Developer.com: Embedding Apache Pluto

"The Java Portlet Specification (originally created through JSR-168) provides a standard for developing portal components with the Java programming language. Although the specification was originally created with the intent of standardizing the API and execution environment of portals and portlets, developers are also leveraging the specification as a standard for developing Web application plugins. By implementing or embedding a portlet container within a Web application, developers allow their Web applications to be extended by third parties through the deployment of compliant portlets.

"Apache Pluto, the reference implementation of the Java Portlet Specification, implements a portlet container that can be embedded easily within a portal or Web application..."

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Developer.com: Developing Portlets with Apache Pluto(Oct 11, 2005)