setParameter() and setPageParameter()

[hubaghdadi]

Hi.
What is the difference between setParameter() and setPageParameter()?
I was writing an integration test for a page that accepts a page parameter and page action method.
To set the parameter, I used setParameter(), it works but when swapped it for setPageParameter() it doesn't.
When to use each method?
Thanks.

[pmuir]

setParameter sets a request parameter for the mock request, setPageParameter sets a page parameter (i.e. one that already exists). Use setParameter unless you have a reason not to.

[hubaghdadi]

I have something like:

<pages>
 <page view-id="/hello.jsp" action="#{helloWorld.sayHello}">
 <param name="firstName" value="#{helloWorld.firstName}"/>
 <param name="lastName" value="#{helloWorld.lastName}"/>
 </page>
</pages>

In this case, firstName and lastName are page parameters or request parameters? and why?
Sorry, but I didn't get what is the difference.