YAML property injection should work when including the base spring-boot module.

[berlin-ab]

When I include these dependencies:

dependencies {
    compile("org.springframework.boot:spring-boot:1+")
    compile("org.yaml:snakeyaml:1+")
}

And I have this config file:

example:
    someValue: foobar

Then I should be able to do this:

class Foo {
    @Value("${example.someValue}")
    String someValue;
}

@Autowired
public void example(Foo foo) {
    foo.someValue # should equal 'foobar'
}

[dsyer]

You haven't shown all the code you would need to get a Foo created, so I can't tell if you're doing something wrong or not. The Foo has to actually be a Spring component. E.g. (in separate files and then glued together by a @ComponentScan):

@Component
public class Foo {
    @Value("${example.someValue}")
    String someValue;
}

@Component
public class Thing {
    @Autowired
    public void example(Foo foo) {
        foo.someValue # should equal 'foobar'
    }
}

[dsyer]

Adam's sample app is here: https://github.com/berlin-ab/springbootblog/tree/blog/configuration. It works for me.

[berlin-ab]

I needed to create a bean:

    @Bean
    public PropertySourcesPlaceholderConfigurer configurer() {
        return new PropertySourcesPlaceholderConfigurer();
    }

It works now, but:

I do not think this should be necessary, but so far Spring Boot has not created Beans. I think the ability to configure using @Value should be out-of-the-box when including the base spring-boot package.

When using @value YAML values, I don't feel that I've left the core of Spring Boot. I've not yet asked for a web server, or a database, or a twitter client. I'm only looking for basic configuration information.

[dsyer]

Nevertheless this is a Core Spring "feature" (the non-appearance of a PropertySourcesPlaceholderConfigurer in a virgin ApplicationContext) and the only Boot feature you are really using is the opinionated location of the "application.yml". If you want the @Value to "just work" then you need to use @EnableAutoConfiguration.