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[英]Unknown attribute accessExternalDTD while creating Spring bean
[英]Bean unknown with spring
在3.2春季项目中,我在启动应用程序时遇到问题。 系统似乎无法识别某些bean。
我收到此错误:
27-May-2014 12:41:05.879 SEVERE [http-nio-8084-exec-5] org.apache.catalina.core.StandardContext.listenerStart Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'reportResource': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.prjx.domain.ReportFacade com.prjx.web.resources.ReportResource.reportFacade; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.prjx.domain.facade.ReportFacade] 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)}
@Controller
public class ReportResource
{
@Autowired
private UserFacade userFacade;
@Autowired
private ReportFacade reportFacade;
...
}
@Component
public interface ReportFacade{
...
}
public class ReportFacadeImpl implements ReportFacade
{
...
}
在我的application-context.xml中,我有
<context:component-scan base-package="com.prjx" />
我该如何解决?
@Component
public interface ReportFacade{
...
}
永远不能注入依赖,因为它是一个接口。
所以做下面的事情
public interface ReportFacade{
...
}
@Component
public class ReportFacadeImpl implements ReportFacade{
...
}
然后
@Autowired
private ReportFacade reportFacade;
将注入其实现程序ReportFacadeImpl
。
确保springconfig文件中的componentscan具有正确的接口和类包条目。
您尚未为ReportFacade接口定义实现。
春天不是魔术。 它无法读懂你的豆子应该做什么。
因此,您需要创建ReportFacade接口的实现,将其放入Spring扫描的包中,并使用@Component
注释此实现。 接口本身不应具有@Component
批注。
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