spring-mvc Hibernate 中的自动装配依赖项失败答案

【问题标题】：Autowired dependencies failed in spring-mvc Hibernatespring-mvc Hibernate 中的自动装配依赖项失败
【发布时间】：2015-11-18 10:38:45
【问题描述】：

我尝试使用 Netbeans 在 Spring MVC 和 Hibernate 中运行应用程序。流程是我将 ajax 请求传递给控制器，我得到了在不添加@Autowired 和Dao 的情况下响应jsp 页面（即，从控制器返回字符串的普通方法）。但是在添加@Autowired 注释并调用employeeDao 时，我得到了以下错误（即无法自动装配）。我在 applicationContext.xml(com.demo) 中给出了正确的包，也尝试过但仍然得到同样的错误。谁能帮帮我吗。提前谢谢了.... `

$.ajax({
    type: 'POST',
    url: "getServices",
    data:  {optionsvalue:optionsvalue},
    success: function(data) {
      $("#idServices").html(data);
    },
    error: function(jqXHR, textStatus, errorThrown) {
        alert("Unable to fetch Services");
    }

});

这里是 EmployeeController.java `

@Controller
public class EmployeeController {
   @Autowired
   EmployeeDao employeeDao;

    @RequestMapping(value = "/getServices", method = RequestMethod.POST)
    public @ResponseBody String getServices(HttpServletRequest request){
        List<ProductServices> pdtServices = employeeDao.getAllServices(request.getParameter("optionsvalue")==null?"":request.getParameter("optionsvalue"));
        StringBuilder strBuilder = new StringBuilder();
    int i=0;
        for(ProductServices ps : pdtServices){
     i++;
         strBuilder.append("<td>");
         strBuilder.append("<input type=\"checkbox\" name=\"chkService"+i+" value="+ps.getServices()+">"+ps.getServices()+"<br>");
         strBuilder.append("</td>");
         strBuilder.append("<td>");
         strBuilder.append("<input class=\"form-control col-xs-1\" name=\"accountNo"+i+" id=\"accountNo\" required=\"true\" placeholder=\"Acc no\" type=\"text\">");
         strBuilder.append("</td>");
         strBuilder.append("<td>");
         strBuilder.append("<input class=\"form-control col-xs-1\" name=\"transactionLimit"+i+" id=\"transactionLimit\" required=\"true\" placeholder=\"Transaction limit\" type=\"text\">");
         strBuilder.append("</td>");
         strBuilder.append("</tr>");
        }
    return strBuilder.toString();
    }
 }

这里是EmployeeDao.java

@Repository("employeeDao")
public class EmployeeDaoImpl implements EmployeeDao{
    @Autowired
    private SessionFactory sessionFactory;
    @Autowired
    private Session session;
    public List<ProductServices> getAllServices(String strProductId){
        session = sessionFactory.getCurrentSession();
        Criteria cr = session.createCriteria(ProductServices.class);
        cr.add(Restrictions.eq("productId", strProductId));
        return (List<ProductServices>) cr.list();
    }

   }

这是 applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:jdbc="http://www.springframework.org/schema/jdbc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
              http://www.springframework.org/schema/beans/spring-beans-4.1.xsd 
              http://www.springframework.org/schema/jdbc 
              http://www.springframework.org/schema/jdbc/spring-jdbc-4.1.xsd
              http://www.springframework.org/schema/tx 
              http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
              http://www.springframework.org/schema/context
              http://www.springframework.org/schema/context/spring-context-4.1.xsd
              http://www.springframework.org/schema/mvc
              http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
    <context:property-placeholder location="classpath:application.properties"/>
    <context:component-scan base-package="com.demo.*"/>
    <context:annotation-config/>
    <context:spring-configured/>
    <mvc:annotation-driven/>
    <mvc:resources mapping="/resources/**" location="/resources/"/>
    <!-- Data Source Declaration for Hibernate-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="packagesToScan" value="com.demo.model"/>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.c3p0.min_size">${hibernate.minpool}</prop>
                <prop key="hibernate.c3p0.max_size">${hibernate.maxpool}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
                <prop key="hibernate.format_sql">${hibernate.format_sql}</prop>           
            </props>
        </property>
    </bean>
    <!-- Enable the configuration of transactional behavior based on annotations -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
    <!-- Transaction Manager is defined -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean> 
    <bean id="jspViewResolver"
          class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

我收到这样的错误

Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.demo.dao.employeeDao com.demo.controller.employeeController.employeeDao; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeDao': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.hibernate.Session com.demo.dao.employeeDaoImpl.session; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.hibernate.Session] 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)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    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.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:672)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:547)
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1671)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1485)
    at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:882)
    at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:368)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:610)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2442)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2431)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.demo.dao.employeeDao com.demo.controller.employeeController.employeeDao; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeDao': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.hibernate.Session com.demo.dao.employeeDaoImpl.session; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.hibernate.Session] 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)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    ... 58 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeDao': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.hibernate.Session com.demo.dao.employeeDaoImpl.session; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.hibernate.Session] 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)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1017)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
    ... 60 more
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.hibernate.Session com.demo.dao.employeeDaoImpl.session; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.hibernate.Session] 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)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    ... 71 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.hibernate.Session] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1103)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:963)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
    ... 73 more

【问题讨论】：

如果不知道您的 applicationContext.xml 中有什么，这有点难以看到。但是异常说没有“会话”类对象可以注入。确保 spring 正在初始化这个对象。或者，如果您的 DAO 方法确实应该设置会话本身，请从字段中删除 @Autowired 注释
您好，您的会话是自动装配的，但在“getAllServices”方法中，您使用“session = sessionFactory.getCurrentSession();”设置此属性?那么也许会话属性的自动装配是错误的

标签： java hibernate spring-mvc

【解决方案1】：

只需从 Session 对象中删除 @Autowired 即可。您从会话工厂获取会话。

【讨论】：

【解决方案2】：

从Session 中删除@Autowired，并在方法中声明它

@Repository("employeeDao")
public class EmployeeDaoImpl implements EmployeeDao {
    @Autowired
    private SessionFactory sessionFactory;

    public List<ProductServices> getAllServices(String strProductId) {
        Session session = sessionFactory.getCurrentSession();
        Criteria cr = session.createCriteria(ProductServices.class);
        cr.add(Restrictions.eq("productId", strProductId));
        return (List<ProductServices>) cr.list();
    }

}

【讨论】：

【解决方案3】：

更改以下代码

@Service
public class EmployeeDaoImpl implements EmployeeDao{
    @Autowired
    private SessionFactory sessionFactory;

    @Transactional
    public List<ProductServices> getAllServices(String strProductId){
        Criteria cr = sessionFactory.getCurrentSession().createCriteria(ProductServices.class);
        cr.add(Restrictions.eq("productId", strProductId));
        return (List<ProductServices>) cr.list();
    }

}

这应该可以解决您的问题

【讨论】：

我已经改变了上面的代码，但仍然是同样的异常。