This is a modified version of FAWE legacy to run in newer JVM versions.
You have to add this to your JVM arguments to make sure FAWE can modify non final fields
--add-opens java.base/java.lang.invoke=ALL-UNNAMED
[SUPPORTS JAVA 9+] Blazingly fast world manipulation for artists, large networks and developers: https://www.spigotmc.org/resources/13932/
JavaGPL-3.0