BAEL-859 How to display/list all Spring-managed beans? (#2021)

* Display all beans in Spring Container

* Display all spring managed beans

Add code to configure 'beans' endpoint.

* Added 'spring-boot-starter-test' dependency

Added 'spring-boot-starter-test' dependency with scope 'test'

* Display all spring managed beans Test cases

Added test cases for 'Display all spring managed beans' module.

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

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+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);
+        
+        String[] allBeanNames = applicationContext.getBeanDefinitionNames();
+        for(String beanName : allBeanNames) {
+            System.out.println(beanName);
+        }
+    }
+}

spring-boot/src/main/java/com/baeldung/displayallbeans/SpringConfig.java

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+package com.baeldung.displayallbeans;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+
+import com.baeldung.displayallbeans.model.Person;
+
+@Configuration
+@ComponentScan(basePackages = "com.baeldung.displayallbeans")
+public class SpringConfig {
+    @Bean
+    public Person person() {
+        Person person = new Person();
+        person.setName("Jon Doe");
+        return person;
+    }
+}

spring-boot/src/main/java/com/baeldung/displayallbeans/controller/PersonController.java

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+package com.baeldung.displayallbeans.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import com.baeldung.displayallbeans.model.Person;
+
+@Controller
+public class PersonController {
+    @Autowired
+    Person person;
+    
+    @RequestMapping("/getPerson")
+    public @ResponseBody Person getPerson() {
+        return person;
+    }
+}

spring-boot/src/main/java/com/baeldung/displayallbeans/model/Person.java

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+package com.baeldung.displayallbeans.model;
+
+public class Person {
+    String name;
+    
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}