@ConfigurationProperties(prefix = "demo")
@Validated
public class AppProperties {

    private String vehicle;

    @Max(value = 999, message = "Value 'Property' should not be greater than 999")
    private Integer value;

    private Map<String,Integer> contexts;

    private StrategyEnum strategyEnum;

    private Resource resource;

    private DemoService service;

    public String getVehicle() {
        return vehicle;
    }

    public void setVehicle(String vehicle) {
        this.vehicle = vehicle;
    }

    public Map<String, Integer> getContexts() {
        return contexts;
    }

    public void setContexts(Map<String, Integer> contexts) {
        this.contexts = contexts;
    }

    public StrategyEnum getStrategyEnum() {
        return strategyEnum;
    }

    public void setStrategyEnum(StrategyEnum strategyEnum) {
        this.strategyEnum = strategyEnum;
    }

    public Resource getResource() {
        return resource;
    }

    public void setResource(Resource resource) {
        this.resource = resource;
    }

    public DemoService getService() {
        return service;
    }

    public void setService(DemoService service) {
        this.service = service;
    }

    public Integer getValue() {
        return value;
    }

    public void setValue(Integer value) {
        this.value = value;
    }

    @Override
    public String toString() {
        return "MyAppProperties{" +
                "\nvehicle=" + vehicle +
                "\n,contexts=" + contexts +
                "\n,service=" + service +
                "\n,value=" + value +
                "\n,strategyEnum=" + strategyEnum +
                '}';
    }

}

@SpringBootApplication
@EnableConfigurationProperties({AppProperties.class})
@ImportResource(value= "classpath:context.xml")
public class DemoConfigProcessorApplication {

	public static void main(String[] args) {
		ConfigurableApplicationContext context = SpringApplication.run(DemoConfigProcessorApplication.class, args);

		AppProperties properties = context.getBean(AppProperties.class);
		String perform = properties.getService().perform(properties.getVehicle());
		System.out.println("perform: " + perform);


		System.out.println(properties.toString());
	}

}

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>demoConfigProcessor</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>demoConfigProcessor</name>
	<description>Demo project for Spring Boot Configuration Processor</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.0.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-validation</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-configuration-processor</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>com.jayway.jsonpath</groupId>
			<artifactId>json-path</artifactId>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="service1" class="com.example.demoConfigProcessor.MyDemoService1">
        <description>Description MyDemoService 1</description>
    </bean>

    <bean id="service2" class="com.example.demoConfigProcessor.MyDemoService2">
        <description>Description MyDemoService 2</description>
    </bean>
</beans>

public interface DemoService {
  String perform(String value);
}

public class MyDemoService1 implements DemoService {

    @Override
    public String perform(String value) {
        return "Service №1: perform routine maintenance  work on <" + value +">";
    }
}

public class MyDemoService2 implements DemoService {

    @Override
    public String perform(String value) {
        return "Service №2: perform routine maintenance  work on <" + value +">";
    }

}

@Component
@ConfigurationPropertiesBinding
public class ServiceConverter implements Converter<String, DemoService> {

    @Autowired
    private ApplicationContext applicationContext;

    @Override
    public DemoService convert(String source) {
      return (DemoService) applicationContext.getBean(source);
    }
}

{
  "groups": [
    {
      "name": "demo",
      "type": "com.example.demoConfigProcessor.AppProperties",
      "sourceType": "com.example.demoConfigProcessor.AppProperties"
    }
  ],
  "properties": [
    {
      "name": "demo.contexts",
      "type": "java.util.Map<java.lang.String,java.lang.Integer>",
      "sourceType": "com.example.demoConfigProcessor.AppProperties"
    },
    {
      "name": "demo.vehicle",
      "type": "java.lang.String",
      "sourceType": "com.example.demoConfigProcessor.AppProperties"
    }
  ],
  "hints": [
    {
      "name": "demo.vehicle",
      "values": [
        {
          "value": "car make A",
          "description": "Car brand A is allowed."
        },
        {
          "value": "car make B",
          "description": "Car brand B is allowed."
        }
      ]
    },
    {
      "name": "demo.service",
      "providers": [
        {
          "name": "spring-bean-reference",
          "parameters": {
            "target": "com.example.demoConfigProcessor.DemoService"
          }
        }
      ]
    }
  ]
}