"Apache Pluto is the reference implementation of the Java
Portlet Specification (JSR 168). Pluto provides the basic,
lightweight implementation of container interfaces specified in JSR
168 and a portal driver with other utilities for developing
standard portlets. Pluto serves as a basic portlet container that
implements the portlet APIs and offers developers a working example
platform from which they can host their portlets. Pluto's simple
portal component is built only on the portlet container's and JSR
"Apache Geronimo 1.1 is an open source Java 2 Platform,
Enterprise Edition (J2EE) 1.4-certified application server. Unlike
other J2EE application servers, Geronimo comes preintegrated with
external resource components, such as a database, a messaging
server, and a directory server..."
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