If a comment is out of date spend a few seconds to update or remove it.  Don't leave it there to confuse the next person.

// The integer ID of the customer
// Initially set to -1 to show it has not yet been loaded with data
String customerId = null;

Update it before it confuses the next person who takes comments at face value:

// The String ID of the customer
// When null it means “not yet loaded with data”
String customerId = null;
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