In the following example, you will notice that the dependency versions are added to each and every dependency defined in the application POM file:

<dependencies>
  <dependency>
    <groupId>com.nimbusds</groupId>
    <artifactId>nimbus-jose-jwt</artifactId>
    <version>2.26</version>
  </dependency>
  <dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.2</version>
  </dependency>
</dependencies>

Imagine that you have a set of application POM files in a multi-module Maven project that has the same set of dependencies. If you have duplicated the artifact version with each and every dependency, then to upgrade to the latest dependency, you need to update all the POM files, which could easily lead to a mess.

Not just that, if you have different versions of the same dependency used in different modules of the same...