在 maven pom.xml 中更改传递依赖项的版本

Question

I've been trying to override a transitive dependency version in one of my projects. I found the following sample project on github to experiment on ( https://github.com/Richou/swagger-codegen-maven-plugin ). The parent pom of this project contains a dependency for swagger-codegen. Swagger-codegen in turn has a dependency called slf4j-ext whose version is 1.6.3. I want to upgrade/override the version of slf4j-ext to 1.7.30 from the parent pom. I tried adding the required slf4j-version inside the property tag in the parent pom but it didn't work when I checked the maven dependency tree. What is the correct method to do it?

        <dependency>
        <groupId>io.swagger</groupId>
        <artifactId>swagger-codegen</artifactId>
        <version>2.1.2</version>
    </dependency>
</dependencies>

<properties>
    <slf4j-version>1.7.30</slf4j-version>
    <java.version>1.7</java.version>
</properties>

Answer 1

You can add the slf4j-ext with the version you want in the dependencyManagement section of your parent pom.

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-ext</artifactId>
      <version>${slf4j-version}</version>
    </dependency>
  </dependencies>
</dependencyManagement>