Constants or properties file - best practice question

Hi,
My application has a number of values that will be used in different classes throughout my project. For example, I perform a check against the max allowed length of an ID in numerous places in my code.
Therefore, it makes sense to set this value in a central location, and refer to it as a variable where it is required in my code.
I see in other projects that using a public static final member in a Constants class is used to set these types of values. Is this recommended or best practice?
The only alternative I can think of would be to use a properties file, and inject the value using Spring etc.
What is considered best practice or the neatest way for doing this?
Thanks

user10340197 wrote:
Thanks. I'm using Spring anyways, so it would provide me with the PropertyPlaceHolderConfigurer for injecting these.And the name of that class provides a clue. As Kayaman said, constants are constants. Math.PI does not and will not change, EVER. Neither will Integer.MAX_VALUE.
Configuration parameters, on the other hand, might change. If your MAX_ID_LENGTH is ever likely to change, and could do so without causing widespread chaos, then it probably should be a property (ie, a configuration) value.
If not, it should probably be a constant (with appropriate 60-point documentation warning people what might happen if they DO change it).
Winston
PS: There is nothing particularly terrible about having a Properties class (except that you'll want to call it something different) that initializes its values from configuration files; except that if there are gazillions of them, you might want to:
(a) Split them up into "themes".
(b) Re-think your design.
Winston

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Brother wrote:
I probably should have posed this question here before I delved into writing Java to get data for reports, but better late than never.
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