JAVA-19555 Move articles from spring-core-5 module to spring-boot-annotations-2 module (#13711)

* JAVA-19555 Move articles from spring-core-5 module to spring-boot-annotations-2 module * JAVA-19555 Move articles from spring-core module to spring-boot-annotations-2 module
2023-03-26 23:55:47 +05:30
parent 2e129bd64b
commit a50d41a8ce
39 changed files with 9 additions and 4 deletions
@@ -0,0 +1,29 @@
+package com.baeldung.aliasfor;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.core.annotation.AliasFor;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+@Target({ElementType.METHOD, ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+@RequestMapping
+public @interface MyMapping {
+
+    @AliasFor(annotation = RequestMapping.class, attribute = "method")
+    RequestMethod[] action() default {};
+    
+    @AliasFor(annotation = RequestMapping.class, attribute = "path")
+    String[] value() default {};
+
+    @AliasFor(annotation = RequestMapping.class, attribute = "path")
+    String[] mapping() default {};
+    
+    @AliasFor(annotation = RequestMapping.class, attribute = "path")
+    String[] route() default {};
+
+}
@@ -0,0 +1,13 @@
+package com.baeldung.aliasfor;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+@Controller
+public class MyMappingController {
+
+    @MyMapping(action = RequestMethod.PATCH, route = "/test")
+    public void mappingMethod() {
+    }
+    
+}
@@ -0,0 +1,23 @@
+package com.baeldung.lazy;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Lazy;
+
+@Lazy
+@Configuration
+@ComponentScan(basePackages = "com.baeldung.lazy")
+public class AppConfig {
+
+    @Lazy
+    @Bean
+    public Region getRegion(){
+        return new Region();
+    }
+
+    @Bean
+    public Country getCountry(){
+        return new Country();
+    }
+}
@@ -0,0 +1,13 @@
+package com.baeldung.lazy;
+
+import org.springframework.context.annotation.Lazy;
+import org.springframework.stereotype.Component;
+
+@Lazy
+@Component
+public class City {
+
+    public City() {
+        System.out.println("City bean initialized");
+    }
+}
@@ -0,0 +1,8 @@
+package com.baeldung.lazy;
+
+public class Country {
+
+    public Country() {
+        System.out.println("Country bean initialized");
+    }
+}
@@ -0,0 +1,19 @@
+package com.baeldung.lazy;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Lazy;
+
+public class Region {
+
+    @Lazy
+    @Autowired
+    private City city;
+
+    public Region() {
+        System.out.println("Region bean initialized");
+    }
+
+    public City getCityInstance() {
+        return city;
+    }
+}
@@ -0,0 +1,17 @@
+package com.baeldung.multibeaninstantiation.solution1;
+
+public class Person {
+    private String firstName;
+    private String lastName;
+
+    public Person(String firstName, String secondName) {
+        super();
+        this.firstName = firstName;
+        this.lastName = secondName;
+    }
+
+    @Override
+    public String toString() {
+        return "Person [firstName=" + firstName + ", secondName=" + lastName + "]";
+    }
+}
@@ -0,0 +1,17 @@
+package com.baeldung.multibeaninstantiation.solution1;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class PersonConfig {
+    @Bean
+    public Person personOne() {
+        return new Person("Harold", "Finch");
+    }
+
+    @Bean
+    public Person personTwo() {
+        return new Person("John", "Reese");
+    }
+}
@@ -0,0 +1,11 @@
+package com.baeldung.multibeaninstantiation.solution1;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringApp1 {
+    public static void main(String[] args) {
+        SpringApplication.run(SpringApp1.class, args);
+    }
+}
@@ -0,0 +1,17 @@
+package com.baeldung.multibeaninstantiation.solution2;
+
+public class Person {
+    private String firstName;
+    private String lastName;
+
+    public Person(String firstName, String secondName) {
+        super();
+        this.firstName = firstName;
+        this.lastName = secondName;
+    }
+
+    @Override
+    public String toString() {
+        return "Person [firstName=" + firstName + ", secondName=" + lastName + "]";
+    }
+}
