Beginner JSP / Forms question

Hello,
I'm just starting with jsps and I've got a pretty simple question. In my jsp I generate a form with two fields: age and weight. I'm wondering what the best method is for handling the users response. Two specific questions: (1) I'm currently handling the response in the same jsp which generates the form. Is this bad, uh, form? (2) To differentiate between the 'initial' request and the request resulting from the users form submission I'm arbitrarily checking whether the value of the 'age' parameter is null. Is there a better way to do that? Thanks in advance for any thoughts on these issues.
-exits

Yeah, that is fine for early JSPs (on both questions).
A couple of thoughts:
1) What if the user submits a weight but not an age? You should probably check if either of the two inputs are null.
2) This design is fine for smaller applications (it is called the Model 1 application design). For more complex applications, using Model 2 (Model - View - Controller or MVC) pattern is much better.
Basically you use a combination of Servlets and JSPs. One servlet is the target of all your links and forms - this is the Controller. Based on parameters and other conditions, the controller determines where the page should go next, and accesses the business logic (other classes that get/store data or calculates results. These other classes are the Model) , and passes this information to the the JSP needed to display that information (the View).
This helps JSPs stay small and manageable, since adding to much logic in a JSP means writing scriptlets, which become tough to maintain later on. It takes more work up front, but for larger apps and over longer periods of time (when it becomes time to update the look, or fix bugs) it makes a lot of sense.

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Regards

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http://download.oracle.com/docs/cd/B25284_01/current/acrobat/115devg.pdf
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RequestDispatcher dispatcher = request.getRequestDispatcher("jsp/myjsp.jsp");
dispatcher.forward(request, response);
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if there is a way what do they call that method?

hi,
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%>
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%>
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Edited by: Reddy_Prasad on ?? ?????, ???? ?:?? ???????
Edited by: Reddy_Prasad on ?? ?????, ???? ?:?? ???????

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Hello everyone out there'
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<%@page pageEncoding="UTF-8"%>
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<center ><form method="POST" action="/Apps/Japp/TEST.jsp" >
<table bgcolor='navyblue'>
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<tr><td><font Color="yellow" size="5"><b>Subject :</b> </font></td>
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<textarea name= "comment" rows="8" cols=50/></textarea>>
<input type="submit" value="Submit your Entries" />
<input type="reset" value="Clear Entries" /></form>
</center >
<hr/>
<%
Connection conn;
Statement stat;
String studentNumber = request.getParameter( "num");
String firstName= request.getParameter(" fname");
String middleName= request.getParameter("mname" );
String lastName = request.getParameter( "lname") ;
String subject= request.getParameter( "sub") ;
String grade= request.getParameter("grade") ;
String numInGroup= request.getParameter("ngroup") ;
String coment = request.getParameter("comment" ) ;
String examType= request.getParameter("etype" ) ;
try
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stat = conn.createStatement();
stat.executeUpdate( "INSERT INTO REPORT " +
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"subject,grade,numInGroup,coment,examType" );
stat.close();
conn.close();
catch (Exception e)
e.printStackTrace();
%>
</body>
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HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /Japp/TEST.jsp(6,1) Illegal value of scope attribute: PAGE (must be one of "page", "request", "session", or "application")
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     javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
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note The full stack trace of the root cause is available in the Tomcat logs.
Apache Tomcat/5.0.19

org.apache.jasper.JasperException: /Japp/TEST.jsp(6,1)
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Keep in mind that JSP is Java, and Java is case sensitive. Re-read the error message and see if you can't locate and fix the problem.
PS: This occurs because you are writing code without following any sort of coding standards. It makes for errors in JSPs, but also real hard to read HTML. Create a set of rules for yourself and follow them. It will make it a lot easier to manage later on. Some example rules:
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Master-Detail Form Questions

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