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eric-martineric-martin
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Merge pull request eugenp#7160 from papug145/BAEL-2921
BAEL-2921 Understanding getBean
2 parents d289cfa + 1c5e02d commit 1318804

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‎pom.xml‎

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<module>spring-cloud-data-flow</module>
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<module>spring-core</module>
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<module>spring-core-2</module>
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<module>spring-cucumber</module>
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<module>spring-data-rest</module>
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<module>spring-cloud-data-flow</module>
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<module>spring-core</module>
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<module>spring-core-2</module>
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<module>spring-cucumber</module>
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<module>spring-data-rest</module>

‎spring-core-2/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-spring-5</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-spring-5</relativePath>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>spring-core-2</artifactId>
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<dependencies>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-beans</artifactId>
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<version>${spring.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-context</artifactId>
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<version>${spring.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-core</artifactId>
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<version>${spring.version}</version>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<version>${junit.jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit.jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.22.1</version>
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</plugin>
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</plugins>
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</build>
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<properties>
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<spring.version>5.1.4.RELEASE</spring.version>
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<junit.jupiter.version>5.0.2</junit.jupiter.version>
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</properties>
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</project>

‎spring-core-2/src/main/java/com/baeldung/getbean/AnnotationConfig.java‎

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package com.baeldung.getbean;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.context.annotation.Scope;
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@Configuration
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class AnnotationConfig {
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@Bean(name = {"tiger", "kitty"})
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@Scope(value = "prototype")
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Tiger getTiger(String name) {
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return new Tiger(name);
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}
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@Bean(name = "lion")
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Lion getLion() {
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return new Lion("Hardcoded lion name");
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}
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interface Animal {}
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}

‎spring-core-2/src/main/java/com/baeldung/getbean/Lion.java‎

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package com.baeldung.getbean;
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class Lion implements AnnotationConfig.Animal {
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private String name;
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Lion(String name) {
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this.name = name;
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}
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String getName() {
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return name;
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}
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}

‎spring-core-2/src/main/java/com/baeldung/getbean/Tiger.java‎

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package com.baeldung.getbean;
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class Tiger implements AnnotationConfig.Animal {
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private String name;
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Tiger(String name) {
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this.name = name;
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}
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String getName() {
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return name;
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}
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}

‎spring-core-2/src/test/java/com/baeldung/getbean/GetBeanByNameAndTypeUnitTest.java‎

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package com.baeldung.getbean;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.TestInstance;
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import org.springframework.beans.factory.BeanNotOfRequiredTypeException;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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@TestInstance(TestInstance.Lifecycle.PER_CLASS)
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class GetBeanByNameAndTypeUnitTest {
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private ApplicationContext context;
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@BeforeAll
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void setup() {
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context = new AnnotationConfigApplicationContext(AnnotationConfig.class);
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}
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@Test
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void whenSpecifiedMatchingNameAndType_thenShouldReturnRelatedBean() {
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Lion lion = context.getBean("lion", Lion.class);
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assertEquals("Hardcoded lion name", lion.getName());
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}
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@Test
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void whenSpecifiedNotMatchingNameAndType_thenShouldThrowException() {
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assertThrows(BeanNotOfRequiredTypeException.class, () -> context.getBean("lion", Tiger.class));
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}
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}

‎spring-core-2/src/test/java/com/baeldung/getbean/GetBeanByNameUnitTest.java‎

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package com.baeldung.getbean;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.TestInstance;
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import org.springframework.beans.factory.NoSuchBeanDefinitionException;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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@TestInstance(TestInstance.Lifecycle.PER_CLASS)
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class GetBeanByNameUnitTest {
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private ApplicationContext context;
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@BeforeAll
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void setup() {
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context = new AnnotationConfigApplicationContext(AnnotationConfig.class);
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}
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@Test
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void whenGivenExistingBeanName_shouldReturnThatBean() {
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Object lion = context.getBean("lion");
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assertEquals(lion.getClass(), Lion.class);
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}
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@Test
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void whenGivenNonExistingBeanName_shouldThrowException() {
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assertThrows(NoSuchBeanDefinitionException.class, () -> context.getBean("non-existing"));
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}
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@Test
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void whenCastingToWrongType_thenShouldThrowException() {
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assertThrows(ClassCastException.class, () -> {
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Tiger tiger = (Tiger) context.getBean("lion");
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});
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}
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}

‎spring-core-2/src/test/java/com/baeldung/getbean/GetBeanByNameWithConstructorParametersUnitTest.java‎

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package com.baeldung.getbean;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.TestInstance;
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import org.springframework.beans.factory.UnsatisfiedDependencyException;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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@TestInstance(TestInstance.Lifecycle.PER_CLASS)
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class GetBeanByNameWithConstructorParametersUnitTest {
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private ApplicationContext context;
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@BeforeAll
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void setup() {
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context = new AnnotationConfigApplicationContext(AnnotationConfig.class);
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}
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@Test
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void whenGivenCorrectName_thenShouldReturnBeanWithSpecifiedName() {
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Tiger tiger = (Tiger) context.getBean("tiger", "Siberian");
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assertEquals("Siberian", tiger.getName());
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}
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@Test
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void whenGivenCorrectNameOrAlias_shouldReturnBeanWithSpecifiedName() {
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Tiger tiger = (Tiger) context.getBean("tiger", "Siberian");
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Tiger secondTiger = (Tiger) context.getBean("tiger", "Striped");
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assertEquals("Siberian", tiger.getName());
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assertEquals("Striped", secondTiger.getName());
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}
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@Test
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void whenNoArgumentSpecifiedForPrototypeBean_thenShouldThrowException() {
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assertThrows(UnsatisfiedDependencyException.class, () -> {
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Tiger tiger = (Tiger) context.getBean("tiger");
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});
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}
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}

‎spring-core-2/src/test/java/com/baeldung/getbean/GetBeanByTypeUnitTest.java‎

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package com.baeldung.getbean;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.TestInstance;
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import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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import static org.junit.jupiter.api.Assertions.assertNotNull;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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@TestInstance(TestInstance.Lifecycle.PER_CLASS)
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class GetBeanByTypeUnitTest {
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private ApplicationContext context;
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@BeforeAll
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void setup() {
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context = new AnnotationConfigApplicationContext(AnnotationConfig.class);
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}
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@Test
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void whenGivenExistingUniqueType_thenShouldReturnRelatedBean() {
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Lion lion = context.getBean(Lion.class);
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assertNotNull(lion);
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}
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@Test
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void whenGivenAmbiguousType_thenShouldThrowException() {
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assertThrows(NoUniqueBeanDefinitionException.class, () -> context.getBean(AnnotationConfig.Animal.class));
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}
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}

‎spring-core-2/src/test/java/com/baeldung/getbean/GetBeanByTypeWithConstructorParametersUnitTest.java‎

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package com.baeldung.getbean;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.TestInstance;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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@TestInstance(TestInstance.Lifecycle.PER_CLASS)
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class GetBeanByTypeWithConstructorParametersUnitTest {
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private ApplicationContext context;
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@BeforeAll
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void setup() {
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context = new AnnotationConfigApplicationContext(AnnotationConfig.class);
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}
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@Test
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void whenGivenExistingTypeAndValidParameters_thenShouldReturnRelatedBean() {
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Tiger tiger = context.getBean(Tiger.class, "Shere Khan");
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assertEquals("Shere Khan", tiger.getName());
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}
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}

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