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Dependency Graphing

We have a listener on the artifact resolver that can be used to track how the dependencies are resolved, which versions are used, and which are eliminated. Currently, only a simple textual representation is available at runtime. We want to be able to do some reporting based on this.

There will be several usage patterns for the resulting graphs.

  • Identifying dependency exclusions.
    Is it excluded, and where did exclusion originate.
  • Identifying dependency version decisions.
    If maven picks another version, which one, and why?
  • Identifying dependency owner.
    If dependency is present in project, how did it get there?
    By current project, by transitive dependency, or by parent pom concepts?
  • Identifying transitive dependency complexity.
    Multi module project is getting out of hand, what dependencies can i collapse safely into one dep?
  • Identify relocated dependencies.
    If a dependency was relocated, identify it.
  • Identify missing or bad dependencies.
    If dependency is not found, flag it.

How should we show the graph?

  • With nodes representing a unique groupId:artifactId and the edges representing the scope/version ?
  • With nodes representing a fully unique groupId:artifactId:version and the edges representing the scope?

What should be included?

  • Just the active dependencies?
  • The excluded dependencies, but flagged to indicate that they are excluded.
  • Optional dependencies.
  • All scopes? (indicate scope somehow. by color?)

Other Resources

Create A Graphviz plugin? (joakime volunteers for this)
Graphviz ( http://www.graphviz.org/ ) is an excellent package for creating graphs and graph images, but it is a native application. If this route is chosen, how do we handle graphviz? As a dependency, or as a configuration parameter to the pre-installed binary?

From Carlos:

From Jason:

From Wim:

They show how to convert an xml tree structure to a SVG image.

From Joakim:
Ambitusgraph: https://svn.sventech.com/repos/joakim/projects/trunk/ambitusgraph/

Currently an interactive dependency viewer experiment.
Example of current functionality.

 

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