How to inject system property into static bean in configuration?

Question

In my Spring @Configuration class I wish to inject the system property ${brand} into a static String bean called brandString. I have succeeded doing that with the workaround described here https://stackoverflow.com/a/19622075/1019830 using @PostConstruct and assigning the static field an instance field value injected through @Value:

@Configuration
public class AppConfig {

  @Value("${brand}")
  private String brand;
  private static String brandString;

  @PostConstruct
  public void init() {
    brandString = brand;
  }

  @Bean
  public static String brandString() {
    return brandString;
  }

  // public static PropertyPlaceHolderConfigurer propertyPlaceHolderConfigurer() {...}

Is there another way of statically inject the value of ${brand} into the brandString field, without the workaround using another "copy" brand and a @PostConstruct method?

Answer 1

Try this:

@Configuration
public class AppConfig {

    private static String brand;

    @Value("${brand}")
    public void setBrand(String brand) {
        AppConfig.brand = brand;
    }

    @Bean
    public static String brandString() {
        return brand;
    }
...
}