Intellij 2021.2.4 javac2 Maven

There is no Maven plugin for javac2 specifically. But you can see possible solutions in a corresponding request: https://youtrack.jetbrains.com/issue/IDEABKL-6689/javac2-for-maven 

There is also an Ant task for javac2. So you can consider calling an Ant task from the Maven or call it directly from Ant.