Request.getParameter() from same page as HTML form

I have a jsp page with a form. form contains a textfield, once the user submits the form, i want jsp scriptlet to get the
value of the user input and carry out processing on it within the same page and give a result.
problem is the first time the page is loaded, there is an error in the request.getParameter() statement since no form has
yet been submitted i guess ....
if i use another page ... it works ... but i want to display the information in the same page ...
thanks

I'd like to see an example where you'd get a NullPointerException from the line
if(request.getParameter("foo") == null)
but not one from
if(null == request.getParameter("foo"))
In either case, the only possibility for a NullPointerException would be if your request variable were null (but this would cause a NullPointerException in either method). Otherwise request.getParameter() returns a null value if the parameter does not exist, but will not throw a NullPointerException.

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Request.getParameter() from same page as HTML form

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