SCJP 4 You

The implicit objects available in the expression language are as follows:

Object	Description
applicationScope	It maps application-scoped variable names to their values.
cookie	It maps a cookie name to a single cookie object.
header	It maps HTTP request headers as strings.
headerValues	It maps HTTP request headers as an array of strings.
initParam	It maps a context initialization parameter name to a single value.
pageContext	It provides access to objects of servletContext, session, request, and response.
pageScope	It maps page-scoped variable names to their values.
param	It maps a request parameter name to a single value.
paramValues	It maps a request parameter name to an array of values.
requestScope	It maps request-scoped variable names to their values.
sessionScope	It maps response-scoped variable names to their values.

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