java - 如何修复 org.springframework.beans.factory.BeanCreationException

Question

我有一个 Java Spring MVC Web 应用程序。现在我有以下 Controller 类:

@Controller
@RequestMapping("module/car")
public class CrentalCarController 
{
@Autowired
@Qualifier("restClientService")
private RESTClientService  restClientService;

//the remaining codes
}

我有另一个界面如下:

public interface RESTClientService
{
}

还有一个实现上述接口(interface)的类。该接口(interface)位于另一个项目中，该项目作为依赖项添加到包含我在开头提到的 Controller 的项目中。一旦我添加了

@Autowired
    @Qualifier("restClientService")
    private RESTClientService  restClientService;

对于我的 Controller ，我在控制台中收到以下错误:

 ERROR o.s.web.context.ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'crentalCarController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.smartwcm.commons.rest.RESTClientService com.smartwcm.admin.crental.CrentalCarController.restClientService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.smartwcm.commons.rest.RESTClientService] 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), @org.springframework.beans.factory.annotation.Qualifier(value=restClientService)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) ~[spring-beans-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202) ~[spring-beans-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) ~[spring-beans-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) ~[spring-beans-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) ~[spring-beans-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) ~[spring-beans-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) ~[spring-beans-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:762) ~[spring-beans-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) ~[spring-context-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) ~[spring-context-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106) [spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4720) [catalina.jar:8.0.18]
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5154) [catalina.jar:8.0.18]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [catalina.jar:8.0.18]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409) [catalina.jar:8.0.18]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1399) [catalina.jar:8.0.18]
    at java.util.concurrent.FutureTask.run(Unknown Source) [na:1.8.0_31]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_31]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_31]
    at java.lang.Thread.run(Unknown Source) [na:1.8.0_31]

我无法弄清楚确切的问题，我不确定我是否在这里做错了什么。

Answer 1

com.smartwcm.commons.rest.RESTClientService

这个bean没有映射到任何地方..将其添加到您的配置 xml 中或者尝试:

@Component
public interface RESTClientService
    {
    }

另外..如果您没有同一 bean 的多个声明，那么您不需要 Qualifier 注释..有关更多信息，请参阅:http://www.tutorialspoint.com/spring/spring_qualifier_annotation.htm