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Before the Portlet 2 specification (JSR286), the recommended method for adding AJAX functionality to a JSR168 portlet was to deploy an additional servlet to the portal server (either inside the same WAR as your portlet(s) or in a stand-alone WAR) to handle asynchronous requests. Requests to these servlets are then handled by the servlet container as opposed to being routed through the portlet container, so they don’t automatically inherit the security context from the portal, as your portlets would.