@@ -0,0 +1,10 @@
+package com.baeldung.multibeaninstantiation.solution2;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan("com.baeldung.multibeaninstantiation.solution2")
+public class PersonConfig {
+
+}
@@ -0,0 +1,13 @@
+package com.baeldung.multibeaninstantiation.solution2;
+
+import org.springframework.stereotype.Component;
+
+import com.baeldung.multibeaninstantiation.solution2.Person;
+
+@Component
+public class PersonOne extends Person {
+
+    public PersonOne() {
+        super("Harold", "Finch");
+    }
+}
@@ -0,0 +1,13 @@
+package com.baeldung.multibeaninstantiation.solution2;
+
+import org.springframework.stereotype.Component;
+
+import com.baeldung.multibeaninstantiation.solution2.Person;
+
+@Component
+public class PersonTwo extends Person {
+
+    public PersonTwo() {
+        super("John", "Reese");
+    }
+}
@@ -0,0 +1,11 @@
+package com.baeldung.multibeaninstantiation.solution2;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringApp2 {
+    public static void main(String[] args) {
+        SpringApplication.run(SpringApp2.class, args);
+    }
+}
@@ -0,0 +1,33 @@
+package com.baeldung.multibeaninstantiation.solution3;
+
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.util.Assert;
+
+public class Human implements InitializingBean {
+
+    private Person personOne;
+
+    private Person personTwo;
+
+    @Override
+    public void afterPropertiesSet() throws Exception {
+        Assert.notNull(personOne, "Harold is alive!");
+        Assert.notNull(personTwo, "John is alive!");
+    }
+
+    /* Setter injection */
+    @Autowired
+    public void setPersonOne(Person personOne) {
+        this.personOne = personOne;
+        this.personOne.setFirstName("Harold");
+        this.personOne.setSecondName("Finch");
+    }
+
+    @Autowired
+    public void setPersonTwo(Person personTwo) {
+        this.personTwo = personTwo;
+        this.personTwo.setFirstName("John");
+        this.personTwo.setSecondName("Reese");
+    }
+}
@@ -0,0 +1,9 @@
+package com.baeldung.multibeaninstantiation.solution3;
+
+import java.util.List;
+
+public interface MultiBeanFactory<T> {
+    List<T> getObject(String name) throws Exception;
+
+    Class<?> getObjectType();
+}
@@ -0,0 +1,49 @@
+package com.baeldung.multibeaninstantiation.solution3;
+
+import org.springframework.beans.factory.FactoryBean;
+import org.springframework.beans.factory.annotation.Qualifier;
+
+@Qualifier(value = "personOne, personTwo")
+public class Person implements FactoryBean<Object> {
+    private String firstName;
+    private String secondName;
+
+    public Person() {
+        // initialization code (optional)
+    }
+
+    @Override
+    public Class<Person> getObjectType() {
+        return Person.class;
+    }
+
+    @Override
+    public Object getObject() throws Exception {
+        return new Person();
+    }
+
+    public boolean isSingleton() {
+        return true;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getSecondName() {
+        return secondName;
+    }
+
+    public void setSecondName(String secondName) {
+        this.secondName = secondName;
+    }
+
+    @Override
+    public String toString() {
+        return "Person [firstName=" + firstName + ", secondName=" + secondName + "]";
+    }
+}
@@ -0,0 +1,22 @@
+package com.baeldung.multibeaninstantiation.solution3;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class PersonConfig {
+    @Bean
+    public PersonFactoryPostProcessor PersonFactoryPostProcessor() {
+        return new PersonFactoryPostProcessor();
+    }
+
+    @Bean
+    public Person person() {
+        return new Person();
+    }
+
+    @Bean
+    public Human human() {
+        return new Human();
+    }
+}
@@ -0,0 +1,33 @@
+package com.baeldung.multibeaninstantiation.solution3;
+
+import java.util.Map;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+
+public class PersonFactoryPostProcessor implements BeanFactoryPostProcessor {
+
+    @Override
+    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
+        Map<String, Object> map = beanFactory.getBeansWithAnnotation(Qualifier.class);
