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Not able to get the last question  RSS feed

 
palmari sivasubramanian
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Posts: 6
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Hi all,
I am new to jsp. I have designed one program in jsp that it contains 5 questions. i did it using if loop. if i use jsp forward page, instead of displaying fifth question, it displays the forwarded page.
"quiz.jsp" is my page and if the last question comes, it has to go to the "handle.jsp" page. but i am not getting the last question. it displays the 4 th question and then to "handle.jsp"

here is my code..

<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<%!
int count=1;
Connection con=null;
Statement stmt=null;
ResultSet res=null;
%>
<html>
<body>
<form action="quiz.jsp">
<%
Object o=request.getAttribute("modern");
try
{
boolean ab=false;
if(count<=5)
{
class.forName();
...
...
<% if(count<5)
{
%>
<input type="submit" value="next">
<% } %>
<% if(count==5)
{
%>
<input type="submit" value="Submit">
<% ab=true;
} %>
<br></br>
<%
count++;
}
if(ab==true)
{
%>
<jsp:forward page="handle.jsp"/>
<% }
}
catch(Exception e)
{
System.out.println("Exception"+e);
}
%>
</form>
</body>
</html>
 
Ben Souther
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Posts: 13411
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palmari,
Welcome to JavaRanch!


In an effort to help you get the most from our forums, we've compiled a
list of tips for asking questions here. You can find the list in our
FAQ section here.
In particular, please see UseCodeTags.

You'll stand a much better chance of getting help if your code is easy to read.

As to your question:
I haven't gone through your logic completely so I can't tell you why you're not seeing the behaviour that you're expecting but I do see a much more serious problem.



Any variables declared inside the <%! ... %> block become instance variables. These variables are shared among all requests to your JSP (resulting in an app that is not thread safe).

This JSP may appear to be fine when you're the only one hitting it but it will show strange and erratic behaviour as soon as it starts handling multiple requests.
 
palmari sivasubramanian
Greenhorn
Posts: 6
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Hi Ben,

Thanks for your reply.
Give me some suggestions,how to handle this for multiple client requests.
which technology should i use?

Thanks in advance.
 
Ben Souther
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Posts: 13411
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At a bare minimum, move all of your variable declarations into one of the service methods (doPost, doGet, etc...).

This will insure that you don't accidentally introduce threading errors into your code.

As you progress, you should take a look at container managed connection pooling. All spec compliant containers offer this feature. With it, you can configure the container (Tomcat, Websphere, etc..) to manage your database connections. In your code, you just ask the container for a connection and and hand it back when you're done. It's much cleaner and allows you to leverage all the hard work that others have spent insuring that the connection pool doesn't cause threading errors or memory leaks.

http://tomcat.apache.org/tomcat-5.5-doc/jndi-datasource-examples-howto.html
 
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