Reading values from application.properties Spring Boot

Question

My Spring boot app has this application structure:

• src
  • main
    • java
    • resources
      • application.properties
    <

Answer 1

As provided in the 2nd answer above I was indeed using the spring boot, so removed the static keyword and that resolved my issue. Make sure you don't have static for the property defined with @Value.

Answer 2

in my case, the same problem had a slightly different cause - i had a class with a static instance variable (the old usual way we used to implement a Singleton pattern), into which i wanted to inject an entry from application.properties (probably the "static" thing was why the property could not be found - with no errors no anything :/).

moreover this class was in a totally different package from the class declared as @SpringBootApplication. i understood that package names and locations have to be taken into serious consideration with Spring Boot and automatic component scanning. my 5 cent

Answer 3

Probably not the exact solution you're looking for, but you can also declare a property source bean:

https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/context/annotation/PropertySource.html

Answer 4

create you beans

@Configuration
@PropertySource("classpath:application.properties")
public class ApplicationBeansConfig {

    @Autowired
    Environment env;

    @Bean
    public IApplicationBeanService getService(){
        return new ApplicationBeansService(env);
    }
}

and then in service costructor

@Service
public class ApplicationBeansService implements IApplicationBeanService {
...
   public ApplicationBeansService(Environment env){
      ...
      String value = env.getProperty("your.value")
      ...
   }
...
}

don't forget fill your application.properties:

your.value = some-string-value