Spring Bean Dependency Missing但是Log和Debug状态被实例化

时间：2016-05-07 15:04:03

标签： java spring dependency-injection spring-boot

我在Spring 4.2.6.RELEASE中使用Spring Boot 1.3.4.RELEASE。

我有以下课程：

@Component
class ServerRunner implements Runnable {

使用构造函数：

 @Autowired
  ServerRunner(@Value(HEARTBEAT_SECONDS) final long secondsBetweenHeartbeats,
               final ServerSocket socket,
               final PlayerRepository playerRepository,
               final DeckProcessor deckProcessor) {
    this.serverSocket = socket;
    this.maintainer = new Maintainer(secondsBetweenHeartbeats);
    this.playerRepository = playerRepository;
    final ExecutorService executorService = newCachedThreadPool();
    executorService.execute(this);
    this.running = true;

    this.deckProcessor = deckProcessor;
    executorService.execute(maintainer);
  }

当我启动应用程序时，它找不到依赖关系DeckProcessor。

@Component
class DeckProcessor extends AbstractPlayerProcessor {
  private final DeckRepository repository;

  @Autowired(required = true)
  DeckProcessor(final DeckRepository repository) {
    super(QUERY_DECKS);
    this.repository = repository;
  }

抛出以下异常：

  23:12:42 ERROR org.springframework.boot.SpringApplication - Application startup failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'serverRunner' defined in file [GameServer\arml-server\build\classes\main\com\arml\services\ServerRunner.class]: Unsatisfied dependency expressed through constructor argument with index 3 of type [com.arml.services.DeckProcessor]: No qualifying bean of type [com.arml.services.DeckProcessor] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.arml.services.DeckProcessor] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:185) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1143) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1046) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) ~[spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
    at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:134) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
    at com.arml.ArmlServer.main(ArmlServer.java:21) [main/:?]
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.arml.services.DeckProcessor] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1373) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1119) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    ... 17 more

但日志明确指出：

16:44:05 DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean deckProcessor
16:44:05 DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating instance of bean deckProcessor
16:44:05 DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Autowiring by type from bean name 'deckProcessor' via constructor to bean named 'deckRepository'
16:44:05 DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Eagerly caching bean 'deckProcessor' to allow for resolving potential circular references
16:44:05 DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Finished creating instance of bean 'deckProcessor'

两个类都位于同一个包中。

我做错了什么？我已经调试好几个小时了，无法找到解决方案。

SpringBoot App：

@EnableJpaRepositories(basePackages = "com.arml.persistence.repositories")
@EnableTransactionManagement
@SpringBootApplication
public class ArmlServer {

  public static void main(final String[] args) {
    new SpringApplicationBuilder()
        .web(false)
        .bannerMode(OFF)
        .sources(ArmlServer.class)
        .run(args);
  }
}

配置：

@Configuration
public class ArmlConfiguration {
  private static final Base64.Decoder DECODER = getDecoder();

  @Bean
  public ServerSocket armlSslSocket(@Value("${arml.server.bind-address}") final String bindAddress,
                                    @Value("${arml.server.port}") final int port,
                                    @Value("${arml.ssl.password}") final String password)
      throws IOException {
    final String keyPass = new String(DECODER.decode(password), UTF_8);
    return createServerSocket(bindAddress, port, keyPass);
  }

  @Bean
  public DataSource dataSource(final DataSourceProperties dataSourceProperties)
      throws PropertyVetoException {
    final ComboPooledDataSource dataSource = new ComboPooledDataSource();
    dataSource.setDriverClass(dataSourceProperties.getDriverClassName());
    dataSource.setUser(dataSourceProperties.getUsername());
    dataSource.setPassword(new String(DECODER.decode(dataSourceProperties.getPassword()), UTF_8));
    dataSource.setJdbcUrl(dataSourceProperties.getUrl());
    return dataSource;
  }
}

