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A comment about the JAR file naming. [Apache Maven|http://maven.apache.org/maven2] has (amongst lots of other features) a "repository of artifacts" consept. They give each artifact a groupId, a artifactId and a version when installing it into the repository.
An artifact can be anything produced from a build, eg a JAR, a WAR, source bundle for IDEs. The main repository is at Ibiblio: http://www.ibiblio.org/maven2. This repository currently contains over 9000 artifacts, 7025 JAR files.
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