Merge pull request #10098 from anirban99/feature/bael-4334/ComponentScan-and-EnableAutoConfiguration-in-Spring-Boot

BAEL-4334: ComponentScan and EnableAutoConfiguration in Spring Boot

spring-boot-modules/spring-boot-annotations/src/main/java/com/baeldung/annotations/EmployeeApplication.java

@@ -0,0 +1,19 @@
+package com.baeldung.annotations;
+
+import com.baeldung.annotations.componentscanautoconfigure.teacher.Teacher;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.ComponentScan;
+
+@ComponentScan(basePackages = {"com.baeldung.annotations.componentscanautoconfigure.healthcare",
+        "com.baeldung.annotations.componentscanautoconfigure.employee"},
+        basePackageClasses = Teacher.class)
+@EnableAutoConfiguration(exclude = {JdbcTemplateAutoConfiguration.class})
+//@EnableAutoConfiguration(excludeName = {"org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration"})
+public class EmployeeApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(EmployeeApplication.class, args);
+    }
+}

spring-boot-modules/spring-boot-annotations/src/main/java/com/baeldung/annotations/componentscanautoconfigure/employee/Employee.java

@@ -0,0 +1,12 @@
+package com.baeldung.annotations.componentscanautoconfigure.employee;
+
+import org.springframework.stereotype.Component;
+
+@Component("employee")
+public class Employee {
+
+    @Override
+    public String toString() {
+        return "Employee" + this.hashCode();
+    }
+}

spring-boot-modules/spring-boot-annotations/src/main/java/com/baeldung/annotations/componentscanautoconfigure/employee/SeniorEmployee.java

@@ -0,0 +1,12 @@
+package com.baeldung.annotations.componentscanautoconfigure.employee;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class SeniorEmployee {
+
+    @Override
+    public String toString() {
+        return "Senior Employee" + this.hashCode();
+    }
+}

spring-boot-modules/spring-boot-annotations/src/main/java/com/baeldung/annotations/componentscanautoconfigure/healthcare/Doctor.java

@@ -0,0 +1,9 @@
+package com.baeldung.annotations.componentscanautoconfigure.healthcare;
+
+public class Doctor {
+
+    @Override
+    public String toString() {
+        return "Doctor" + this.hashCode();
+    }
+}

spring-boot-modules/spring-boot-annotations/src/main/java/com/baeldung/annotations/componentscanautoconfigure/healthcare/Hospital.java

@@ -0,0 +1,13 @@
+package com.baeldung.annotations.componentscanautoconfigure.healthcare;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class Hospital {
+
+    @Bean("doctor")
+    public Doctor getDoctor() {
+        return new Doctor();
+    }
+}

spring-boot-modules/spring-boot-annotations/src/main/java/com/baeldung/annotations/componentscanautoconfigure/student/Student.java

@@ -0,0 +1,12 @@
+package com.baeldung.annotations.componentscanautoconfigure.student;
+
+import org.springframework.stereotype.Component;
+
+@Component("student")
+public class Student {
+
+    @Override
+    public String toString() {
+        return "Student" + this.hashCode();
+    }
+}

spring-boot-modules/spring-boot-annotations/src/main/java/com/baeldung/annotations/componentscanautoconfigure/teacher/Teacher.java

@@ -0,0 +1,12 @@
+package com.baeldung.annotations.componentscanautoconfigure.teacher;
+
+import org.springframework.stereotype.Component;
+
+@Component("teacher")
+public class Teacher {
+
+    @Override
+    public String toString() {
+        return "Teacher" + this.hashCode();
+    }
+}

spring-boot-modules/spring-boot-annotations/src/main/test/com.baeldung.annotations/EmployeeApplicationTest.java

@@ -0,0 +1,23 @@
+package com.baeldung.annotations;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertAll;
+
+public class EmployeeApplicationTest {
+    private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+            .withUserConfiguration(EmployeeApplication.class);
+
+    @Test
+    void whenApplicationContextRuns_thenContainAllDefinedBeans() {
+        contextRunner.run(context -> assertAll(
+                () -> assertTrue(context.containsBeanDefinition("employee")),
+                () -> assertTrue(context.containsBeanDefinition("seniorEmployee")),
+                () -> assertTrue(context.containsBeanDefinition("doctor")),
+                () -> assertTrue(context.containsBeanDefinition("hospital")),
+                () -> assertFalse(context.containsBeanDefinition("student")),
+                () -> assertTrue(context.containsBeanDefinition("teacher"))));
+    }
+}