J2ee: need another pair of eyes.

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DaLoverhino - 22 Nov 2005 10:20 GMT

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:param 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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HalcyonWild - 22 Nov 2005 19:48 GMT

> 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
[quoted text clipped - 5 lines]
>
> Anyways... here's the code (welcome.jsp, then gatherer.jsp):

Anyway, what exactly is the error, you did not mention.

> <jsp:directive.page />
>
[quoted text clipped - 16 lines]
> 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>
[quoted text clipped - 19 lines]
> </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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J2ee: need another pair of eyes.

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