hi , i am new to Spring webflow i am facing a problem in retrieving request parameter from a Jsp ..

Here is a form

<form method="post" action="pizza.html" >
<input type="hidden" name="_flowExecutionKey" value="${flowExecutionKey}" />
<b>PhoneNumber</b>
<input type="text" name="phoneNumber" />
<br>
<input type="submit" class="button" name="_eventId_submit" Value="submit" />
</form>

I am trying to retrieve the value of phoneNumber entered using

${requestParameters.phoneNumber} in another Jsp but its resulting in null value ...Please help