Intended audience. This document is intended for developers that want to develop portlets that will be deployed in Liferay Portal. As Liferay supports the portlet specification (JSR-168), any portlet developed according to that standard will work.

Liferay version. This guide has been written for Liferay 4. Some details might be different for previous versions. Do not expect it to be accurate for even older versions.

Related documents. If this is not what you are looking for consider the following related documents

More information and support. If you are looking for help for a specific issue we invite you to use our community forums: http://www.liferay.com/web/guest/devzone/forums to ask your questions. We also offer professional support services (support@liferay.com) where your company will be assigned a Liferay developer ensuring your questions are answered promptly so that your project is never compromised. Purchased support always gets first priority. This business model allows us to build a company that can contribute a great portal to the open source community. If your company uses Liferay, please consider purchasing support. Liferay has an extremely liberal license model (MIT, very similar to Apache and BSD), which means you can rebundle Liferay, rename it, and sell it under your name. We believe free means you can do whatever you want with it. Our only source of revenue is from professional support and consulting.