Spring boot - 具有该名称的 bean 已被定义并且覆盖被禁用

Question

我正在构建一个使用 Mongo 数据库存储库的 Spring-Boot 应用程序，定义如下：

package com.example.repository;
import java.util.Optional;

import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;

import com.example..model.UserProfile;

@Repository
public interface UserProfileRepository extends MongoRepository<UserProfile, Double> {
    
    Optional<UserProfile> findByEmail(String email);

    Boolean existsByEmail(String email);
  
}

在没有在任何其他类中导入/自动装配存储库的情况下，当我尝试运行 spring 应用程序时，我立即遇到以下问题：

描述：

无法注册 bean“userProfileRepository”。一颗豆子与 该名称已被定义并且覆盖被禁用。

行动：

考虑重命名其中一个 Bean 或通过设置启用覆盖 spring.main.allow-bean-definition-overriding=true

如果我只是删除存储库类并运行应用程序，一切都很好。

更新：

使用 --debug 运行后的堆栈跟踪

org.springframework.beans.factory.support.BeanDefinitionOverrideException: Invalid bean definition with name 'userProfileRepository' defined in null: Cannot register bean definition [Root bean: class [org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] for bean 'userProfileRepository': There is already [Root bean: class [org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] bound.
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.registerBeanDefinition(DefaultListableBeanFactory.java:927) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.data.repository.config.RepositoryConfigurationDelegate.registerRepositoriesIn(RepositoryConfigurationDelegate.java:175) ~[spring-data-commons-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.data.repository.config.RepositoryBeanDefinitionRegistrarSupport.registerBeanDefinitions(RepositoryBeanDefinitionRegistrarSupport.java:107) ~[spring-data-commons-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.lambda$loadBeanDefinitionsFromRegistrars$1(ConfigurationClassBeanDefinitionReader.java:385) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684) ~[na:1.8.0_231]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromRegistrars(ConfigurationClassBeanDefinitionReader.java:384) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:148) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:120) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:337) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:242) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at com.example.ExampleApplication.main(SpringSocialApplication.java:13) [classes/:na]

Answer 1

basePackages = {"com.abc.searchengine.repo"}

将以上行添加到 yourprojectApplication.java 文件中。请参阅下面的示例：

@SpringBootApplication
@EnableMongoRepositories(basePackages = {"com.abc.searchengine.repo"})
public class SearchEngineApplication {
    public static void main(String[] args) {
        SpringApplication.run(SearchEngineApplication.class, args);
    }
}

Answer 2

当我在配置文件（在我的例子中是 SpringBootApplication 文件）中定义一个类，例如 A 作为 bean(@Bean) 时，出现此错误：

 ....
 public static void main(String[] args) {
    ConfigurableApplicationContext context=SpringApplication.run(RTGApp.class, args);
 ....
 }
 @Bean
 public A a(){
  return new A();
 }
}

并在其自己的 A 文件中放置 @定义上的组件：
@成分
A 类{}
因为@Component包含了@Bean。
因此它被创建了两次。
因此，我必须删除 @Component 注释或整个 @Bean a() 方法