Contains interfaces for the portal services. Interfaces are only loaded by the global class loader and are shared by all plugins.
Contains implementation for the portal services.
Contains tag libraries. Classes are loaded separately for each plugin.
Liferay Portal Upgrade
Liferay Portal Configuration Metatype
Contains useful utilities. Classes are loaded separately for each plugin.
Apache Portals Bridges Common Utilities and Interfaces
The Java Portlet API version 2.0 developed by the Java Community Process JSR-286 Expert Group.