Spring Boot application is ignoring java config - spring-boot

Question

I have a fairly simple Spring Boot app I am working on that uses a few Java Config classes. However, it seems that the configuration is not being picked up. I have break points all over, but nothing gets tripped. I even tossed a few RuntimeExceptions just to see if maybe my debugger was on the fritz.
In my main class, I have the standard Spring Boot main:
#ComponentScan
#EnableAutoConfiguration
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
As you can see, I tagged it with #ComponentScan and #EnableAutoConfiguration. The Application class lives at the root of the classpath. My understanding of the #ComponentScan annotation is that it will search for all configuration classes beneath it.
In a package one layer down I have all the config classes:
My "Common" configuration
#Configuration
#EnableJpaRepositories("com.codechimp.XXX.repository")
#EnableTransactionManagement
public class AppCommonConfig {
#Inject
private Environment environment;
/* Define common beans here like datasource and such */
}
And my Spring Security configuration
#Configuration
#EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
#Inject
private LocalXXXUserDetailsService localXXXUserDetailsService;
/**
* #see org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter#configure(HttpSecurity)
*/
#Autowired
protected void configure(HttpSecurity http) throws Exception {
// Configure http
}
/**
* #see org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter#configureGlobal(AuthenticationManagerBuilder)
*/
#Autowired
protected void configureGlobal(AuthenticationManagerBuilder auth)
throws Exception {
// Configure auth
}
}
However, when I run the app, it doesn't seem to call any of the methods in either of these config classes. It's as if they are being completely ignored. As I said, I have tried setting break points and even throwing a RuntimeException right in the beginning of all the methods like so:
if (true)
throw new RuntimeException("Break!");
Admittedly I have not had much experience with using Java Config, but I have been over the docs again and again and I am not seeing the missing piece(s).

Answer 1

I think you need your Application to be a #Configuration.
It's not a great idea to do a #ComponentScan from the default package (I assume that's what you mean by "the root of the classpath"). That would definitely switch some things off, but more seriously it causes a huge scan of all jars on your classpath, which is not a great idea (and can cause the app to fail).

Answer 2

You need to add
#SpringBootApplication
to your Spring Boot main class. From the docs:
/**
* Indicates a {#link Configuration configuration} class that declares one or more
* {#link Bean #Bean} methods and also triggers {#link EnableAutoConfiguration
* auto-configuration} and {#link ComponentScan component scanning}. This is a convenience
* annotation that is equivalent to declaring {#code #Configuration},
* {#code #EnableAutoConfiguration} and {#code #ComponentScan}.
*
* #author Phillip Webb
* #author Stephane Nicoll
* #since 1.2.0
*/