attr");
// then write the data of the response
String username = request.getParameter("username");
...*
Of course I have implemented the methods:
...
*public class OleServListener implements ServletContextListener,
HttpSessionAttributeListener {
ServletContext sc;
public void contextInitialized(ServletContextEvent sce) {
sc = sce.getServletContext();
sc.log("contextInitialized invoked.");
}*
...
* public void attributeAdded(HttpSessionBindingEvent se) {
sc.log("Adding attr " + se.getName () +
" with value " + se.getValue ());
}
public void attributeRemoved(HttpSessionBindingEvent se) {
sc.log("Removing attr " + se.getName () +
" with value " + se.getValue ());
}*
...
And here is the problem. I execute the servlet but in the glassfish log I
don't get the messages from attributeAdded neither attributeRemove. I'm an
absolute beginner with servlets so I suppose it's probably a simple error (I
hope). I have check that the foo attribute it's being added printing it's
value with System.out.println(request.getAttribute("new_attr").toString(),
and as I expected, I get "bar" in glassfish's log.
Have you any suggestions please?
Thank you very much.
--
David
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