title: Mutable fields should not be "public static"
body: <p>I getting sonarQube error of below line, any suggestion experts how to resolve this? Thanks in advance </p>
  
  <pre><code>    protected static final String [] COLUMN_NAMES = new String[]{"date","customerNumber","customerName",
              "account","emailAdress","mobilePhoneNumber","emailStatus"};
  </code></pre>