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Ralf Ueberfuhr
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BAEL-9294: Add sample for BeanRegistrar with Spring 7
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‎spring-boot-modules/pom.xml

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<module>spring-boot-brave</module>
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<module>spring-boot-simple</module>
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<module>spring-boot-http2</module>
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<module>spring-boot-4</module>
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</modules>
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<build>

‎spring-boot-modules/spring-boot-4/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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>spring-boot-4</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>spring-boot-4</name>
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<description>Demo project for Spring Boot</description>
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<parent>
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<groupId>com.baeldung.spring-boot-modules</groupId>
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<artifactId>spring-boot-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-devtools</artifactId>
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<scope>runtime</scope>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-configuration-processor</artifactId>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.mapstruct</groupId>
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<artifactId>mapstruct</artifactId>
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<version>${mapstruct.version}</version>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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</dependency>
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</dependencies>
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<profiles>
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<profile>
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<id>default</id>
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<activation>
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<activeByDefault>true</activeByDefault>
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</activation>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<configuration>
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<mainClass>com.baeldung.virtualthreads.VirtualThreadsApp</mainClass>
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<excludes>
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<exclude>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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</exclude>
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</excludes>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</profile>
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<profile>
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<id>integration</id>
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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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<configuration>
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<!-- Force sequential test execution -->
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<parallel>none</parallel>
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<forkCount>1</forkCount>
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<reuseForks>false</reuseForks>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</profile>
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</profiles>
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<build>
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<pluginManagement>
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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-compiler-plugin</artifactId>
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<configuration>
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<annotationProcessorPaths>
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<path>
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<groupId>org.mapstruct</groupId>
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<artifactId>mapstruct-processor</artifactId>
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<version>${mapstruct.version}</version>
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</path>
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<path>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>${lombok.version}</version>
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</path>
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<!-- This is needed when using Lombok 1.18.16 and above -->
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<path>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok-mapstruct-binding</artifactId>
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<version>${lombok-mapstruct-binding.version}</version>
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</path>
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</annotationProcessorPaths>
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</configuration>
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</plugin>
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</plugins>
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</pluginManagement>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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<repositories>
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<repository>
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<id>repository.spring.milestone</id>
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<name>Spring Snapshot Repository</name>
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<url>https://repo.spring.io/milestone</url>
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</repository>
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<repository>
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<id>repository.spring.snapshot</id>
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<name>Spring Snapshot Repository</name>
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<url>https://repo.spring.io/snapshot</url>
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<snapshots>
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<enabled>true</enabled>
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<updatePolicy>daily</updatePolicy>
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</snapshots>
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</repository>
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</repositories>
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<pluginRepositories>
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<pluginRepository>
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<id>repository.spring.milestone.plugins</id>
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<name>Spring Snapshot Repository</name>
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<url>https://repo.spring.io/milestone</url>
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</pluginRepository>
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<pluginRepository>
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<id>repository.spring.snapshot.plugins</id>
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<name>Spring Snapshot Repository</name>
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<url>https://repo.spring.io/snapshot</url>
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<snapshots>
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<enabled>true</enabled>
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<updatePolicy>daily</updatePolicy>
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</snapshots>
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</pluginRepository>
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</pluginRepositories>
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<properties>
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<mapstruct.version>1.6.3</mapstruct.version>
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<spring-boot.version>4.0.0-SNAPSHOT</spring-boot.version>
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<logback.version>1.5.18</logback.version>
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<lombok-mapstruct-binding.version>0.2.0</lombok-mapstruct-binding.version>
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</properties>
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</project>

‎spring-boot-modules/spring-boot-4/src/main/java/com/baeldung/spring/beanregistrar/BeanRegistrationsConfiguration.java

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package com.baeldung.spring.beanregistrar;
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import org.springframework.beans.factory.BeanRegistrar;
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import org.springframework.beans.factory.BeanRegistry;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.context.annotation.Import;
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import org.springframework.core.env.Environment;
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@ConditionalOnProperty(name = "application.registration-v7", havingValue = "true", matchIfMissing = true)
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@Configuration
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@Import(BeanRegistrationsConfiguration.MyBeanRegistrar.class)
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public class BeanRegistrationsConfiguration {
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static class MyBeanRegistrar implements BeanRegistrar {
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@Override
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public void register(BeanRegistry registry, Environment env) {
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registry.registerBean("myService", MyService.class);
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registry.registerBean("service2", MyService.class, spec -> spec.prototype()
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.lazyInit()
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.primary());
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}
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}
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}

‎spring-boot-modules/spring-boot-4/src/main/java/com/baeldung/spring/beanregistrar/BeanRegistrationsSpring6Configuration.java

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package com.baeldung.spring.beanregistrar;
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import org.springframework.beans.BeansException;
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import org.springframework.beans.factory.config.BeanDefinition;
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import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
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import org.springframework.beans.factory.support.BeanDefinitionRegistry;
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import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
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import org.springframework.beans.factory.support.GenericBeanDefinition;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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@ConditionalOnProperty(name = "application.registration-v7", havingValue = "false")
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@SuppressWarnings("NullableProblems")
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@Configuration
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public class BeanRegistrationsSpring6Configuration {
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@Bean
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BeanDefinitionRegistryPostProcessor beanDefinitionRegistryPostProcessor() {
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return new BeanDefinitionRegistryPostProcessor() {
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@Override
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public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
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var beanDefinition = new GenericBeanDefinition();
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beanDefinition.setBeanClass(MyService.class);
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beanDefinition.setScope(BeanDefinition.SCOPE_SINGLETON);
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registry.registerBeanDefinition("myService", beanDefinition);
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}
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@Override
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public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
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// No-op
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}
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};
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}
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}

‎spring-boot-modules/spring-boot-4/src/main/java/com/baeldung/spring/beanregistrar/MyService.java

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package com.baeldung.spring.beanregistrar;
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public class MyService {
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}

‎spring-boot-modules/spring-boot-4/src/main/java/com/baeldung/spring/beanregistrar/SampleApplication.java

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

‎spring-boot-modules/spring-boot-4/src/test/java/com/baeldung/spring/beanregistrar/BeanRegistrarIntegrationTest.java

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package com.baeldung.spring.beanregistrar;
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import static org.assertj.core.api.Assertions.assertThat;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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@SpringBootTest
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class BeanRegistrarIntegrationTest {
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@Autowired
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MyService myService;
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@Test
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void whenRunningPlatform_thenRegisterBean() {
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assertThat(myService).isNotNull();
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}
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}

‎spring-boot-modules/spring-boot-4/src/test/java/com/baeldung/spring/beanregistrar/BeanRegistrationsSpring6IntegrationTest.java

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package com.baeldung.spring.beanregistrar;
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import static org.assertj.core.api.Assertions.assertThat;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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@SpringBootTest(properties = "application.registration-v7=false")
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class BeanRegistrationsSpring6IntegrationTest {
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@Autowired
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MyService myService;
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@Test
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void whenRunningPlatform_thenRegisterBean() {
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assertThat(myService).isNotNull();
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}
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}

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