Question

我正在尝试自动装配包含@Async方法的bean但是，它失败并出现异常 “注入自动连接的依赖项失败”

我的servlet.xml包含声明

<task:annotation-driven executor="executor" />
<task:executor id="executor" pool-size="7"/>

我可以得到一些帮助，为什么这不能自动装配？

---更新--- 这是错误的堆栈跟踪。

“cancelAppointment”是为MailService bean完成Autowire的bean id

2013-08-14 17:06:46,488|main|DEBUG|org.springframework.beans.factory.support.DisposableBeanAdapter|Invoking destroy() on bean with name 'org.springframework.scheduling.annotation.internalScheduledAnnotationProcessor'
2013-08-14 17:06:46,488|main|DEBUG|org.springframework.beans.factory.support.DisposableBeanAdapter|Invoking destroy() on bean with name 'executor'
2013-08-14 17:06:46,488|main|INFO|org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor|Shutting down ExecutorService
2013-08-14 17:06:46,492|main|ERROR|org.springframework.web.context.ContextLoader|Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cancelAppointment': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.ge.appl.service.fs.manager.email.MailService com.ge.appl.service.fs.manager.cancel.consumer.CancelAppointmentImpl.mailService; nested exception is java.lang.IllegalArgumentException: Can not set com.ge.appl.service.fs.manager.email.MailService field com.ge.appl.service.fs.manager.cancel.consumer.CancelAppointmentImpl.mailService to $Proxy35
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:285)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1074)
    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:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)

------更新2 ------------ 以下是堆栈跟踪的更多细节

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.ge.appl.service.fs.manager.email.MailService com.ge.appl.service.fs.manager.cancel.consumer.CancelAppointmentImpl.mailService; nested exception is java.lang.IllegalArgumentException: Can not set com.ge.appl.service.fs.manager.email.MailService field com.ge.appl.service.fs.manager.cancel.consumer.CancelAppointmentImpl.mailService to $Proxy35
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:502)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:282)
    ... 28 more
Caused by: java.lang.IllegalArgumentException: Can not set com.ge.appl.service.fs.manager.email.MailService field com.ge.appl.service.fs.manager.cancel.consumer.CancelAppointmentImpl.mailService to $Proxy35
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146)
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:150)
    at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
    at java.lang.reflect.Field.set(Field.java:657)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:498)
    ... 30 more

完成autowire的类似乎

@Component("cancelAppointment")
public class CancelAppointmentImpl extends AbstractCancelAppointment implements
    CancelAppointment {


@Autowired
private MailService mailService;



@Override
public CancelAppointmentCriteria cancelAppointment(
        final CancelAppointmentCriteria criteria) throws Exception {
       // do something
       try {                      
            mailService.sendMail();
           } catch (Exception e) {
    // handle exception
 }

} }

Answer 1

我面临同样的问题，我认为@EnableAsync正在使用@Async将任何组件转换为代理实现此组件类使用的相同接口，因此当使用具体类进行autowire时，将面临类型之间的冲突这个具体的类和代理，因为你可以在接口上使用autowire并使用@Qualifier来指定bean。

使用@Async方法不会为bean发生自动装配

1 个答案: