J2ee: need another pair of eyes.

DaLoverhino · Nov 22, 2005

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.

HalcyonWild · Nov 22, 2005

DaLoverhino said:
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">
<jsparam 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.

Help with j2ee beginner's question.	1	Jun 23, 2006
Learning J2ee, got newbie question.	3	Feb 21, 2006
j2ee newbie questions: resource not available.	2	Feb 1, 2006
Use link to forward Session entries instead of Request Dispatcher	2	Sep 13, 2007
Struts Tiles Error	0	Oct 28, 2009
custom tag in jsp	1	Jan 7, 2009
jsp:getProperty question	5	Oct 28, 2009
JSTL forEach	7	Mar 26, 2007

J2ee: need another pair of eyes.

DaLoverhino

HalcyonWild

Ask a Question

Similar Threads

Members online

Forum statistics

Latest Threads