javac has an option to suppress warnings but no equivalent option to suppress notes. Most compilers these days have the ability to "run quiet" and not generate any output in the case of a successful compilation.

Notes are used (amongst other uses) for notification of unchecked and deprecation warnings, so they should not trivially be suppressed. They should not be suppressed on the compiler API (JSR 199), but it would be worth having a hidden option that is effectively equivalent to the host system filtering out these messages with grep or similar.