The following file has an incorrect header format:

open/test/jdk/sun/security/x509/X509CertImpl/CertificateValidation.java

   * Copyright (c) 2020 Oracle and/or its affiliates. All rights reserved.

The year, YEAR should be "2020,"

You can verify the header is correct with make/scripts/lic_check.sh to make sure each file now passes.

The template is located at:
  make/templates/gpl-header
  make/templates/gpl-cp-header