This is the title of an issue reported for the Maven plugin[1]
Based on the analysis some involved developers came to the conclusion that the outputFileEncoding for Java 9, 10 and 11 was changed to UTF-8, but since Java 12 it behaves again like Java 8.
Can this be confirmed with the related ticket or are we facing a different issue?
regards, Robert Scholte [1] https://issues.apache.org/jira/browse/MJAVADOC-614