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# Posts

This post is part of a multipart series about creating a graph off all available Maven dependencies.
In the article for the Neo4j extension I described the input for the extension. This article describes the model that is used to create the required JSon. I start of with a small introduction to Vertices and edges before going into the implementation.
Vertices and Edges In mathematics, and more specifically in graph theory, a vertex (plural vertices) or node is the fundamental unit of which graphs are formed: an undirected graph consists of a set of vertices and a set of edges (unordered pairs of vertices), while a directed graph consists of a set of vertices and a set of arcs (ordered pairs of vertices). This post is part of a multipart series about creating a graph off all available Maven dependencies.
This article describes the drivers behind and the implementation of the Unmanaged Neo4j Extension written for our Maven graph analysis.
When a the processing cluster is sending the sub graphs that need to be merged into a single database locking issues will occur. We opted to use a queuing mechanism to prevent. From the choices we had to implement this as a component for the Neo4J server we choose to this as a unmanaged extension.