String templates and constant expressions

[Jens Lideström]

Dear experts and observers,

A recent message in the thread "Revisit the String template syntax" compared the Spring property annotation syntax with the proposed String template syntax.

@Value("${myproperty}")
private String myproperty;

I have the somewhat vague question: Are there any relation between the use case of these property annotations and the use case of string templates?

The argument of the @Value annotation must be a String constant expression.

Can a string template be used as a constant expression? Maybe if all its arguments are themselves are constants? Could a property syntax such as Spring's use string templates?

Could code like the following do anything sensible?:

@Value("\{someTemplateArg}")
private String someField;

Maybe like this:

@Value("\{MyProperties.SOME_PROPERTY_KEY}")
private String someField;

Maybe there is no relation and the answer is simply "no". But maybe it worth to think about.

I don't see constant expressions mentioned in the JEP: https://openjdk.org/jeps/430

Regards,
Jens Lideström

PS: This feature in general seems very good to me.