Question

我的控制器类：

@Controller
public class UsersController
{
    @Autowired
    TechRequestService techrequestservices;

@RequestMapping(value="/service_request", method=RequestMethod.POST)
    public @ResponseBody  Map<String,Object> SaveServiceRequest(@Valid Servicerequest servicerequest,BindingResult result){
        Map<String,Object> map = new HashMap<String,Object>();

        Object obj=new Object();
            if(result.hasErrors())
            {  
                for (Object object : result.getAllErrors()) {
                    if(object instanceof FieldError) {
                        FieldError fieldError = (FieldError) object;

                     obj= (fieldError.getDefaultMessage());
                    }
                map.put("status","400");
                map.put("message",obj);
                return map;
            }}
            techrequestservices.save_servicerequest(servicerequest);
            map.put("status","200");
            map.put("message","Your record have been saved successfully"); 
            return map;
            }

}

我的服务实现类：

@Service

    public class TechRequestServiceImpl implements TechRequestService{
        @Autowired
        TechRequestServiceDao techrequestservicedao;

        public boolean save_servicerequest(Servicerequest servicerequest) {
            return techrequestservicedao.save_servicerequest(servicerequest);
        }

        public List<Servicerequest> list() {
            // TODO Auto-generated method stub
            return techrequestservicedao.list();
        }



    }

我的DaoImpl类：

@Repository
@Transactional
public class TechRequestServiceDaoImpl implements TechRequestService {

    @Autowired
SessionFactory session;

    @Override
    public boolean save_servicerequest(Servicerequest servicerequest) {
        // TODO Auto-generated method stub
        session.getCurrentSession().saveOrUpdate(servicerequest);
        return true;
    }

    @Override
    public List<Servicerequest> list() {

            return session.getCurrentSession().createQuery("from Search_type_case").list();

    }
}

通过ajax发出请求，并且通过将打印语句放入pojos的ever setter方法中来确认它，pojo变量正在正确初始化其值。异常的完整堆栈跟踪如下：
SEVERE: Exception sending context initialized event to listener instance of class
[org.springframework.web.context.ContextLoaderListener] org.springframework.beans.factory.BeanCreationException：错误创建名称为“ usersController”的bean：自动接线的注入依赖失败；嵌套异常为 org.springframework.beans.factory.BeanCreationException：无法自动连线栏位：com.servicesapi.TechRequestService com.controllers.UsersController.techrequestservices;嵌套异常是org.springframework.beans.factory.BeanCreationException：错误创建名称为“ techRequestServiceImpl”的bean：注入自动关联依赖项失败；嵌套异常为 org.springframework.beans.factory.BeanCreationException：无法 autowire字段：com.daoapi.TechRequestServiceDao com.servicesimpl.TechRequestServiceImpl.techrequestservicedao;嵌套的例外是 org.springframework.beans.factory.NoSuchBeanDefinitionException：否找到了类型为[com.daoapi.TechRequestServiceDao]的合格Bean 依赖关系：至少需要1个符合自动装配条件的bean 此依赖项的候选者。依赖注释： {@ org.springframework.beans.factory.annotation.Autowired（required = true）} 在 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:334）在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean（AbstractAutowireCapableBeanFactory.java:1214）在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:543）在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:482）在 org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:306）在 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）在 org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302）在 org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:197）在 org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:772）在 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:839）在 org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:538）在 org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext（ContextLoader.java:444）在 org.springframework.web.context.ContextLoader.initWebApplicationContext（ContextLoader.java:326）在 org.springframework.web.context.ContextLoaderListener.contextInitialized（ContextLoaderListener.java:107）在 org.apache.catalina.core.StandardContext.listenerStart（StandardContext.java:4792）在 org.apache.catalina.core.StandardContext.startInternal（StandardContext.java:5256）在 org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150）在 org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1421）在 org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1411）在java.util.concurrent.FutureTask.run（未知来源） java.util.concurrent.ThreadPoolExecutor.runWorker（未知源），位于 java.util.concurrent.ThreadPoolExecutor $ Worker.run（未知源） java.lang.Thread.run（未知来源）

Answer 1

您的Component-Scan是否正确设置为扫描给定路径内的包裹？尝试在component-scan中设置spring xml configuration，以扫描相关的软件包，如下所示：

<context:component-scan base-package="com.main"/>

您的dao，service和controller软件包位于com.main内部的位置。这将在检查bean定义的同时扫描com.main下的所有文件。

Answer 2

TechRequestServiceImpl和TechRequestServiceDaoImpl都实现TechRequestService，因此在上下文中有两个类型为TechRequestService的bean，但没有一个类型为TechRequestServiceDao。要解决：TechRequestServiceDaoImpl应该实现TechRequestServiceDao

即使正确配置了@Autowire和@存储库@服务，也会引发NoSuchBeanDefinitionException

2 个答案: