neo4j
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Spring Data Neo4j enables POJO based development for the Graph Database Neo4j . It maps annotated entity classes to the Neo4j Graph Database with advanced mapping functionality. The template programming model is equivalent to well known Spring templates and builds the basis for interaction with the graph and is also used for the advanced repository support. Spring Data Neo4j is part of the Spring Data project which aims to provide convenient support for NoSQL databases. http://www.springsource.com/download/community?