How to autowired profile configuration class on startup?

Question

I'd like to create different database profile classes, each for a purpose of development, production and testing.

I tried the following with the help of http://spring.io/blog/2011/02/14/spring-3-1-m1-introducing-profile/, but it won't wire correctly. Why?

 interface DataConfig {
        DataSource dataSource();
    }

    @Configuration
    @Profile("dev")
    public class StandaloneDataConfig implements DataConfig {
        @Bean
        @Override
        public dataSource dataSource() {
            //return the ds
        }
    }

    @Configuration
    @Profile("prod")
    public class JndiDataConfig implements DataConfig { ... }

    @Configuration
    @PropertySource({"classpath:config.properties"})
    class AppConfig {
        @Autowired
        private DataConfig cfg;

    }

@Configuration
@ComponentScan
@Import(AppConfig.class)
@EnableTransactionManagement
public class SpringBootConfig extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }
}

config.properties:

spring.profiles.active=dev

Result: Exception on startup

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private DataConfig dataConfig; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [DataConfig] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    ... 34 common frames omitted

Spring 4.0.3.RELEASE

My setup though seem to work in general: if I remove the @Profile annotation on one of the databases, everything wires up correctly.

Answer 1

You need to rename your config.properties file to application.properties for Spring Boot to pick it up automatically.

Answer 2

I haven't tested your configuration, but my best guess (following some investigation I've done for this post) is that @PropertySources are not available for a @Conditional annotated @Configuration class when autowiring occurs.

According to the source code, @Profile is a @Conditional flavor of annotation with a Condition implementation. For @PropertySource to be available when they are needed I think you would need your own custom @Conditional implementation just like in the SO post I mentioned above, where you define not a Condition but a ConfigurationCondition making sure to be used at ConfigurationPhase.REGISTER_BEAN phase.