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

All above (about reviewing dependencies tree and excluding) is correct in the most of cases, but in my case (i didn't have overlapping in my dependencies) preliminary clean helped (don't know why though):

mvn clean package