Maven build [WARNING] we have a duplicate class

Question

Anybody has any idea what happened to my maven build? I am getting a lot of duplicate warnings.

[WARNING] We have a duplicate org/apache/commons/logging/impl         


        

Answer 1

In my case I was relying on a package that also creates a shaded jar.

Shaded jars are meant for deployment, not installing as a dependency.

Creating a reduced dependency POM during the build process of the dependency, instructs maven on which dependencies can be left out.

In the maven-shade-plugin configuration:

  false

For more details see this post:

What is the maven-shade-plugin used for, and why would you want to relocate java packages?

The error I was getting from maven:

WARNING: x.jar, y.jar contain overlapping classes