if i have understood your que properly,
when you get abc.jsp, check if there is a parameter called "id"(or whatever
you expect),
if yes
{
check its value, if the value is what you expect{
display success page...
}
else{
send user to error page with response.sendRedirect feature (don't
forget return statement
after sendRedirect)
}
}
else{
String parameter = "id=123"; //forcefully assign value what you want and
then proceed
String newPage = "abc.jsp?"+parameter;
response.sendRedirect(newPage);
return;
}
----------------------------------------
This way you won't get NullPointerException...Either you get success page or
error page..
hope this helps..
Nishit
-----Original Message-----
From: Venkata Ratnam Vadlamannati [mailto:[EMAIL PROTECTED]]
Sent: Friday, February 23, 2001 8:31 AM
To: [EMAIL PROTECTED]
Subject:
Hi All
When we more than one querystring in JSP, how do we
read then in the next page, because if we use
request.getQueryString(), it returns the whole string
after '?'
and if we use request.getParameter("parameterName"),
it works fine, but when requests come from different
pages and they do not contain this parameter, it
throws nullpointer exception.
In detail:
abc.jsp?id=123, in abc.jsp we can read id by using
request.getParameter("id"), but if a request comes
from another page, say, xyz.jsp to abc.jsp without any
parameter, abc.jsp throws expection
Is there any better way of dealing with these
querystrings/parameters. any examples/links are
highly appreciated
Regards
Mahesh
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