SpringBoot 不解析没有 PropertySource 注释的 @Value 属性

Question

I have a bunch of @Value annotated fields in a SpringBoot configuration file, with the matching values in the standard application.properties . If I don't annotate the configuration file with @PropertySource("classpath:application.properties") it will just copy the "${prop1}" string into the actual variable.

I tried adding @EnableAutoConfiguration to the @Configuration class (instead of the PropertySource annotation), but all it does is to break when a requested property is not found.

SpringBoot is supposed to resolve the properties automatically from the standard application.properties file, why this behaviour? Using version 2.2.2.RELEASE

Update:

The answers are correct, the reason it was not working was that I was calling these properties in a test. Annotating the test with @SpringBootTest fixes the issue. In fact when the application is running it is @SpringBootApplication that does the magic

Answer 1

As you can read in this article (chapter 5) , SpringBoot manage automatically the application.properties file.

I don't know if this is your problem because I've not seen the code, but in Spring Boot the Application class should be annotated with @SpringBootApplication .

@SpringBootApplication
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

Take a look at this starting example .

---

You can then inject the value for example in a controller class in this way:

@RestController
public class HelloController {

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

    @RequestMapping("/test")
    String hello() {
        return test;
    }

}