Maven enforce no duplicate dependencies even of same version - maven

Question

We can use the maven-enforcer-plugin to prevent duplicate dependencies with difference versions.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<id>no-duplicate-dependencies</id>
<goals>
<goal>enforce</goal>
</goals>
<configuration>
<rules>
<banDuplicatePomDependencyVersions/>
</rules>
</configuration>
</execution>
</executions>
</plugin>
What about for duplicate dependency declarations of the same version?
Consider that we are building a multi-module project.
Say we start with project Foo.
Foo pom.xml
<dependencies>
<dependency>
<groupId>someGroup</groupId>
<artifactId>someArtifact</artifactId>
<version>1.0.0</version>
</dependency>
</dependencies>
Later, we introduce the module Bar, which also depends on the same version someArtifact.
Bar pom.xml:
<dependencies>
<dependency>
<groupId>someGroup</groupId>
<artifactId>someArtifact</artifactId>
<version>1.0.0</version>
</dependency>
</dependencies>
And Foo depends on Bar, so we update the POM.
Foo pom.xml
<dependencies>
<dependency>
<groupId>myGroup</groupId>
<artifactId>bar</artifactId>
<version>1.0.0</version>
</dependency>
<dependency>
<groupId>someGroup</groupId>
<artifactId>someArtifact</artifactId>
<version>1.0.0</version>
</dependency>
</dependencies>
As in the above example, and as our projects grow, we may forget that the same version of dependencies are already transitive dependencies.
In my mind, for organization sake, I find it messy to leave these duplicate declarations, such as it is with someArtifact.
I could write a new maven-enforcer-plugin rule, but maybe there is already a solution.

Answer 1

Try with dependencyConvergence rule. Add this to your parent pom.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>3.0.0-M3</version>
<executions>
<execution>
<id>enforce</id>
<configuration>
<rules>
<dependencyConvergence/>
</rules>
</configuration>
<goals>
<goal>enforce</goal>
</goals>
</execution>
</executions>
</plugin>
Reference :: https://maven.apache.org/enforcer/enforcer-rules/dependencyConvergence.html