https://stackoverflow.com/questions/53764748/mutable-fields-should-not-be-public-static
protected static List<String> COLUMN_NAMES = Collections.unmodifiableList(Arrays.asList("date","customerNumber","customerName",
"account","emailAdress","mobilePhoneNumber","emailStatus"));
标签:customerName,fields,should,static,Mutable,public
From: https://www.cnblogs.com/diyunpeng/p/16990793.html