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我花了两天时间试图解决一个奇怪的问题。我在 MVC Spring App 中工作，当我运行以下测试时......

@ContextConfiguration(locations = "/persistence-beans.xml")
public class UserDaoTest extends AbstractJUnit4SpringContextTests{

    @Autowired
    private UserDao userDao;

    @Test
    public void testAdd() {
        int size = userDao.list().size();
        User user = new User();
        user.setName("omar");
        userDao.add(user);

        List<User> users = userDao.list();

        System.out.println("users size: " + users.size());

        // list should have one more employee now
        assertTrue (size < users.size());
    }
}

我在数据库中看到了结果，一切正常。但是，当我调用控制器并使用相同的 Dao (userDao) 创建用户时，应用程序不会持久化用户并且不会抛出任何错误。我唯一想到的是 servlet-context.xml 部分中来自 Spring 的事务注释存在问题。我可以相信在测试用例中有效，但在应用程序流中无效！拜托，我需要摆脱这个问题！！！！

------ 接口道 --------

public interface GenericDao<E, K> {

    void add(E entity);

    void update(E entity);

    void remove(E entity);

    E find(K key);

    List<E> list();
}

public interface UserDao extends GenericDao<User, Long>{

}

package com.tutorial.dao.impl;

import java.io.Serializable;
import java.util.List;

import com.tutorial.dao.GenericDao;

import java.lang.reflect.ParameterizedType;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;

import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
public class GenericDaoJPAImpl<E, K extends Serializable> implements GenericDao<E, K>{

    @PersistenceContext
    private EntityManager entityManager;
    protected Class<E> daoType;

    @SuppressWarnings("unchecked")
    public GenericDaoJPAImpl() {
        daoType = (Class<E>) ((ParameterizedType) getClass().getGenericSuperclass())
                .getActualTypeArguments()[0];
    }

    public void add(E entity) {
        em().persist(entity);
    }

    public EntityManager em() {
        return entityManager;
    }

    public void setEntityManager(EntityManager entityManager) {
        this.entityManager = entityManager;
    }

    @Override
    public void update(E entity) {
        em().merge(entity);
    }

    @Override
    public void remove(E entity) {
        em().remove(em().merge(entity));
    }

    @Override
    public E find(K key) {
        return (E) em().find(daoType, key);
    }

    @Override
    public List<E> list() {

        List<E> list = null;

        TypedQuery<E> query = em().createQuery("select o from "
                + daoType.getSimpleName() + " o",
                daoType);

        list = query.getResultList();
        return list;

    }

}


@Repository("UserDao")
public class UserDaoImpl extends GenericDaoJPAImpl<User, Long> implements UserDao{
}

-------- 服务层 ------------

@Service("calculatorService")
@Transactional(propagation= Propagation.REQUIRED, readOnly=false)
public class CalculatorServiceImpl implements CalculatorService{

@Autowired
private UserDao userDao;

   @Override 
    public void createUser(User user) {
        userDao.add(user);
    }

}

- - - - - 控制器 - - - - - - - 

@Controller
@RequestMapping("/calculate")
public class CalculatorController {

@Autowired
    private CalculatorService calculatorService;

@RequestMapping(method = RequestMethod.POST)
    public String addUser(User user){

        calculatorService.createUser(user);

        return "session";
    }
}

-------- 持久性 Bean ---------------------------------

<?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:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">

    <!-- we can use annotations -->
    <context:annotation-config />  

    <!-- we will manage transactions with annotations -->
    <tx:annotation-driven />

    <context:component-scan base-package="com.tutorial.dao.impl" />

    <context:property-placeholder location="classpath*:properties/database.properties"/>

   <!-- data source for our database -->
    <bean id="dataSource"  class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${database.driverClassName}"/>
        <property name="url" value="${database.url}"/>
        <property name="username" value="${database.username}"/>
        <property name="password" value="${database.password}"/>
    </bean>

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

   <!-- EntityManagerFactoryBean -->
   <bean class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" id="entityManagerFactory">
        <property name="persistenceUnitName" value="persistenceUnit"/>
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>

---------------------- Servlet 上下文 -------------- ---

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

    <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven />   

    <!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
    <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean>

<!--All beans are scanned here, except the Repository because they are scanned in persistence-beans.xml-->
    <context:component-scan base-package="com.tutorial.*" >
       <context:exclude-filter expression="org.springframework.stereotype.Repository" type="annotation"/>
    </context:component-scan>

</beans:beans>

------------------------------------ WEB XML ------------- --------

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
        /WEB-INF/spring/root-context.xml
        classpath:persistence-beans.xml
        </param-value>
    </context-param>

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Processes application requests -->
    <servlet>
        <servlet-name>calculator</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>calculator</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

这个项目的链接是下一个：https ://github.com/igiagante/calculator

随意下载以证明发生了什么:) 谢谢！

4

1 回答 1

0

您似乎错过了 CalculatorServiceImpl。虽然您的 dispatcher-servlet.xml 确实如此。

尝试添加

<context:component-scan base-package="where your service is"/>

在您的根应用程序上下文中，并在您的调度程序-servlet 中删除不必要的组件扫描。

于 2013-08-13T03:26:54.180 回答