I’m writing a quick Migration tool for JDK 11
Basically you insert eh directory of the sources and a list of modules/API will be produced, combined with other warnings/metrics for migrating to JDK 11.
The repository is here https://github.com/FranciscoMeloJr/migration_jdk
Update: MTA/Windup has some scripts for migrating from JDK 8 to JDK 11 now.