java - The value for annotation attribute RequestMapping.value must be a constant expression

Question

When using the following code snippet:

public class MyUrls {

    // properties get initialized using static{...}
    public final static String URL_HOMEPAGE = properties.getProperty("app.homepage");    

}

@Controller
public class HomepageController {

    @RequestMapping(MyUrls.URL_HOMEPAGE)
    public String homepage() {
        return "/homepage/index";
    }

}

I get the following error:

The value for annotation attribute RequestMapping.value must be a constant expression

But in fact, URL_HOMEPAGE does be a constant, since it is declared as public final static. Am I wrong? How to solve this issue?

Answer 1

Whilst URL_HOMEPAGE is a constant it's value may not be, it can only be determined at runtime. I believe that values used in annotations must be resolvable at compile-time.