BAEL-2940 Update Spring ComponentScanning. Moved componentscan code to new module.

spring-boot-di/pom.xml

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+<?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>
+    <artifactId>spring-boot-mvc</artifactId>
+    <name>spring-boot-mvc</name>
+    <packaging>jar</packaging>
+    <description>Module For Spring Boot DI</description>
+
+    <parent>
+        <artifactId>parent-boot-2</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-boot-2</relativePath>
+    </parent>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-tomcat</artifactId>
+            <scope>provided</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tomcat.embed</groupId>
+            <artifactId>tomcat-embed-jasper</artifactId>
+            <scope>provided</scope>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <configuration>
+                    <mainClass>com.baeldung.SpringBootDiApplication</mainClass>
+                    <layout>JAR</layout>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <start-class>com.baeldung.SpringBootDiApplication</start-class>
+    </properties>
+
+</project>

spring-boot-di/src/main/java/com/baeldung/SpringBootDiApplication.java

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+package com.baeldung;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringBootDiApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringBootDiApplication.class, args);
+    }
+}

spring-boot-di/src/main/java/com/baeldung/componentscan/ExampleBean.java

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+package com.baeldung.componentscan;
+
+public class ExampleBean {
+
+}

spring-boot-di/src/main/java/com/baeldung/componentscan/springapp/SpringComponentScanApp.java

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+package com.baeldung.componentscan.springapp;
+
+import com.baeldung.componentscan.ExampleBean;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan
+//@ComponentScan(excludeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = Rose.class))
+//@ComponentScan(basePackages = "com.baeldung.componentscan.springapp")
+//@ComponentScan(basePackages = "com.baeldung.componentscan.springapp.animals")
+//@ComponentScan (excludeFilters = @ComponentScan.Filter(type=FilterType.REGEX,pattern="com\\.baeldung\\.componentscan\\.springapp\\.flowers\\..*"))
+public class SpringComponentScanApp {
+
+    private static ApplicationContext applicationContext;
+
+    @Bean
+    public ExampleBean exampleBean() {
+        return new ExampleBean();
+    }
+
+    public static void main(String[] args) {
+        applicationContext = new AnnotationConfigApplicationContext(SpringComponentScanApp.class);
+
+        for (String beanName : applicationContext.getBeanDefinitionNames()) {
+            System.out.println(beanName);
+        }
+    }
+
+}

spring-boot-di/src/main/java/com/baeldung/componentscan/springapp/animals/Cat.java

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+package com.baeldung.componentscan.springapp.animals;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Cat {
+
+}

spring-boot-di/src/main/java/com/baeldung/componentscan/springapp/animals/Dog.java

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+package com.baeldung.componentscan.springapp.animals;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Dog {
+
+}

spring-boot-di/src/main/java/com/baeldung/componentscan/springapp/flowers/Rose.java

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+package com.baeldung.componentscan.springapp.flowers;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Rose {
+
+}

spring-boot-di/src/main/java/com/baeldung/componentscan/springbootapp/SpringBootComponentScanApp.java

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+package com.baeldung.componentscan.springbootapp;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+
+import com.baeldung.componentscan.ExampleBean;
+
+@SpringBootApplication
+//@ComponentScan(basePackages = "com.baeldung.componentscan.springbootapp.animals")
+//@ComponentScan ( excludeFilters = @ComponentScan.Filter(type=FilterType.REGEX,pattern="com\\.baeldung\\.componentscan\\.springbootapp\\.flowers\\..*"))
+//@ComponentScan(excludeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = Rose.class))
+
+public class SpringBootComponentScanApp {
+    private static ApplicationContext applicationContext;
+
+    @Bean
+    public ExampleBean exampleBean() {
+        return new ExampleBean();
+    }
+
+    public static void main(String[] args) {
+        applicationContext = SpringApplication.run(SpringBootComponentScanApp.class, args);
+        checkBeansPresence("cat", "dog", "rose", "exampleBean", "springBootApp");
+
+    }
+
+    private static void checkBeansPresence(String... beans) {
+        for (String beanName : beans) {
+            System.out.println("Is " + beanName + " in ApplicationContext: " + applicationContext.containsBean(beanName));
+        }
+    }
+}

spring-boot-di/src/main/java/com/baeldung/componentscan/springbootapp/animals/Cat.java

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+package com.baeldung.componentscan.springbootapp.animals;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Cat {
+
+}

spring-boot-di/src/main/java/com/baeldung/componentscan/springbootapp/animals/Dog.java

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+package com.baeldung.componentscan.springbootapp.animals;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Dog {
+
+}

spring-boot-di/src/main/java/com/baeldung/componentscan/springbootapp/flowers/Rose.java

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+package com.baeldung.componentscan.springbootapp.flowers;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Rose {
+
+}