Messages with level Diagnostic.Kind.NOTE (and others) on Annotation Processors
Apparently, this is a bug in maven-compiler-plugin that has not been fixed: MCOMPILER-66 - Compiler swallows messages from annotation processors.
Try to add following lines:
<configuration>
<showWarnings>true</showWarnings>
</configuration>
into the maven compiler-plugin definition in the pom.xml of the project. This solution works for me.
See: https://gist.github.com/esamson/0777b97adde4c2f9bc31