@EnableAsync annotation metadata was not injected

【問題描述】

　　@EnableAsync annotation metadata was not injected

　　spring配置初始化時候報錯

　　nested exception is java.lang.IllegalArgumentException:@EnableAsync annotation metadata was not injected

　　詳情信息以下：

 1 警告: Exception encountered during context initialization - cancelling refresh attempt  
 2 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.context.annotation.internalAsyncAnnotationProcessor' defined in org.springframework.scheduling.annotation.ProxyAsyncConfiguration: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.scheduling.annotation.AsyncAnnotationBeanPostProcessor]: Factory method 'asyncAdvisor' threw exception; nested exception is java.lang.IllegalArgumentException: @EnableAsync annotation metadata was not injected  
 3     at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599)  
 4     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1119)  
 5     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1014)  
 6     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)  
 7     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)  
 8     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)  
 9     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)  
10     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)  
11     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)  
12     at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:220)  
13     at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:615)  
14     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:465)  
15     at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:434)  
16     at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)  
17     at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)  
18     at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:782)  
19     at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:424)  
20     at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:774)  
21     at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:249)  
22     at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1242)  
23     at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:717)  
24     at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:494)  
25     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)  
26     at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)  
27     at org.eclipse.jetty.server.Server.doStart(Server.java:282)  
28     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)  
29     at net.sourceforge.eclipsejetty.starter.embedded.JettyEmbeddedAdapter.start(JettyEmbeddedAdapter.java:67)  
30     at net.sourceforge.eclipsejetty.starter.common.AbstractJettyLauncherMain.launch(AbstractJettyLauncherMain.java:84)  
31     at net.sourceforge.eclipsejetty.starter.embedded.JettyEmbeddedLauncherMain.main(JettyEmbeddedLauncherMain.java:42)  
32 Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.scheduling.annotation.AsyncAnnotationBeanPostProcessor]: Factory method 'asyncAdvisor' threw exception; nested exception is java.lang.IllegalArgumentException: @EnableAsync annotation metadata was not injected  
33     at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189)  
34     at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)  
35     ... 28 more  
36 Caused by: java.lang.IllegalArgumentException: @EnableAsync annotation metadata was not injected  
37     at org.springframework.util.Assert.notNull(Assert.java:112)  
38     at org.springframework.scheduling.annotation.ProxyAsyncConfiguration.asyncAdvisor(ProxyAsyncConfiguration.java:45)  
39     at org.springframework.scheduling.annotation.ProxyAsyncConfiguration

【問題緣由】

　　問題出現位置：applicationContext.xml　　

<!-- 配置component所在的包，自動加載須要管理的Bean -->
<context:component-scan base-package="*"></context:component-scan>

　　在上述配置代碼行中，若是使用 * 掃描所有的包會出現此異常，該異常出現的緣由爲掃描到的包包括框架的內部包，致使包發生同名衝突問題。

【解決方法】

　　在該配置給出具體的掃描包範圍，例如：

<!-- 配置component所在的包，自動加載須要管理的Bean -->
<context:component-scan base-package="Data.*,DaoContract,Service,ServiceContract"></context:component-scan>

　　該問題便可解決！