Spring Boot ConflictingBeanDefinitionException：@Controller 的注解指定的 bean 名称 class

Question

我的 Spring 启动应用程序中一直出现 ConflictingBeanDefinitionException 错误。我不完全确定如何解决它，我有几个 @Configuration 注释 classes 帮助设置 Thymeleaf，Spring 安全和 Web。为什么应用程序尝试设置 homeController 两次？（它在哪里尝试这样做？）

错误是：

org.springframework.beans.factory.BeanDefinitionStoreException: 
Failed to parse configuration class [org.kemri.wellcome.hie.Application]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException:
Annotation-specified bean name 'homeController' for bean class [org.kemri.wellcome.hie.HomeController] conflicts with existing, non-compatible bean definition of same name and class [org.kemri.wellcome.hie.controller.HomeController]

我的 spring 引导主应用程序初始化程序：

@EnableScheduling
@EnableAspectJAutoProxy
@EnableCaching
@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
    
    @Override
    protected final SpringApplicationBuilder configure(final SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

}

我的数据库配置文件：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages="org.kemri.wellcome.hie.repositories")
@PropertySource("classpath:application.properties")
public class DatabaseConfig {

  @Autowired
  private Environment env;

  @Autowired
  private DataSource dataSource;

  @Autowired
  private LocalContainerEntityManagerFactoryBean entityManagerFactory;

   @Bean
  public DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName(env.getProperty("spring.datasource.driverClassName"));
    dataSource.setUrl(env.getProperty("spring.datasource.url"));
    dataSource.setUsername(env.getProperty("spring.datasource.username"));
    dataSource.setPassword(env.getProperty("spring.datasource.password"));
    return dataSource;
  }
  @Bean
  public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean entityManagerFactory =
        new LocalContainerEntityManagerFactoryBean();
    
    entityManagerFactory.setDataSource(dataSource);
    
    // Classpath scanning of @Component, @Service, etc annotated class
    entityManagerFactory.setPackagesToScan(
        env.getProperty("spring.jpa.hibernate.entitymanager.packagesToScan"));
    
    // Vendor adapter
    HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    entityManagerFactory.setJpaVendorAdapter(vendorAdapter);
    
    // Hibernate properties
    Properties additionalProperties = new Properties();
    additionalProperties.put(
        "hibernate.dialect", 
        env.getProperty("spring.jpa.hibernate.dialect"));
    additionalProperties.put(
        "hibernate.showsql", 
        env.getProperty("spring.jpa.hibernate.showsql"));
    additionalProperties.put(
        "hibernate.hbm2ddl.auto", 
        env.getProperty("spring.jpa.hibernate.hbm2ddl.auto"));
    entityManagerFactory.setJpaProperties(additionalProperties);
    
    return entityManagerFactory;
  }
  @Bean
  public JpaTransactionManager transactionManager() {
    JpaTransactionManager transactionManager = 
        new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(
        entityManagerFactory.getObject());
    return transactionManager;
  }
  @Bean
  public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
    return new PersistenceExceptionTranslationPostProcessor();
  }

}

我的 Thymeleaf 配置文件：

@Configuration
public class ThymeleafConfig {

@Bean
public ServletContextTemplateResolver templateResolver(){
    ServletContextTemplateResolver thymeTemplateResolver = new ServletContextTemplateResolver();
    thymeTemplateResolver.setPrefix("/WEB-INF/views/");
    thymeTemplateResolver.setSuffix(".html");
    thymeTemplateResolver.setTemplateMode("HTML5");
    return thymeTemplateResolver;
}   

@Bean
public SpringSecurityDialect springSecurityDialect(){
    SpringSecurityDialect dialect = new SpringSecurityDialect();
    return dialect;
}

@Bean
public SpringTemplateEngine templateEngine() {
    SpringTemplateEngine engine = new SpringTemplateEngine();   
    engine.addTemplateResolver(templateResolver());
    Set<IDialect> dialects = new HashSet<IDialect>();
    dialects.add(springSecurityDialect());
    engine.setAdditionalDialects(dialects);     
    return engine;
}

@Bean
public ThymeleafViewResolver thymeleafViewResolver() {
    ThymeleafViewResolver resolver = new ThymeleafViewResolver();
    resolver.setTemplateEngine(templateEngine());
    resolver.setViewClass(ThymeleafTilesView.class);
    resolver.setCharacterEncoding("UTF-8");
    return resolver;
}

}

我的网络配置 class:

@Configuration
@PropertySource("classpath:application.properties")
public class WebConfig extends WebMvcAutoConfigurationAdapter  {
    
    @Autowired
    private Environment env;
    
