Naming convention for properties in property file

Question

What are the naming conventions for property names defined in properties files in Java? Can I use uppercase or only lowercase?

For example: bankAccountNumber or bank.acc

Answer 1

There's no particular standard for naming properties, but convention appears to be of the form

a.b.c.d = x

in lowercase. I would expect some sort of informal hierarchy e.g.

bank.
bank.account.
bank.account.name.
bank.account.pin.

etc.

If it's a property which directly affects a particular class I may name it after that class (or at least use the package name). However that is also an example of implementation leak, and I'd think seriously before doing that.