Runs when the portlet is first initialized, on a per-user basis. This initializes
information that is needed on future rendering of this portlet. This is called only
on the first time that the portlet is rendered on a user's login. The information
stored here should be only that which is expected to persist across the growth of
information in the portlet, such as the success and failure paths for the portlet.
Parameters:
initProperties - The properties to get information from, such as
initProperties.getProperty("display-page") and
initProperties.getProperty("empty-page")
context - where to store information, such as
context.setAttribute("display-page", initProperties.getProperty("display-page"))
