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If you want to apply a pluginManagement configuration for a plugin that is already applied, for example maven-compiler-plugin, the section is imported but it is not applied.

For example, if you put this configuration if your mixin:

  <build>
      <pluginManagement>
          <plugins>
              <plugin>
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-compiler-plugin</artifactId>
                  <version>3.11.0</version>
              </plugin>
          </plugins>
      </pluginManagement>
  </build>

And you import it via the mixin-maven-plugin, the pluginManagement section is correctly imported, but the version of the applied maven-compiler-plugin is still 3.1, as you can see from the build of the user project and in the effective pom.

Attached you can see two project:

• mixin-bug: the mixin that will be imported
• mixin-user-bug: the project that uses the mixin.

Build mixin-bug first, then mixin-user-bug and see the fact that maven-compiler 3.1 (not 3.11.0) is used. Generate the effective pom to have a confirmation of it.
mixin-bug-demo.zip