A maven plugin to find and flag duplicate classes and resources on the java classpath.

This ensures stability and reproducability of a maven build and will flag possible problems or conflicts with dependencies in a project.

This plugin is a friendly fork (same main authors) of the Ning maven-duplicate-finder plugin. It is configuration compatible to the ning plugin; the only change required is the group and artifact id of the plugin itself.

The plugins requires Apache Maven 3.x.x.

Starting with release 1.2.0, Java 7 or better is required.

Starting with release 1.3.0, Java 8 or better is required.

Starting with release 1.5.0, Java 8 or better is required to run the plugin and Java 9 or better (Java 11 strongly recommended) is required to build the plugin.

The plugin has two goals:

• duplicate-finder:check - the main goal of the plugin. Runs duplicate check on the maven classpaths.
• duplicate-finder:help - displays standard maven plugin help information.

Up-to-date documentation is available from the documentation site.

See the Changelog.

• Thomas Dudziak (@tomdz)
• Henning Schmiedehausen (@hgschmie)

• Andrew Gaul (@andrewgaul)
• Davy De Waele (@ddewaele)
• Conny Kreyßel (@kreyssel)
• Matt Stephenson (@mattstep)
• Mickaël Tricot (@mickaeltr)
• Steven Schlansker (@stevenschlansker)
• Tim Williamson (@twilliamson)
• @camshoff
• @jakub-bochenski
• Michael Bellomo (@mbellomo)
• Frank Jakop (fjakop)
• Brian Clozel (@bclozel)