+        for (Map.Entry<String, Object> entry : map.entrySet()) {
+            createInstances(beanFactory, entry.getKey(), entry.getValue());
+        }
+    }
+
+    private void createInstances(ConfigurableListableBeanFactory beanFactory, String beanName, Object bean) {
+        Qualifier qualifier = bean.getClass()
+            .getAnnotation(Qualifier.class);
+        for (String name : extractNames(qualifier)) {
+            Object newBean = beanFactory.getBean(beanName);
+            beanFactory.registerSingleton(name.trim(), newBean);
+        }
+    }
+
+    private String[] extractNames(Qualifier qualifier) {
+        return qualifier.value()
+            .split(",");
+    }
+}
@@ -0,0 +1,11 @@
+package com.baeldung.multibeaninstantiation.solution3;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringApp3 {
+    public static void main(String[] args) {
+        SpringApplication.run(SpringApp3.class, args);
+    }
+}
@@ -0,0 +1,5 @@
+package com.baeldung.springbean.naming.component;
+
+public interface Animal {
+    String name();
+}
@@ -0,0 +1,14 @@
+package com.baeldung.springbean.naming.component;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Component;
+
+@Component
+@Qualifier("cat")
+public class Cat implements Animal {
+
+    @Override
+    public String name() {
+        return "Cat";
+    }
+}
@@ -0,0 +1,7 @@
+package com.baeldung.springbean.naming.component;
+
+import org.springframework.stereotype.Component;
+
+@Component("myBean")
+public class CustomComponent {
+}
@@ -0,0 +1,13 @@
+package com.baeldung.springbean.naming.component;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Component;
+
+@Component
+@Qualifier("dog")
+public class Dog implements Animal {
+    @Override
+    public String name() {
+        return "Dog";
+    }
+}
@@ -0,0 +1,14 @@
+package com.baeldung.springbean.naming.configuration;
+
+import com.baeldung.springbean.naming.service.AuditService;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AuditConfiguration {
+
+    @Bean
+    public AuditService audit() {
+        return new AuditService();
+    }
+}
@@ -0,0 +1,19 @@
+package com.baeldung.springbean.naming.configuration;
+
+import com.baeldung.springbean.naming.component.CustomComponent;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration("configuration")
+public class MyConfiguration {
+
+    @Bean("qualifierComponent")
+    public CustomComponent component() {
+        return new CustomComponent();
+    }
+
+    @Bean("beanComponent")
+    public CustomComponent myComponent() {
+        return new CustomComponent();
+    }
+}
@@ -0,0 +1,12 @@
+package com.baeldung.springbean.naming.controller;
+
+import com.baeldung.springbean.naming.service.MessagingService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+
+@Controller
+public class MessagingController {
+
+    @Autowired
+    private MessagingService service;
+}
@@ -0,0 +1,4 @@
+package com.baeldung.springbean.naming.service;
+
+public class AuditService {
+}
@@ -0,0 +1,7 @@
+package com.baeldung.springbean.naming.service;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class LoggingService {
+}
@@ -0,0 +1,4 @@
+package com.baeldung.springbean.naming.service;
+
+public interface MessagingService {
+}
@@ -0,0 +1,14 @@
+package com.baeldung.springbean.naming.service;
+
+import com.baeldung.springbean.naming.component.CustomComponent;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Service;
+
+@Service
+public class MessagingServiceImpl implements MessagingService {
+
+    @Autowired
+    @Qualifier("qualifierComponent")
+    private CustomComponent customComponent;
+}
@@ -0,0 +1,26 @@
+package com.baeldung.springbean.naming.service;
+
+import com.baeldung.springbean.naming.component.Animal;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Service;
+
+@Service
+public class PetShow {
+
+    @Autowired
+    @Qualifier("dog")
+    private Animal dog;
+
+    @Autowired
+    @Qualifier("cat")
+    private Animal cat;
+
+    public Animal getDog() {
+        return dog;
+    }
+
+    public Animal getCat() {
+        return cat;
+    }
+}