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社区首页 >问答首页 >缺少Spring依赖项但日志和调试状态已被实例化

问缺少Spring依赖项但日志和调试状态已被实例化
EN

Stack Overflow用户
提问于 2016-05-07 15:04:03
回答 1查看 1.7K关注 0票数 2

我使用SpringBoot1.3.4.RELEASE和Spring4.2.6.RELEASE。

我有以下课程：

代码语言：javascript
复制
@Component
class ServerRunner implements Runnable {

与Constructor：

代码语言：javascript
复制
 @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);
  }

当我启动我的应用程序时，它找不到依赖DeckProcessor。

代码语言：javascript
复制
@Component
class DeckProcessor extends AbstractPlayerProcessor {
  private final DeckRepository repository;

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

引发以下异常：

代码语言：javascript
复制
  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：

代码语言：javascript
复制
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'

两个类驻留在同一个包中。

我做错了什么？我已经调试了几个小时了，一直找不到解决方案。

SpringBoot应用程序：

代码语言：javascript
复制
@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：

代码语言：javascript
复制
@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：项目结构

Edit2:我确实尝试过@Gemini的建议。ServerRunner现在看起来如下(为了简洁起见，我移除了一些常量/方法)：

代码语言：javascript
复制
@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);
  }

但例外情况仍然是：

代码语言：javascript
复制
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：

代码语言：javascript
复制
import org.springframework.stereotype.Component;

一旦我移除deckProcessor，构造函数注入就能工作。真让人费解！

Edit3:我是个白痴。参数应该具有接口类型。将构造函数更改为：

代码语言：javascript
复制
  @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);
  }

效果很好。

dependency-injection
spring-boot
java
spring
EN

回答 1

Stack Overflow用户

回答已采纳

发布于 2016-05-08 00:49:46

这似乎是一个初始化依赖问题。请尝试将@DependsOn与@Component一起用于ServerRunner类，如下所示：

代码语言：javascript
复制
@DependsOn(value = "deckProcessor")
@Component

value是指DeckProcessor的bean名称，默认情况下它总是deckProcessor。但是，可以通过在@Component(value = 'nameOfYourBean')上指定名称来命名它。

在您的示例中，您的构造函数需要自动生成一个DeckProcessor，这对于实例化ServerRunner bean来说太严格了，这意味着在创建ServerRunner时必须有一个ServerRunner bean。否则，无法实例化ServerRunner。但是，您可以通过创建一个ServerRunner方法来初始化@PostConstruct，并将代码从构造函数移到它中。例如：

代码语言：javascript
复制
@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);
}

此时，spring可以实例化所有bean，然后继续逐个初始化它们。应该管用的。

票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/37090075

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