創建新的Controller之后，我在Spring MVC中遇到“自動連接依賴項注入失敗”的問題，Hibernate

Question

我在我的spring mvc項目中添加了一個新的控制器並添加了所有注釋，如下所示……但是在運行項目時，我遇到了404異常，而在控制台中卻出現了如下異常……我很困惑找出問題...

這是我的控制器：

@Controller
@RequestMapping("/escProjectProgStatusController")
public class ESCProjectProgStatusController {
    @Autowired
    ESCProjectProgStatusService escProjectProgStatusService;   
@RequestMapping(value = "/fetchUnitNameDropDown")
    public @ResponseBody String fetchUnitNameDropDown(HttpServletRequest request){
        String strUnitNames = "";
        String strProjectId = request.getParameter("projectId")==null?"":request.getParameter("projectId");
        try {
            strUnitNames = escProjectProgStatusService.fetchUnitNameFromProjectId(strProjectId);
        } catch (Exception e) {  
            //logger.error(e);
            throw e;
        }
        return strUnitNames.toString();
    }
}

服務Impl：

@Service("escProjectProgStatusServices")
@Transactional
public class ESCProjectProgStatusServiceImpl implements ESCProjectProgStatusService {

    @Autowired
    ESCProjectProgStatusDao escProjectProgStatusDao;
@Override
    public String fetchUnitNameFromProjectId(String strProjectId){
        JSONArray jsonArr = new JSONArray();
        JSONObject jsonObj = null;
        List<ProjectUnit> listProjectUnit = null;
        try{
            listProjectUnit = (List<ProjectUnit>)escProjectProgStatusDao.fetchUnitNameFromProjectId(strProjectId);
            if(listProjectUnit!=null){
                for(ProjectUnit projectUnit :listProjectUnit){
                    jsonObj = new JSONObject();
                    jsonObj.put("unitType", projectUnit.getUnitType());
                    jsonObj.put("unitName", projectUnit.getUnitName());
                    jsonArr.add(jsonObj);
                }
            }
        }catch(Exception e){
            //logger.error(e);
        }
        return jsonArr.toString();
    }
}

Dao Impl：

@Repository("escProjectProgStatusDao")
public class ESCProjectProgStatusDaoImpl implements ESCProjectProgStatusDao {
    @Autowired
    private SessionFactory sessionFactory;
@Override
    public List<ProjectUnit> fetchUnitNameFromProjectId(String strProjectId){
        List<ProjectUnit> listProjectUnit = null;
        try {
            Session session = sessionFactory.getCurrentSession();
            Criteria criteria = session.createCriteria(ProjectUnit.class);
            criteria.add(Restrictions.eq("merchantProductID", strProjectId));
            listProjectUnit=criteria.list();
        }catch(Exception e){
            //logger.error(e);
        }
        return listProjectUnit;
    }
}

異常和堆棧跟蹤：

 SEVERE: 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 'ESCProjectProgStatusController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.interland.b2b.service.ESCProjectProgStatusService com.interland.b2b.controller.ESCProjectProgStatusController.escProjectProgStatusService; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert value of type 'java.lang.String' to required type 'com.interland.b2b.service.ESCProjectProgStatusService'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [com.interland.b2b.service.ESCProjectProgStatusService]: no matching editors or conversion strategy found
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1208)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:759)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
        at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:434)
        at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
        at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
    Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.interland.b2b.service.ESCProjectProgStatusService com.interland.b2b.controller.ESCProjectProgStatusController.escProjectProgStatusService; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert value of type 'java.lang.String' to required type 'com.interland.b2b.service.ESCProjectProgStatusService'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [com.interland.b2b.service.ESCProjectProgStatusService]: no matching editors or conversion strategy found
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
        at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
        ... 22 more
    Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert value of type 'java.lang.String' to required type 'com.interland.b2b.service.ESCProjectProgStatusService'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [com.interland.b2b.service.ESCProjectProgStatusService]: no matching editors or conversion strategy found
        at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:74)
        at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:54)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:961)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
        ... 24 more
    Caused by: java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [com.interland.b2b.service.ESCProjectProgStatusService]: no matching editors or conversion strategy found
        at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:287)
        at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:124)
        at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:61)
        ... 28 more

任何人都可以幫助我擺脫這個問題。。在此先感謝...。

Answer 1

在ESCProjectProgStatusServiceImpl類中，刪除@Service注釋的String參數：

之前：

@Service("escProjectProgStatusServices")

后：

@Service