CODEWITHSUNDEEP
jspservletsel
Vitalii Vitrenko
Vitalii Vitrenko

Reputation: 10395

Type of pageContext.request

I found this answer very usefull but I can't figure out why it works.
In accordance with API pageContext getRequest() method returns ServletRequest and it doesn't contain getUserPrincipal() method. So why do things like this work

<c:if test="${not empty pageContext.request.userPrincipal}">

    <c:if test="${pageContext.request.isUserInRole('ADMIN')}">

        User ${pageContext.request.userPrincipal.name} in ADMIN Group

    </c:if>

</c:if>

Is there implicit type conversion or what?

Upvotes: 1

Views: 872

Answers (1)

JB Nizet
JB Nizet

Reputation: 691745

The servlet API has been designed, a long time ago, in order to be usable in a context that is different from a web, HTTP context (I think supporting WAP using this API was a goal, at that time).

In reality, I don't know of any context other that the traditional Java EE webapp context where the servlet API is used. And in that context, all requests are instances of HttpServletRequest (which is a sub-interface of ServletRequest). And this method exists in HttpServletRequest.

Upvotes: 3

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