编辑： Project Structure

Edit2：我确实试过了@Gemini Keith的建议。 ServerRunner现在看起来像这样（为了简洁，我删除了一些常量/方法）：

@Component
@DependsOn("deckProcessor")
class ServerRunner implements Runnable {    

  @Value(HEARTBEAT_SECONDS)
  private long secondsBetweenHeartbeats;
  private Maintainer maintainer;
  @Autowired
  private ServerSocket serverSocket;
  @Autowired
  private PlayerRepository playerRepository;
  @Autowired
  private DeckProcessor deckProcessor;

  ServerRunner() {
  }

  @PostConstruct
  void init() {
    this.maintainer = new Maintainer(secondsBetweenHeartbeats);
    final ExecutorService executorService = newCachedThreadPool();
    executorService.execute(this);
    this.running = true;

    executorService.execute(maintainer);
  }

但例外仍然存在：

07:12:36 ERROR org.springframework.boot.SpringApplication - Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverRunner': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.arml.services.DeckProcessor com.arml.services.ServerRunner.deckProcessor; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.arml.services.DeckProcessor] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) ~[spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
    at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:134) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
    at com.arml.ArmlServer.main(ArmlServer.java:20) [main/:?]
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.arml.services.DeckProcessor com.arml.services.ServerRunner.deckProcessor; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.arml.services.DeckProcessor] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    ... 15 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.arml.services.DeckProcessor] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1373) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1119) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    ... 15 more

我还重新检查了注释，它们是：

import org.springframework.stereotype.Component;

删除deckProcessor后，构造函数注入工作正常。这真令人困惑！

EDIT3： 我是个白痴。该参数应该具有接口类型。将构造函数更改为：

  @Autowired
  ServerRunner(@Value(HEARTBEAT_SECONDS) final long secondsBetweenHeartbeats,
               final ServerSocket armlSslSocket,
               final PlayerRepository playerRepository,
               final Processor<ServerClientHandler> deckProcessor) {
    this.serverSocket = armlSslSocket;
    this.maintainer = new Maintainer(secondsBetweenHeartbeats);
    this.playerRepository = playerRepository;
    final ExecutorService executorService = newCachedThreadPool();
    executorService.execute(this);
    this.running = true;

    this.deckProcessor = deckProcessor;
    executorService.execute(maintainer);
  }

工作正常。

1 个答案:

答案 0 :(得分：0)

这似乎是初始化依赖性问题。请尝试将@DependsOn与@Component课程ServerRunner一起使用，如下所示：

@DependsOn(value = "deckProcessor")
@Component

value表示DeckProcessor的bean名称，默认情况下始终为deckProcessor。但是，您可以通过在@Component(value = 'nameOfYourBean')指定名称来命名。

在你的情况下，你的构造函数需要自动装配DeckProcessor，这对于实例化ServerRunner bean来说太严格了，这意味着当DeckProcessor ServerRunner时必须有ServerRunner bean正在创建。否则，ServerRunner无法实例化。但是，您可以通过创建@PostConstruct方法初始化@Value(HEARTBEAT_SECONDS) long secondsBetweenHeartbeats; @Autowired ServerSocket socket; @Autowired PlayerRepository playerRepository; @Autowired DeckProcessor deckProcessor; @PostConstruct public void init() { this.serverSocket = socket; this.maintainer = new Maintainer(secondsBetweenHeartbeats); this.playerRepository = playerRepository; final ExecutorService executorService = newCachedThreadPool(); executorService.execute(this); this.running = true; this.deckProcessor = deckProcessor; executorService.execute(maintainer); } 并将代码从构造函数移动到其中。如：

<%= f.select :some_attr, {}, {}, {class: 'my-class'} do %>
  <% MYOPTIONS.each do |MYOPTION| do %>
    <%= content_tag :option, MYOPTION.label, value: MYOPTION.value %>
  <% end %>
<% end %>

此时，spring可以实例化所有bean，然后继续逐个初始化它们。它应该工作。

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