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Standards #

• Portlet 1.0 (JSR-168)
• JCP web page for JSR-186
• Portlet 1.0 Specification download page
• Errata page for JSR-168

• Portlet 2.0 (JSR-286): currently under development, Liferay is member of the Expert Group defining it:
• JCP web page for JSR-286
• Portlet 2.0 Early Draft 1

• Wikipedia page for Java Portlet Specification

Official documentation #

Here are direct links to the sections of Liferay's official documentation that deal with portlet development:

• PPT presentations on basic installation, development env. setup, JSP Portlets and Struts Portlets This is a good starting point
• Hot deploy portlet applications in Liferay
• Writting a simple JSPPortlet

It is also recommended that you check the example portlets when developing your own portlets for Liferay:

• Liferay Samples

External resources #

Articles #

• Introduction to JSR 168 - The Portlet Specification
• Best Practices for Applying AJAX to JSR 168 Portlets

Blogs #

• JSR 168, WSRP, Portlets & Enterprise Portal

Books #

• Portlets and Apache Portals Free online 500 page book written by one of the original authors of JSR-168. It uses Apache Jetspeed and Pluto for code samples, but has great depth. Free registration is required for download.

Tools #

• Portlet bridges: Allow using regular web development frameworks such as Struts or JSF when developing portlets.

Wikis #

• JA-SIG Portlet Development Wiki