spring - @Value annotation not working in constructor

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Top 4 Answer for spring - @Value annotation not working in constructor

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92

As far I remember, the value injection occurs after the constructor call.

Try to change your constructor to this:

public Email(@Value("${TO_EMAIL}") String toEmail) {     this.toEmail = toEmail; } 
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86

I encountered similar problems when I work with ApplicationRunner

public class AppStartupRunner implements ApplicationRunner {     @Autowired     private Environment myEnv; //not work      @value(${xxx.xxx})      private String myValue //not work      @Autowired     public AppStartupRunner(Environment env) {       System.out.println(myEnv); //null       System.out.println(myValue); //null     } } 

After I changed to the below codes, it works perfectly

  @Autowired   public AppStartupRunner(Environment env) {       env.getProperty("key") //works!   } 
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71

The value injection occures after the constructor call, to solve this in your case, you can leave the constructor empty. And add a method annotated with "@PostConstructor". This way, the empty constructor will be called, then the values will be injected, then the @PostConstructor method will be called.

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69

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