[FIXED] Why is Spring Boot not recognizing @Bean inside subpackage @Configuration?

Issue

I am setting up a project in Kotlin with Spring Security for login support. I am new to Spring Boot, so comments could be helpful. I have problem with Spring Boot not scanning my @Configuration class and inject the @Bean defined inside it. However, it recognized the same @Bean inside the @SpringBootApplication class.

I am not using WebSecurityConfigurerAdapter because it is now deprecated.

Using logging.level.org.springframework=DEBUG, I was able to confirm that spring boot recognized beans only when using @SpringBootApplication. While using @Configuration, it did NOT find it.

I don't want the bean to be there. I want to separate the bean into its own configuration file, in a subpackage, using the @Configuration. How do I do that?

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Here is a screenshot of the found bean when debugging, and the bean was defined in @SpringBootApplication.

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Here I have the different relevant class defintions:

Main class

@SpringBootApplication
class DemoApplication {
    // @Bean  // <--- this bean is recognized
    // fun pilterChain(http: HttpSecurity): SecurityFilterChain {
    //  http.authorizeRequests().anyRequest().anonymous().and().formLogin().and().httpBasic()
    //  return http.build()
    // }
}

fun main(args: Array<String>) {
    runApplication<DemoApplication>(*args) 
}

Controller class

@RestController
class MessageResource {
    @GetMapping
    fun index(): String = "Hello World"
}

SecurityConfig.kt in subpackage

@Configuration
class SecurityConfig {
    @Bean // <--- this bean is not recognized
    fun pilterChain(http: HttpSecurity): SecurityFilterChain {
        http.authorizeRequests().anyRequest().anonymous().and().formLogin().and().httpBasic()
        return http.build()
    }
}

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Edit 1: Add project structure

Solution

This is because your SecurityConfig is in a package that is not the same package of your DemoApplication or a child package of the package of DemoApplication.

To solve it move the package of SecurityConfig to the package of DemoApplication. It will then become a child package and should work.

Answered By - Daniel Jacob
Answer Checked By - Robin (JavaFixing Admin)