AspectJ和NoSuchBeanDefinitionException至少有一个bean，该bean符合此依赖项的自

Question

我正在尝试使用AspectJ，我的项目工作正常。但是当我尝试使用AspectJ时，注入不能正常工作。如果我不使用AspectJ，它会再次工作。

我包含在我的pom.xml

<dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.6.11</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.11</version>
        </dependency>

配置文件:

   <aop:aspectj-autoproxy />
    <tx:annotation-driven />
    <!-- Database Configuration -->
    <import resource="../database/DataSource.xml"/> 
        <!-- Auto scan the components -->
    <context:component-scan base-package="es.rooms.db.spring.dao" />
    <context:component-scan base-package="es.rooms.util" />
    <!-- Aspect -->
    <bean id="logAspect" class="es.rooms.util.LoggingAspect" />

我正在使用注释到我的类:

@Repository("RoomDAO")
public class RoomDAO extends JdbcDaoSupport implements IRoomDAO{
    @Autowired
    private PlayerDAO playerDAO;

我不知道我是否需要扫描我的AspectJ类，但我还是扫描了。我试图标记为需要=false的PlayerDAO，我可以检查LoggingAspect被调用，但是当RoomDAO要调用PlayerDAO时，我得到了一个NullPointException。为什么我使用AspectJ时不能注入PlayerDAO ?

@Aspect
public class LoggingAspect {

    @Before("execution(* es.rooms.db.spring.dao.*.*(..))")
    public void logBefore(JoinPoint joinPoint) {
        System.out.println("!!!!!!!!!!!!!!logBefore() is running! ->" + joinPoint.getSignature().getName());        
        System.out.println("******");
    }

错误:

04-jun-2013 11:36:46 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@61acfa31: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0,org.springframework.transaction.interceptor.TransactionInterceptor#0,org.springframework.transaction.config.internalTransactionAdvisor,org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0,dataSource,playerDAO,RoomDAO,userDAO,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,manageRooms,messagesGcm,transactionManager,logAspect,org.springframework.context.annotation.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor#0]; root of factory hierarchy
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'RoomDAO': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private es.rooms.db.spring.dao.PlayerDAO es.rooms.db.spring.dao.RoomDAO.playerDAO; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [es.rooms.db.spring.dao.PlayerDAO] 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:287)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1106)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:585)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at es.rooms.server.RoomsServer.<init>(RoomsServer.java:23)
    at es.rooms.server.RoomsServer.main(RoomsServer.java:61)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private es.rooms.db.spring.dao.PlayerDAO es.rooms.db.spring.dao.RoomDAO.playerDAO; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [es.rooms.db.spring.dao.PlayerDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:506)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:284)
    ... 14 more

谢谢。更新:

我修复了添加

<aop:aspectj-autoproxy proxy-target-class="true"/>

但是，我不知道为什么会这样，如果有人能给我解释一下，我很感激。

Answer 1

from http://docs.spring.io/spring/docs/3.1.1.RELEASE/spring-framework-reference/html/aop.html

Spring AOP使用JDK动态代理或CGLIB来创建给定目标对象的代理。(首选JDK动态代理当你有选择的时候)。

如果要代理的目标对象实现了至少一个接口然后使用JDK动态代理。所有的接口由目标类型实现的将被代理。如果目标对象没有实现任何接口，那么CGLIB代理将被创建。

如果您想强制使用CGLIB代理(例如，代理为目标对象定义的每个方法，而不仅仅是那些实现的方法通过它的接口，您可以这样做。…的值来强制使用CGLIB代理将元素的Proxy-target-class属性设置为true:

因此，您已经为所有类打开了CGLIB代理。阅读整页以获得更多信息——这是使用spring AOP的重要背景信息。当您使用CGLIB时会发生一些有趣且不同的事情(所有这些都在上面的链接中有文档说明)—如果可以的话，您最好遵循Spring约定。例如，如果你自定义一个类，给它一个接口和一个空构造函数。

Answer 2

在我使用的一个单元测试中，我错误地得到了相同的错误消息:

@Autowire
ServiceImpl service;

代替

@Autowire
Service service;

(其中ServiceImpl正在实现Service)。在我添加了aop:aspectj-autoproxy