I just added the Apache Rat plugin to the TinkerPop3 pom.xml. It detects whether or not the Apache License Headers are all where they need to be. You can run the rat tests by doing from the root of the repo:
mvn apache-rat:check which will generate a report in target/rat.txt of all the projects and their compliance. The command above, like many other useful maven commands, can be found in the README for future reference.
