Added a new module (spring-core-5) for the code examples of BAEL-4764. (#10484)

pom.xml

@@ -631,6 +631,7 @@
                 <module>spring-core-2</module>
                 <module>spring-core-3</module>
                 <module>spring-core-4</module>
+                <module>spring-core-5</module>
                 <module>spring-cucumber</module>
 
                 <module>spring-data-rest</module>
@@ -1082,6 +1083,7 @@
                 <module>spring-core-2</module>
                 <module>spring-core-3</module>
                 <module>spring-core-4</module>
+                <module>spring-core-5</module>
                 <module>spring-cucumber</module>
 
                 <module>spring-data-rest</module>

spring-core-3/README.md

@@ -11,4 +11,4 @@ This module contains articles about core Spring functionality
 - [Difference Between BeanFactory and ApplicationContext](https://www.baeldung.com/spring-beanfactory-vs-applicationcontext)
 - [A Spring Custom Annotation for a Better DAO](http://www.baeldung.com/spring-annotation-bean-pre-processor)
 - [Custom Scope in Spring](http://www.baeldung.com/spring-custom-scope)
-- More articles: [[<-- prev]](/spring-core-2)
+- More articles: [[<-- prev]](/spring-core-2) [[next -->]](/spring-core-4)

spring-core-4/README.md

@@ -11,4 +11,4 @@ This module contains articles about core Spring functionality
 - [Using @Autowired in Abstract Classes](https://www.baeldung.com/spring-autowired-abstract-class)
 - [Constructor Injection in Spring with Lombok](https://www.baeldung.com/spring-injection-lombok)
 - [The Spring ApplicationContext](https://www.baeldung.com/spring-application-context)
-- More articles: [[<-- prev]](/spring-core-3)
+- More articles: [[<-- prev]](/spring-core-3) [[next -->]](/spring-core-5)

spring-core-5/README.md

@@ -0,0 +1,7 @@
+## Spring Core
+
+This module contains articles about core Spring functionality
+
+## Relevant Articles:
+
+- More articles: [[<-- prev]](/spring-core-4)

spring-core-5/pom.xml

@@ -0,0 +1,46 @@
+<?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-core-5</artifactId>
+    <name>spring-core-5</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-spring-5</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-spring-5</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+            <version>${spring-boot-starter.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <version>${spring-boot-starter.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven.surefire.version}</version>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <spring.version>5.3.3</spring.version>
+        <spring-boot-starter.version>2.4.2</spring-boot-starter.version>
+        <maven.surefire.version>2.22.1</maven.surefire.version>
+    </properties>
+
+</project>

spring-core-5/src/main/java/com/baeldung/component/inscope/AmbiguousBean.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public interface AmbiguousBean {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/BeanExample.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public class BeanExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/BeanImplA.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public class BeanImplA implements AmbiguousBean {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/BeanImplB.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.inscope;
+
+public class BeanImplB implements AmbiguousBean {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/ComponentApplication.java

@@ -0,0 +1,42 @@
+package com.baeldung.component.inscope;
+
+import com.baeldung.component.outsidescope.OutsideScopeBeanExample;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@SpringBootApplication
+@ComponentScan({"com.baeldung.component.inscope", "com.baeldung.component.scannedscope"})
+@Configuration
+public class ComponentApplication {
+
+    @Value( "${ambiguous-bean}" )
+    public String ambiguousBean;
+
+    public static void main(String[] args) {
+        SpringApplication.run( ComponentApplication.class, args );
+    }
+
+    @Bean
+    public BeanExample beanExample() {
+        return new BeanExample();
+    }
+
+    @Bean
+    public OutsideScopeBeanExample outsideScopeBeanExample() {
+        return new OutsideScopeBeanExample();
+    }
+
+    @Bean
+    public AmbiguousBean ambiguousBean() {
+        if (ambiguousBean.equals("A")) {
+            return new BeanImplA();
+        }
+        else {
+            return new BeanImplB();
+        }
+    }
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/ComponentExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class ComponentExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/ControllerExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Controller;
+
+@Controller
+public class ControllerExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/CustomComponent.java

@@ -0,0 +1,14 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Component;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+@Component
+public @interface CustomComponent {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/CustomComponentExample.java

@@ -0,0 +1,5 @@
+package com.baeldung.component.inscope;
+
+@CustomComponent
+public class CustomComponentExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/RepositoryExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class RepositoryExample {
+}

spring-core-5/src/main/java/com/baeldung/component/inscope/ServiceExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.inscope;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class ServiceExample {
+}

spring-core-5/src/main/java/com/baeldung/component/outsidescope/OutsideScopeBeanExample.java

@@ -0,0 +1,4 @@
+package com.baeldung.component.outsidescope;
+
+public class OutsideScopeBeanExample {
+}

spring-core-5/src/main/java/com/baeldung/component/outsidescope/OutsideScopeExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.outsidescope;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class OutsideScopeExample {
+}

spring-core-5/src/main/java/com/baeldung/component/scannedscope/ScannedScopeExample.java

@@ -0,0 +1,7 @@
+package com.baeldung.component.scannedscope;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class ScannedScopeExample {
+}

spring-core-5/src/main/resources/application.yml

@@ -0,0 +1 @@
+ambiguous-bean: 'A'

spring-core-5/src/test/java/com/baeldung/component/inscope/ComponentUnitTest.java

@@ -0,0 +1,54 @@
+package com.baeldung.component.inscope;
+
+import com.baeldung.component.outsidescope.OutsideScopeBeanExample;
+import com.baeldung.component.outsidescope.OutsideScopeExample;
+import com.baeldung.component.scannedscope.ScannedScopeExample;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.ApplicationContext;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+@ExtendWith(SpringExtension.class)
+public class ComponentUnitTest {
+
+    @Autowired
+    private ApplicationContext applicationContext;
+
+    @Test
+    public void givenInScopeComponents_whenSearchingInApplicationContext_thenFindThem() {
+        assertNotNull(applicationContext.getBean(ControllerExample.class));
+        assertNotNull(applicationContext.getBean(ServiceExample.class));
+        assertNotNull(applicationContext.getBean(RepositoryExample.class));
+        assertNotNull(applicationContext.getBean(ComponentExample.class));
+        assertNotNull(applicationContext.getBean(CustomComponentExample.class));
+    }
+
+    @Test
+    public void givenOutsideScopeComponent_whenSearchingInApplicationContext_thenFail() {
+        assertThrows(NoSuchBeanDefinitionException.class, () -> applicationContext.getBean(OutsideScopeExample.class));
+    }
+
+    @Test
+    public void givenScannedScopeComponent_whenSearchingInApplicationContext_thenFindIt() {
+        assertNotNull(applicationContext.getBean(ScannedScopeExample.class));
+    }
+
+    @Test
+    public void givenBeanComponents_whenSearchingInApplicationContext_thenFindThem() {
+        assertNotNull(applicationContext.getBean(BeanExample.class));
+        assertNotNull(applicationContext.getBean(OutsideScopeBeanExample.class));
+    }
+
+    @Test
+    public void givenAmbiguousBeanSetToB_whenSearchingInApplicationContext_thenFindImplB() {
+        AmbiguousBean ambiguousBean = applicationContext.getBean(AmbiguousBean.class);
+        assertNotNull(ambiguousBean);
+        assertTrue(ambiguousBean instanceof BeanImplB);
+    }
+}

spring-core-5/src/test/resources/application.yml

@@ -0,0 +1 @@
+ambiguous-bean: 'B'