I try to build onedev from source, I have: openjdk 11.0.2 2019-01-15 Apache Maven 3.8.5

[ERROR] Failed to execute goal io.onedev:plugin-maven:2.7.0:generate-resources (generate-resources) on project server: Execution generate-resources of goal io.onedev:plugin-maven:2.7.0:generate-resources failed: Unable to load the mojo 'generate-resources' in the plugin 'io.onedev:plugin-maven:2.7.0' due to an API incompatibility: org.codehaus.plexus.component.repository.exception.ComponentLookupException: io/onedev/plugin/maven/GenerateResourcesMojo has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 55.0

something there's not right, java 8? or lower??