How do I get Maven to fail when conflicting versions of the same artifact are referenced?

Question

I\'d like my Maven build to fail if the same artifact is referenced with different versions in my dependency tree. This would seem like a fairly trivial option, but I can\'

Answer 1

The maven-enforcer-plugin has a dependencyConvergence rule which does what you want. Here's an example from the documentation.

This will cause a build to fail:

  
    
      org.slf4j
      slf4j-jdk14
      1.6.1
    
    
      org.slf4j
      slf4j-nop
      1.6.0
    
    

With this being logged during compilation:

[ERROR]
Dependency convergence error for org.slf4j:slf4j-api:1.6.1 paths to dependency are:
+-org.myorg:my-project:1.0.0-SNAPSHOT
  +-org.slf4j:slf4j-jdk14:1.6.1
    +-org.slf4j:slf4j-api:1.6.1
and
+-org.myorg:my-project:1.0.0-SNAPSHOT
  +-org.slf4j:slf4j-nop:1.6.0
    +-org.slf4j:slf4j-api:1.6.0