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Spring Boot ConflictingBeanDefinitionException:@Controller 的注释指定的 bean 名称 class

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

我的 Spring 引导应用程序中不断出现ConflictingBeanDefinitionException错误。 我不完全确定如何解决它,我有几个@Configuration注释类帮助设置 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 Web 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controller(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 controller class 出现ConflictingBeanDefinitionException错误?

我遇到了同样的问题,但出于不同的原因。

如果您在项目中移动类并且未能进行“清理”,也会发生这种情况。

我将 gradle 与 spring-boot 插件一起使用。 现在我通常运行:

$> ./gradlew clean bootRun

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

重构后,我的一个控制器类实际上在/out/production/classes目录中重复,这是自 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。

有关没有 2 个输出目录的可能持久解决方案,请参见此处

正如我发现的,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);
    }
}

在更改了几个文件夹名称和相关包名称后,我在 mvn 中遇到了这个问题。 比我应用 maven clean 并再次运行 spring boot,都解决了:

mvn clean
mvn spring-boot:run

似乎您有两个 entityManagerFactory,一个您将自动装配,另一个您以编程方式解析为 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。

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)对我来说并不完全适用,但我稍微调整了一下,它起作用了。 我刚刚在我的 Application.java 中添加了以下行:

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

作为参考,这是我完整的 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);
    }

}

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 {

}

并以这种方式使用@Autowire初始化它:

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

让我们假设您的 package 名称 - com.example.company和 class 名称是RestExceptionHandler 然后你需要添加与 package 相同的全名。

添加注解@Component("com.example.company.RestExceptionHandler")

它将识别您的 class 而不会发生冲突。

当当前模块(比如 X)的一个依赖项(比如模块 Y)也定义了相同的 class 时,我遇到了同样的问题。所以我不得不创建一个单独的模块(比如 Z)来存储公共类,然后添加对 Z 的依赖供 X 和 Y 使用。

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