Spring boot - binding properties [Configuration properties]

I work on spring boot version: 2.0.2.RELEASE. In my application.yml I have:

cars:
  color-to-brands:
    red: car1, car2
    blue: car3, car4

and my config class looks like this:

@Getter @Setter
@Configuration
@ConfigurationProperties(prefix = "cars")
public class CarsProperties {

    private Map<String, List<String>> colorToBrands = Collections.emptyMap();
}

When I start the app, I'm keep getting:

Failed to bind properties under 'cars.color-to-brands' to java.util.Map>:

Reason: Failed to bind properties under 'cars.color-to-brands' to java.util.Map<java.lang.String, java.util.List<java.lang.String>>

Action:

Update your application's configuration

Now, to summarize what I have already done to fix it:

1. According to documentation I have added a dependency that gives me annotation processor for my @ConfigurationProperties:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-configuration-processor</artifactId>
  <version>${spring-boot.version}</version>
  <optional>true</optional>
</dependency>

2. I have annotation processor enabled. I'm using Intellij. Annotation processors -> Maven default annotation processors profile has ticked Enable annotation processing, Processor path: contains (...)\.m2\repository\org\springframework\boot\spring-boot-configuration-processor\2.0.2.RELEASE\spring-boot-configuration-processor-2.0.2.RELEASE.jar, Store generated sources relative to: Module content root,

3. In the pom file I've added path for this processor (among others I use):

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
  <source>1.8</source>
  <target>1.8</target>
  <annotationProcessorPaths>
      <path>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <version>${lombok.version}</version>
      </path>
      <path>
          <groupId>org.mapstruct</groupId>
          <artifactId>mapstruct-processor</artifactId>
          <version>${mapstruct.version}</version>
      </path>
      <path>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-configuration-processor</artifactId>
          <version>${spring-boot.version}</version>
      </path>
  </annotationProcessorPaths>
  <compilerArgs>
      <compilerArg>
          -Amapstruct.defaultComponentModel=spring
      </compilerArg>
  </compilerArgs>
</configuration>

4. In addition, intellij keep showing me a popup inside the CarsProperties:

Re-run Spring Boot Configuration Annotation Processor to update generated metadata

5. I've skipped @EnableConfigurationProperties as:

Spring Boot documentation says, every project automatically includes @EnableConfigurationProperties.

6. Somewhere in between I also did: Reimport All Maven Projects, clean install, Rebuild project, and Invalid Caches and Restart

I'm sitting in front of that computer for few hours now, Can't get it done. What am I doing wrong ? Why it doesn't want to work ?