[SOLVED] On which level of the maven dependency tree are dependencies from the parent project

On which level of the maven dependency tree are dependencies from the parent project

I have a parent pom which has a dependency to third party jar A with version 1.0. Then I have a child project which inherits from the parent pom. This child project defines a dependency to library B which itself has the dependency to the third party jar A with version 1.1.

Does the dependency tree look like this(and therefore version 1.0 is pulled in):

Child->A(version 1.0) Child->B->A(version 1.1)

On which level of the dependency tree are the dependencies of the parent POM?

Solution

Before dependencies are resolved, the parent and child POM are first combined into an "effective POM". You can display the effective POM using mvnhelp:effective-pom. Hence your dependency tree becomes:

  (Effective POM) -> A:1.0
  (Effective POM) -> B     -> A:1.1

The effect is the same as if you had declared the A:1.0 dependency in the child POM. Since dependencies closer to the root "win" in Maven, A:1.0 is used.

Also, if both the parent and child POM declare a dependency to the same module, the version specified by the child overrides the one specified by the parent (= becomes the version in the effective POM).