If you have Servlet Filter Hooks ready to be upgraded, this tutorial’s for you. The process is quite simple:
Adapt your plugin to Liferay Portal CE 7.0’s API using Liferay IDE’s Code Upgrade Tool.
Deploy the plugin.
Liferay Portal’s Plugin Compatibility Layer converts the plugin WAR to a Web Application Bundle (WAB) and installs it to Liferay’s OSGi Runtime.
Your Servlet Filter is running on Liferay Portal CE 7.0!