I am having problems with this section of code...
public void updateRank(){
int x = -1;
int y = -1;

request.getRequestDispatcher(url).forward(request,response);
will forward the POST request from previous page to the next page, but
they are on the same window.
I want to forward the POST request to a new window:

I'm having some trouble with the static void main concept in stand
alone java applications.
Here is an example to explain my problem.
-------------8<---------------

Can anyone help a newbie who keeps getting this error?  Thanks in advance.
java.lang.RuntimeException: java.util.ConcurrentModificationException:
ConstraintIterator failed due to the underlying model changing.
at

from servlet API:
getInitParameter(String) - Method in class javax.servlet.GenericServlet
    Returns a String containing the value of the named initialization
parameter, or null if the parameter does not exist.

  I am trying to learn Enterprise programming and is trying to
compile a small program.  I have downloaded the J2EESDK from the Sun
site.  I am trying to compile the program, but the error mentioned
above is being reported.

A basic question??
What is the fundamental difference between Servlet ,JSP and Java
Beans. me Just a begineer,so basic functionality anwer will work fine
for me, to understand and start learing from there.

I am working on a java web application and have the need to preserve a
URL that throws a 404 error.  I have the following entered into my
web.xml:
<error-page>

Can I get a clear summary of the rules involved with these ?
forward,  include,  RequestDispatcher rd
<jsp:include page="servlet/MyServlet" flush="false" />
rd.forward(req, res);

Hello, i want to write a program with the following data:
A wine farmer sells wine to customers who visit the farm. Suppose that the
daily demand d in liters as function of the price p in guilders per liter is
given by:

error:
C:\java>java -jar HelloWorldApp.jar
Failed to load Main-Class manifest attribute from HelloWorldApp.jar
contents:

I'm just beginning with Java. Can you help? Is there something I can
do to make it impossible for the user to mess around with the order of
the columns. It's just that I find it annoying that the columns can be
moved when there's absolutely no use for it!

I have sorted out all my stupid errors with this code, except for one.
I am getting the error "cannot resolve symbol variable
TextInputPrompt", and can't figure out why. As far as I can see, I
have imported the java.io.* classes and spelled the name correctly.

   Is it REALLY impossible to pass java sockets to external programs in
any way?  Is there no socket handle, as in c?  If anyone knows of a way
to do this in java, or can confirm that it is absolutely impossible, it
would be a ton of help.  Thanks

I'm sure this is a silly question but I'm having problems with declaring an
object inside a conditional statement. The compiler complains that it cannot
resolve the variable I have assigned to the object.
To try and figure out why I wrote the following (totally useless) code: