Spring mvc Spring3MVC:@Transactional已添加到服务类，现在出现异常_Spring Mvc_Transactions_Annotations

Spring mvc Spring3MVC:@Transactional已添加到服务类，现在出现异常

spring-mvc transactions

Spring mvc Spring3MVC:@Transactional已添加到服务类，现在出现异常,spring-mvc,transactions,annotations,Spring Mvc,Transactions,Annotations,我对spring和java非常陌生。我一直在使用springsource.org来尝试创建一个spring3mvcweb应用程序。我有它的工作，我可以抓取信息，并显示它的控制器和经理现在我正在开发编辑信息并将其保存回数据库的功能。我在服务类中的save函数中添加了@Transactional注释，现在我收到了一个未满足的PendencyException。由于非常新，我不知道该怎么做才能清除它。我为EventsManager添加了一个bean，但我不认为这是必要的，因为注释可以消除对大量xml

我对spring和java非常陌生。我一直在使用springsource.org来尝试创建一个spring3mvcweb应用程序。我有它的工作，我可以抓取信息，并显示它的控制器和经理

现在我正在开发编辑信息并将其保存回数据库的功能。我在服务类中的save函数中添加了

@Transactional

注释，现在我收到了一个

未满足的PendencyException

。由于非常新，我不知道该怎么做才能清除它。我为EventsManager添加了一个bean，但我不认为这是必要的，因为注释可以消除对大量xml配置文件的需要。我不确定错误在哪里，所以我发布了我的源代码。谢谢你花时间帮我解决问题

完全例外：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eventsController' defined in file [$Path\gov\mt\dphhs\epts\web\EventsController.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [gov.mt.dphhs.epts.services.EventsManager]: : No matching bean of type [gov.mt.dphhs.epts.services.EventsManager] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [gov.mt.dphhs.epts.services.EventsManager] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}

控制器类：

@Controller
public class EventsController {

    private EventsManager eventsManager;

    @Autowired
    public EventsController(EventsManager eventsManager){
        this.eventsManager = eventsManager;
    }

    @RequestMapping("/events/events")
    public String displayEvents(ModelMap map){

        map.addAttribute("allEvents", eventsManager.getAllEvents());

        int totalEvents = eventsManager.getAllEvents().size();
        map.addAttribute("totalEvents",totalEvents);

        map.addAttribute("eventsTitle" , totalEvents + " Events");

        return "events";
    }

    @RequestMapping("/events/eventForm")
    public String editEvents(@RequestParam("id") Long eventId, ModelMap map){

        Events event = eventsManager.getEventById(eventId);
        map.addAttribute("pageTitle" , "Edit Event");
        map.addAttribute("event",event);

        return "eventForm";
    }

    @RequestMapping("/events/newEvent")
    public String newEvent(ModelMap map){

        Events event = new Events();
        map.addAttribute("pageTitle" , "New Event");
        map.addAttribute("event",event);

        return "eventForm";
    }

    @RequestMapping("/events/submitEvent")
    public String handleEventForm(@ModelAttribute("event")
            Events event, BindingResult result){

        System.out.println("Event Name:" + event.getEventName() + " ID: " + event.getEvntId());

        if(event.getEvntId() == null)
        {
            eventsManager.save(event);
        }

        return "redirect:/events/events";
    }   
}

服务类别：

@Service("EventsManager")
public class EventsManager implements IEventsManager {


    private EventsDAO eventsDao;

    @Autowired
    public void EventsDAO(EventsDAO eventsDao) {
        this.eventsDao = eventsDao;
    }

    public List<Events> getAllEvents() {
        return eventsDao.findAll();
    }

    public Events getEventById(Long id) {

        return eventsDao.findById(id);
    }

    public void delete(Events event) {
        // TODO Auto-generated method stub

    }

    @Transactional
    public void save(Events event) {
        eventsDao.save(event);
    }

    public Events update(Events event) {

        return eventsDao.update(event);
    }

}

应用程序上下文：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
                    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                    http://www.springframework.org/schema/context
                    http://www.springframework.org/schema/context/spring-context-3.0.xsd 
                    http://www.springframework.org/schema/tx 
                    http://www.springframework.org/schema/tx/spring-tx.xsd">