    @Bean
    public JavaMailSenderImpl javaMailSenderImpl() {
        JavaMailSenderImpl mailSenderImpl = new JavaMailSenderImpl();
        mailSenderImpl.setHost(env.getProperty("smtp.host"));
        mailSenderImpl.setPort(env.getProperty("smtp.port", Integer.class));
        mailSenderImpl.setProtocol(env.getProperty("smtp.protocol"));
        mailSenderImpl.setUsername(env.getProperty("smtp.username"));
        mailSenderImpl.setPassword(env.getProperty("smtp.password"));
        Properties javaMailProps = new Properties();
        javaMailProps.put("mail.smtp.auth", true);
        javaMailProps.put("mail.smtp.starttls.enable", true);
        mailSenderImpl.setJavaMailProperties(javaMailProps);
        return mailSenderImpl;
    }

    @Bean
    public CacheManager cacheManager() {
        return new ConcurrentMapCacheManager();
    }
}

我的控制器（设置控制器时出错）

@Controller
public class HomeController {
    
    private static final Logger logger = LoggerFactory.getLogger(HomeController.class);
    
    /**
     * Simply selects the home view to render by returning its name.
     */
    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String home(Locale locale, Model model) {
        logger.info("Welcome home! The client locale is {}.", locale);
        
        Date date = new Date();
        DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG, locale);
        
        String formattedDate = dateFormat.format(date);
        
        model.addAttribute("serverTime", formattedDate );
        
        return "index.html";
    }
}

什么可能导致我的控制器 class 出现 ConflictingBeanDefinitionException 错误？

Answer 1

您似乎有两个 entityManagerFactory，一个将自动装配，一个将以编程方式解析为 Bean：

@Autowired
private LocalContainerEntityManagerFactoryBean entityManagerFactory;

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
...
}

我认为您只需要在 entityManagerFactory() 方法中配置工厂。

Answer 2

正如我发现的那样，解决方案是通过在组件扫描中包含一个过滤器来禁用双重初始化。就我而言：

@EnableScheduling
@EnableAspectJAutoProxy
@EnableCaching
@Configuration
@ComponentScan(basePackages = { "org.kemri.wellcome.hie" }, 
    excludeFilters = {@Filter(value = Controller.class, type = FilterType.ANNOTATION)})
@EnableAutoConfiguration
@PropertySource("classpath:application.properties")
public class Application extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Answer 3

我在使用 spring-boot 生成的 .war 文件时遇到了同样的问题。批准的解决方案（Timothy Tuti 自己的解决方案）对我来说并没有完全按原样工作，但我稍微调整了一下，它就工作了。我刚刚将以下行添加到我的 Application.java:

@ComponentScan(basePackages = { "com.mypackage" })

作为参考，这里是我的完整 Application.java

package com.inmoment.devchallenge;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.neo4j.config.EnableNeo4jRepositories;
import org.springframework.data.neo4j.config.Neo4jConfiguration;

@SpringBootApplication
@Configuration
@ComponentScan(basePackages = { "com.inmoment.devchallenge.controller" })
@EnableAutoConfiguration
public class Application extends SpringBootServletInitializer {

    @Configuration
    @EnableNeo4jRepositories(basePackages = "com.inmoment.devchallenge.repository")
    static class ApplicationConfig extends Neo4jConfiguration {

        public ApplicationConfig() {
            setBasePackage("com.inmoment.devchallenge.repository");
        }

        @Bean
        GraphDatabaseService graphDatabaseService() {
            return new GraphDatabaseFactory().newEmbeddedDatabase("accessingdataneo4j.db");
        }
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class, args);
    }

}

Answer 4

我运行遇到同样的问题，但出于不同的原因。

如果您在项目中四处移动类而未能执行 'clean'，也会发生这种情况。

我使用 gradle 和 spring-boot 插件。现在我通常运行:

$> ./gradlew clean bootRun

Answer 5

当我使用 InteliJ运行进行 Spring 集成测试 时，我遇到了同样的问题。

重构后，我的一个控制器 class 实际上在 /out/production/classes 目录中是重复的，该目录是自 2017.2 版以来 Intelij 的默认输出目录. 由于 gradle 输出目录不同（它是 build/classes），gradle clean 目标没有效果。

对我来说，解决方案是手动删除 /out/production/classes 并重新运行我的集成测试。

对于没有 2 个输出目录的可能的持久解决方案，请参阅 here

Answer 6

我在更改了几个文件夹名称和相关包名称后使用 mvn 遇到了这个问题。比我应用 maven clean 和运行 spring 再次启动，一切都解决了：

mvn clean
mvn spring-boot:run

Answer 7

我通过在 class.

之上添加一个 bean 名称解决了我的问题

@Component("myBeanName1")
public class MyBean {

}

然后用@Autowire初始化它，这样：

@Autowire
@Qualifier("myBeanName1")
MyBean myBean;

Spring Boot ConflictingBeanDefinitionException：@Controller 的注解指定的 bean 名称 class

Spring Boot ConflictingBeanDefinitionException: Annotation-specified bean name for @Controller class

java

spring

spring-mvc

spring-security

spring-boot