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mavenmaven-3multi-module

Get version of specific module in multi module maven project

I have a multiple maven module project. I need to retrieve a module's current version.

Parent Pom (2.4.0)
|- module1 1.5.0
|- module2 1.3.4
|- module3 1.2.5

Get version of module2 would return 1.3.4.

FYI: module1 maybe a dependency of module2.

Found one way of doing it was

mvn depedency:tree -X |  awk '/module1/ {split($0, a, ":"); if (a[4]) {print a[4]; exit}}'

Would prefer a cleaner way of doing it.

Solution

  • There are a couple of solution, but they're all based on the same logic:

    mvn -f model2 org.apache.maven.plugins:maven-help-plugin:3.2.0:evaluate -Dexpression=project.version -q -DforceStdout

    With -f model2 or -f model2/pom.xml you specify the path to the pom.xml

    With org.apache.maven.plugins:maven-help-plugin:3.2.0:evaluate you call the evaluate goal of the maven-help-plugin. If the pom already has a locked version on this plugin, you can simply use help:evaluate

    With -Dexpression=project.version you specify what you want to know. In case it starts with project, you're following the xml structure of the pom.

    With -q you suppress the output logging as handled by the logging framework of Maven.

    But that would also suppress the result of the evaluate goal too. Hence by using -DforceStdout the result will be visible, because it bypasses the logging framework.