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Hello. I am trying to learn J2EE. I've been poking around with the
following which seems like an infinite loop. I know I must be doing something simply stupid, but I can't figure it out. Anyways, my welcome-file, welcome.jsp forwards to gatherer.jsp which then forwards back to welcome.jsp. Sounds like an infinite loop, but welcome.jsp checks to see if a string is null, and this string is suppose to be set in gatherer.jsp. Anyways... here's the code (welcome.jsp, then gatherer.jsp): <jsp:directive.page /> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Passing stuff around.</title> </head> <body> String user = (String) session.getAttribute("user"); if( user == null) { <jsp:forward page="WEB-INF/gatherer.jsp"> <jsp  aram name="doWhat" value="getName" /></jsp:forward> } else { out.println( "Hello there, " + user + ". Nice to meet you."); } </body> </html> Now gatherer.jsp which is in WEB-INF subdirectory: <jsp:directive.page errorPage="/WEB-INF/errorPage.jsp" /> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <body> <% String actionCode = request.getParameter( "doWhat"); session.setAttribute( "user", new String("Fred Flintstone")); out.println( "The action requested was : " + actionCode + ". Heck yeah."); %> <p>Go back to <a href="welcome.jsp">welcome page</a></p> </body> </html> Thanks. |
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DaLoverhino wrote: > Hello. I am trying to learn J2EE. I've been poking around with the > following which seems like an infinite loop. I know I must be doing > something simply stupid, but I can't figure it out. Anyways, my > welcome-file, welcome.jsp forwards to gatherer.jsp which then forwards > back to welcome.jsp. Sounds like an infinite loop, but welcome.jsp > checks to see if a string is null, and this string is suppose to be set > in gatherer.jsp. > > Anyways... here's the code (welcome.jsp, then gatherer.jsp): > Anyway, what exactly is the error, you did not mention. > <jsp:directive.page /> > > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> > > <html> > <head> > <title>Passing stuff around.</title> > </head> > > <body> > > String user = (String) session.getAttribute("user"); > if( user == null) { > <jsp:forward page="WEB-INF/gatherer.jsp"> > <jsp aram name="doWhat" value="getName" />> </jsp:forward> > } > else { > out.println( "Hello there, " + user + ". Nice to meet you."); > } > Where are the JSP scriptlet tags. I assume you have them but did not post here. If not, add them. > > </body> > </html> > > > > Now gatherer.jsp which is in WEB-INF subdirectory: > > <jsp:directive.page > errorPage="/WEB-INF/errorPage.jsp" /> > > > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> > > <html> > <body> > > <% > String actionCode = request.getParameter( "doWhat"); > session.setAttribute( "user", new String("Fred Flintstone")); > out.println( "The action requested was : " + actionCode + ". Heck > yeah."); > %> > > <p>Go back to <a href="welcome.jsp">welcome page</a></p> > </body> > </html> > > > Not really an endless loop if the value is being assigned properly. Any diagnostic messages, any logs that are not being printed ? Post them here. Also, no need to keep the gatherer in Webinf folder. take it out.. keep it in your webapps/myproject/ folder. Assuming that you are using tomcat. |
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