Context Hierarchy Using Spring Boot Fluent Builder API

spring-boot-ctx-fluent/pom.xml

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+<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.baeldung</groupId>
+  <artifactId>ctxexample</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>ctxexample</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.0.0.RELEASE</version>
+	</parent>
+  <dependencies>
+  	<dependency>
+  		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-web</artifactId>
+  	</dependency>
+  </dependencies>
+</project>

spring-boot-ctx-fluent/src/main/java/com/baeldung/App.java

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+package com.baeldung;
+
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+
+import com.baeldung.rest.RestConfig;
+import com.baeldung.services.ServiceConfig;
+import com.baeldung.web.WebConfig;
+
+@SpringBootApplication
+public class App {
+    public static void main(String[] args) {
+        new SpringApplicationBuilder().parent(ServiceConfig.class)
+            .web(WebApplicationType.NONE)
+            .child(WebConfig.class)
+            .web(WebApplicationType.SERVLET)
+            .sibling(RestConfig.class)
+            .web(WebApplicationType.SERVLET)
+            .run(args);
+    }
+}

spring-boot-ctx-fluent/src/main/java/com/baeldung/rest/GreetingController.java

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+package com.baeldung.rest;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.services.IHomeService;
+
+@RestController
+public class GreetingController {
+
+    @Autowired
+    IHomeService homeService;
+
+    @GetMapping(value = "/greeting", produces = "application/json")
+    public String getGreeting() {
+        return homeService.getGreeting();
+    }
+}

spring-boot-ctx-fluent/src/main/java/com/baeldung/rest/RestConfig.java

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+package com.baeldung.rest;
+
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+@Configuration
+@ComponentScan("com.baeldung.rest")
+@EnableAutoConfiguration
+@PropertySource("classpath:rest-app.properties")
+public class RestConfig {
+
+}

spring-boot-ctx-fluent/src/main/java/com/baeldung/services/HomeService.java

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+package com.baeldung.services;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class HomeService implements IHomeService {
+
+    public String getGreeting() {
+        return "Welcome User";
+    }
+}

spring-boot-ctx-fluent/src/main/java/com/baeldung/services/IHomeService.java

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+package com.baeldung.services;
+
+public interface IHomeService {
+
+   String getGreeting();
+}

spring-boot-ctx-fluent/src/main/java/com/baeldung/services/ServiceConfig.java

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+package com.baeldung.services;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan("com.baeldung.services")
+public class ServiceConfig {}

spring-boot-ctx-fluent/src/main/java/com/baeldung/web/GreetingService.java

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+package com.baeldung.web;
+
+import org.springframework.stereotype.Service;
+
+import com.baeldung.services.IHomeService;
+
+@Service
+public class GreetingService implements IHomeService {
+
+    public String getGreeting() {
+        return "Greetings for the day";
+    }
+}

spring-boot-ctx-fluent/src/main/java/com/baeldung/web/HomeController.java

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+package com.baeldung.web;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import com.baeldung.services.IHomeService;
+
+@Controller
+public class HomeController {
+
+    @Autowired
+    IHomeService homeService;
+
+    @GetMapping("/home")
+    @ResponseBody
+    public String greeting() {
+
+        return homeService.getGreeting();
+    }
+}

spring-boot-ctx-fluent/src/main/java/com/baeldung/web/WebConfig.java

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+package com.baeldung.web;
+
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+import com.baeldung.services.IHomeService;
+
+@Configuration
+@ComponentScan("com.baeldung.web")
+@EnableAutoConfiguration
+@PropertySource("classpath:web-app.properties")
+public class WebConfig {
+    
+    @Bean
+    public IHomeService homeService() {
+        return new GreetingService();
+    }
+}

spring-boot-ctx-fluent/src/main/resources/rest-app.properties

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+server.port=8081
+server.servlet.context-path=/rest
+#logging.level=debug
+spring.application.admin.enabled=false
+spring.application.admin.jmx-name=org.springframework.boot:type=AdminRest,name=SpringRestApplication

spring-boot-ctx-fluent/src/main/resources/web-app.properties

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+server.port=8080
+spring.application.admin.enabled=false
+spring.application.admin.jmx-name=org.springframework.boot:type=WebAdmin,name=SpringWebApplication