Should I create private static final String = "Some exception message" or leave it inside the code?

Question

Should I create private static final String = "Some exception message" or leave it inside the code? Is there any performance issues? I have a lot of exception cases. Texts are mostly different in any particular case. Wary about performance and memory issues. Internationalization is quite possible in future recs.

Answer 1

No difference from performance point of view.

So, for the sake of readability, and in case you don't use the same string elsewhere - leave it inside the code.

As for internationalization - I'm opposed to the idea of i18n exceptions, but if you do so:

• construct the exception with a message key (from a class with static final message keys).
• resolve the corresponding message only when the exception needs to be displayed.

Answer 2

An exception to the answers from Bozho and Thilo, IMO, is when you ARE using an exception message in more than one place. If you're going to move one message to a static final string, do so for all exceptions within that file for consistency. If one finds one exception message at the top of a file, logic would suggest that all of them might be found there.