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

user_243164 0
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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't work out how to do it. Any clues?

maven-2
4 Answers

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:

  <dependencies>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-jdk14</artifactId>
      <version>1.6.1</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-nop</artifactId>
      <version>1.6.0</version>
    </dependency>
  </dependencies>

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
Motlin_235720
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