<context:component-scan base-package="gov.mt.dphhs.epts" />

<bean id="viewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/" />
    <property name="suffix" value=".jsp" />
</bean>

<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
    <property name="persistenceUnitName" value="EPTSTest3Pu" />
</bean>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />
<context:annotation-config />

<bean id="EventsManager" class="gov.mt.dphhs.epts.services.EventsManager" />

<bean id="SpecialGuestsDAO" class="gov.mt.dphhs.epts.repository.SpecialGuestsDAO" />

<bean id="GroupMembersDAO" class="gov.mt.dphhs.epts.repository.GroupMembersDAO" />

<bean id="GroupsDAO" class="gov.mt.dphhs.epts.repository.GroupsDAO" />

<bean id="EventNotificationsDAO" class="gov.mt.dphhs.epts.repository.EventNotificationsDAO" />

<bean id="EventListingsDAO" class="gov.mt.dphhs.epts.repository.EventListingsDAO" />

<bean id="EventGroupXrefDAO" class="gov.mt.dphhs.epts.repository.EventGroupXrefDAO" />

<bean id="EventsDAO" class="gov.mt.dphhs.epts.repository.EventsDAO" />

看起来autowire注释有点混乱，但我不能确定

您在EventsController中声明的依赖关系是对具体EventsManager类的依赖，而不是对接口IEventsManager的依赖，这是更好的做法，即代码到接口。Spring使用一些智能自动连接bean，比如按类型自动连接和按名称自动连接。例如（我正在简化），spring将检查bean容器中是否有匹配的类型或名称。我本可以假设“按类型自动连接”与具体类型一起工作，但这里可能会出现一些特殊情况

我建议：

在您的应用程序中使用IEventsManager 控制器，并声明该类型构造函数参数中的依赖项
用小写字母命名Springbean，就像java字段/变量命名约定一样（然后spring可以通过名称自动连接，将“eventsManager”构造函数参数与“eventsManager”Springbean匹配）

另外，看起来您两次指定了一些bean。当您使用@Service注释并对该包进行组件扫描时，无需在上下文文件中再次指定它。因此，您的“EventsManager”bean已经定义了两次，但我不确定这是否会导致您的依赖性问题。

看起来autowire注释变得混乱，但我不能确定

我建议：

在您的应用程序中使用IEventsManager 控制器，并声明该类型构造函数参数中的依赖项
用小写字母命名Springbean，就像java字段/变量命名约定一样（然后spring可以通过名称自动连接，将“eventsManager”构造函数参数与“eventsManager”Springbean匹配）

看看这个问题。我想你可能也有同样的问题看看这个问题。我想你可能也有同样的问题

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
                    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                    http://www.springframework.org/schema/context
                    http://www.springframework.org/schema/context/spring-context-3.0.xsd 
                    http://www.springframework.org/schema/tx 
                    http://www.springframework.org/schema/tx/spring-tx.xsd">

<context:component-scan base-package="gov.mt.dphhs.epts" />

<bean id="viewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/" />
    <property name="suffix" value=".jsp" />
</bean>

<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
    <property name="persistenceUnitName" value="EPTSTest3Pu" />
</bean>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />
<context:annotation-config />

<bean id="EventsManager" class="gov.mt.dphhs.epts.services.EventsManager" />

<bean id="SpecialGuestsDAO" class="gov.mt.dphhs.epts.repository.SpecialGuestsDAO" />

<bean id="GroupMembersDAO" class="gov.mt.dphhs.epts.repository.GroupMembersDAO" />

<bean id="GroupsDAO" class="gov.mt.dphhs.epts.repository.GroupsDAO" />

<bean id="EventNotificationsDAO" class="gov.mt.dphhs.epts.repository.EventNotificationsDAO" />

<bean id="EventListingsDAO" class="gov.mt.dphhs.epts.repository.EventListingsDAO" />

<bean id="EventGroupXrefDAO" class="gov.mt.dphhs.epts.repository.EventGroupXrefDAO" />

<bean id="EventsDAO" class="gov.mt.dphhs.epts.repository.EventsDAO" />