JAVA-84: Moved 1 article to spring-boot-di

spring-boot-modules/spring-boot-di/README.md

@@ -9,3 +9,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 
 - [Spring Component Scanning](https://www.baeldung.com/spring-component-scanning)
 - [Spring @ComponentScan – Filter Types](https://www.baeldung.com/spring-componentscan-filter-type)
+- [How to Get All Spring-Managed Beans?](https://www.baeldung.com/spring-show-all-beans)

spring-boot-modules/spring-boot-di/pom.xml

@@ -27,6 +27,12 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
+        
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
+        
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-tomcat</artifactId>

spring-boot-modules/spring-boot-di/src/main/java/com/baeldung/displayallbeans/Application.java

@@ -0,0 +1,23 @@
+package com.baeldung.displayallbeans;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+
+@SpringBootApplication
+public class Application {
+    private static ApplicationContext applicationContext;
+
+    public static void main(String[] args) {
+        applicationContext = SpringApplication.run(Application.class, args);
+
+        displayAllBeans();
+    }
+
+    public static void displayAllBeans() {
+        String[] allBeanNames = applicationContext.getBeanDefinitionNames();
+        for (String beanName : allBeanNames) {
+            System.out.println(beanName);
+        }
+    }
+}

spring-boot-modules/spring-boot-di/src/main/java/com/baeldung/displayallbeans/controller/FooController.java

@@ -0,0 +1,23 @@
+package com.baeldung.displayallbeans.controller;
+
+import java.util.Map;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+
+import com.baeldung.displayallbeans.service.FooService;
+
+@Controller
+public class FooController {
+    @Autowired
+    private FooService fooService;
+
+    @GetMapping(value = "/displayallbeans")
+    public ResponseEntity<String> getHeaderAndBody(Map<String, Object> model) {
+        model.put("header", fooService.getHeader());
+        model.put("message", fooService.getBody());
+        return ResponseEntity.ok("displayallbeans");
+    }
+}

spring-boot-modules/spring-boot-di/src/main/java/com/baeldung/displayallbeans/service/FooService.java

@@ -0,0 +1,16 @@
+package com.baeldung.displayallbeans.service;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class FooService {
+
+    public String getHeader() {
+        return "Display All Beans";
+    }
+
+    public String getBody() {
+        return "This is a sample application that displays all beans " + "in Spring IoC container using ListableBeanFactory interface " + "and Spring Boot Actuators.";
+    }
+
+}

spring-boot-modules/spring-boot-di/src/test/java/com/baeldung/displayallbeans/DisplayBeanIntegrationTest.java

@@ -0,0 +1,101 @@
+package com.baeldung.displayallbeans;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.BDDAssertions.then;
+
+import java.net.URI;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.actuate.beans.BeansEndpoint.ContextBeans;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.RequestEntity;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.web.context.WebApplicationContext;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = Application.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@TestPropertySource(properties = { "management.port=0", "management.endpoints.web.exposure.include=*" })
+public class DisplayBeanIntegrationTest {
+
+    @LocalServerPort
+    private int port;
+
+    @Value("${local.management.port}")
+    private int mgt;
+
+    @Autowired
+    private TestRestTemplate testRestTemplate;
+
+    @Autowired
+    private WebApplicationContext context;
+
+    private static final String ACTUATOR_PATH = "/actuator";
+
+    @Test
+    public void givenRestTemplate_whenAccessServerUrl_thenHttpStatusOK() throws Exception {
+        ResponseEntity<String> entity = this.testRestTemplate.getForEntity("http://localhost:" + this.port + "/displayallbeans", String.class);
+
+        then(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+    }
+
+    @Test
+    public void givenRestTemplate_whenAccessEndpointUrl_thenHttpStatusOK() throws Exception {
+        ParameterizedTypeReference<Map<String, ContextBeans>> responseType = new ParameterizedTypeReference<Map<String, ContextBeans>>() {
+        };
+        RequestEntity<Void> requestEntity = RequestEntity.get(new URI("http://localhost:" + this.mgt + ACTUATOR_PATH + "/beans"))
+            .accept(MediaType.APPLICATION_JSON)
+            .build();
+        ResponseEntity<Map<String, ContextBeans>> entity = this.testRestTemplate.exchange(requestEntity, responseType);
+
+        then(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+    }
+
+    @Test
+    public void givenRestTemplate_whenAccessEndpointUrl_thenReturnsBeanNames() throws Exception {
+        RequestEntity<Void> requestEntity = RequestEntity.get(new URI("http://localhost:" + this.mgt + ACTUATOR_PATH + "/beans"))
+            .accept(MediaType.APPLICATION_JSON)
+            .build();
+        ResponseEntity<BeanActuatorResponse> entity = this.testRestTemplate.exchange(requestEntity, BeanActuatorResponse.class);
+
+        Collection<String> beanNamesList = entity.getBody()
+            .getBeans();
+
+        assertThat(beanNamesList).contains("fooController", "fooService");
+    }
+
+    @Test
+    public void givenWebApplicationContext_whenAccessGetBeanDefinitionNames_thenReturnsBeanNames() throws Exception {
+        String[] beanNames = context.getBeanDefinitionNames();
+
+        List<String> beanNamesList = Arrays.asList(beanNames);
+        assertThat(beanNamesList).contains("fooController", "fooService");
+    }
+
+    private static class BeanActuatorResponse {
+        private Map<String, Map<String, Map<String, Map<String, Object>>>> contexts;
+
+        public Collection<String> getBeans() {
+            return this.contexts.get("application")
+                .get("beans")
+                .keySet();
+        }
+
+        public Map<String, Map<String, Map<String, Map<String, Object>>>> getContexts() {
+            return contexts;
+        }
+    }
+}