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Understanding the Java Portlet Specification
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Understanding the Java Portlet
In recent years, many organizations have implemented an enterprise portal to
host internal and external applications. There are numerous J2EE portal vendоrs
offering products in this lucrative market. In the past, each of these portal
offerings defined their own proprietary APIs for building portlets, application
components that run inside portals. Unfortunately, coding to these various APIs
translated into vendor lock-in for portlet developers. The Java Portlet
Specification (JSR 168) changes this.
This specification, developed by a committee of J2EE portal vendors, aims to
achieve interoperability between portals and portlets. Vendors prove compliancy
by passing a series of tests defined in Sun Microsystems' Technology
Compatibility Kit, or TCK. This standardization will help to simplify portlet
development and enable developers to create pluggable components that run on any
compliant, J2EE portal server.
This article begins with high-level definitions of portals, portlets, and
portlet containers. Following that, we will highlight the most important aspects
of the Java Portlet Specification. Later this month, a follow-up article will
demonstrate how to develop a portlet from scratch, reinforcing the concepts
Portals, Portlets, and Portlet Containers
There are three logical components to consider when developing to the Java
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