Hi,
I am currently facing this error while building ovirt-engine master (commit da774d861d5a593666932f6e678f5383222ed8d5) on fedora 29. 

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project ovirt-checkstyle-extension: Fatal error compiling: invalid flag: --release -> [Help 1]

full build log here: https://pastebin.com/rJA5PHWu
--