Question

我正在使用springframework 3.2和jboss server 7.1。尝试使用jpa2（hibernate提供程序，mysql）和spring mvc设置一个简单的spring应用程序。

我使用一个简单的DAO，我在家庭控制器中注入自动注释。这个dao类只有一个字段（em）for persistentContext被注入，它可能更简单，我不使用persistence.xml，因为从版本3.1弹出并且不需要一个.....注意包被扫描正确我已尝试过网上发布的其他解决方案（包括此处）... 但我得到这个错误：

org.springframework.beans.factory.BeanCreationException：无法 autowire字段：com.stko.home.model.daos.UserDao com.stko.home.controllers.HomeController.userDao;嵌套异常是 org.springframework.beans.factory.BeanCreationException：错误创建名为'userDao'的bean：注入持久性依赖失败;嵌套异常是 org.springframework.beans.factory.NoSuchBeanDefinitionException：没有 [javax.persistence.EntityManagerFactory]类型的唯一bean是已定义：预期单个bean但找到0： org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:514） org.springframework.beans.factory.annotation.InjectionMetadata.inject（InjectionMetadata.java:87） org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:285） org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean（AbstractAutowireCapableBeanFactory.java:1120） org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:522） org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:461） org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:295） org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:223） org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:292） org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:194） org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:607） org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:932） org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:479） org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext（FrameworkServlet.java:647） org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext（FrameworkServlet.java:598） org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext（FrameworkServlet.java:661） org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext（FrameworkServlet.java:517） org.springframework.web.servlet.FrameworkServlet.initServletBean（FrameworkServlet.java:458） org.springframework.web.servlet.HttpServletBean.init（HttpServletBean.java:138） javax.servlet.GenericServlet.init（GenericServlet.java:242） org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke（WebNonTxEmCloserValve.java:50） org.jboss.as.web.security.SecurityContextAssociationValve.invoke（SecurityContextAssociationValve.java:153） org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:102） org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:368） org.apache.coyote.http11.Http11Processor.process（Http11Processor.java:877） org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process（Http11Protocol.java:671） org.apache.tomcat.util.net.JIoEndpoint $ Worker.run（JIoEndpoint.java:930） java.lang.Thread.run（Thread.java:722）

我的applicationContext.xml：

<bean class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" id="dataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/mmydb"/>
    <property name="username" value="user"/>
    <property name="password" value="1234"/>
</bean>

<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />

<bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" >

<property name="dataSource" ref="dataSource"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
    </property>


    <property name="packagesToScan" value="com.stko.home.model.entities"/>

            <property name="jpaProperties">
                <props>
                    <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
                    <prop key="hibernate.max_fetch_depth">3</prop>
                    <prop key="hibernate.show.sql">true</prop>
                    <prop key="hibernate.connection.charSet"> UTF-8</prop>
                </props>

            </property>
        </bean>

<!--  tell spring to use annotation based congfigurations -->
<context:annotation-config />

 <!-- scan for beans -->
<context:component-scan base-package="com.stko.home.model.daos"/>

<!-- to recognize persistnce annotations like PersistenceContext -->
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>
<tx:annotation-driven transaction-manager="transactionManager" />

<bean id="databaseProperties" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:database.properties"/>
</bean>

我的servlet-context.xml：

<!-- 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>


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

我的web.xml：

<!-- 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</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>appServlet</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>appServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

我的用户道：

@Service("userDao")
@Repository
public class UserDao implements Serializable {
  @PersistenceContext
  private EntityManager em;

  @Transactional
  public  void saveUser(User user) {
  if(user!=null)
   em.persist(user);
  }

}

我的实体类用户：

   @Entity
   @Table(name = "user")
   public class User implements Serializable {

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   @Column(name = "userid")
   private Integer userid;

   @Column(name="username")
   private String username;
   public User(){}
   }

我典型的家庭控制器：

@Controller
public class HomeController {
.....

@Autowired
UserDao userDao;

@RequestMapping(value = "/", method = RequestMethod.GET)
public String home(Locale locale, Model model) {

.....


User newUser = new User();
newUser.setName("blabla");

userDao.saveUser(newUser);

return "home";
} 

}

Answer 1

您是否有一个persistence.xml，您已在其中定义了持久性单元？

Answer 2

问题很可能是servlet-context.xml文件中的这一行：

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

本质上是在Web应用程序上下文中再次尝试创建DAO。你应该只有一个过滤器，只在这里创建你的控制器：

<context:component-scan base-package="com.stko.home">
<context:include-filter expression="org.springframework.stereotype.Controller" type="annotation" />
</context:component-scan>

Answer 3

试试这个

<bean class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" id="entityManagerFactory">
    <property name="persistenceUnitName" value="persistenceUnit"/>
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaDialect">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />
    </property>
</bean>

定义EMF bean的属性，persistenceUnit应该是你在persistence.xml上声明的名称

没有定义[javax.persistence.EntityManagerFactory]类型的唯一bean：期望的单个bean但找到0：

3 个答案: