Hibernate/Spring3:无法初始化代理-没有会话

我是Spring的新手，所以我将Spring 3.0M3放在Mac上的Tomcat服务器上，创建了一个Eclipse项目，完成了Hello World，然后希望使对象与Hibernate保持一致.我已经在MySQL服务器上创建了一个User表，并创建了一个包含所有getter和setter的User对象(我真的希望Java从这里的Objective-C队列中添加动态属性.生成的属性代码太多了，代码杂乱无章) ，制作了一个UserDao对象来查找和保存用户，并进行了Bean配置.进行得很好...除了未初始化会话外.为什么是这样?我可以使用这些凭据从这台计算机访问数据库.

I'm new at Spring, so I put Spring 3.0M3 on a Tomcat server on my Mac, made an Eclipse project, completed a Hello World and then wanted to make an object persist with Hibernate. I've made a User table on my MySQL server, made a User object with all getters and setters (I really wish Java would take a queue from Objective-C here and add dynamic properties. Too much code clutter with generated property-code), made a UserDao object to look up and save a User, and made the bean config. It goes fairly well... except for that the session isn't initialized. Why is this? I can access the database just fine from this computer using those credentials.

我意识到这可能只是普通的初学者，但是我在谷歌搜索时发现的所有错误都是在从Hibernate 2过渡到3时中途丢失会话的人.据我所知，会话从未进行过.

I realize that this is probably just normal beginner stuff, but all I've found on the error while googling has been people that are loosing the sessions mid-way when transitioning from Hibernate 2 to 3. I'm not transitioning, and as far as I can tell the session is never made.

这是我的错误:

SEVERE: Servlet.service() for servlet HelloApp threw exception
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:57)
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
    at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:150)
    at com.saers.data.entities.User$$EnhancerByCGLIB$$c2f16afd.getName(<generated>)
    at com.saers.view.web.controller.HelloWorldController.handleRequestInternal(HelloWorldController.java:22)
    at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:763)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:709)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:613)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:525)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
    at java.lang.Thread.run(Thread.java:637)

这是我为相关bean设置的servlet:

Here is my servlet config for the related beans:

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName"   value="com.mysql.jdbc.Driver" />
    <property name="url"     value="jdbc:mysql://10.0.0.3:3306/HelloDB" />
    <property name="username" value="hello" />
    <property name="password" value="w0rld" />
    <property name="initialSize" value="2" />
    <property name="maxActive" value="5" />
  </bean>

  <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="annotatedClasses">
      <list>
        <value>com.saers.data.entities.User</value>
      </list>
    </property>
    <property name="hibernateProperties">
      <props>
        <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
        <prop key="hibernate.show_sql">true</prop>
        <prop key="hibernate.lazy">false</prop>
      </props>
    </property>
  </bean>

  <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory"/>
  </bean>

  <bean id="userDAO" class="com.saers.data.dao.UserDao">
    <property name="sessionFactory" ref="sessionFactory"/>
  </bean>

  <bean id="txProxyTemplate" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" abstract="true">
    <property name="transactionManager" ref="transactionManager"/>
    <property name="transactionAttributes">
      <props>
        <prop key="add*">PROPAGATION_REQUIRED</prop>
        <prop key="update*">PROPAGATION_REQUIRED</prop>
        <prop key="delete*">PROPAGATION_REQUIRED</prop>
        <prop key="*">PROPAGATION_SUPPORTS,readOnly</prop>
      </props>
    </property>
  </bean>

  <bean id="userService" parent="txProxyTemplate">
    <property name="target">
      <bean class="com.saers.business.UserServiceImpl">
        <property name="userDao" ref="userDAO"/>
      </bean>
    </property>
    <property name="proxyInterfaces" value="com.saers.business.UserService"/>
  </bean>

  <bean name="/" class="com.saers.view.web.controller.HelloWorldController">
    <property name="userService" ref="userService"/> 
  </bean>

这是我的用户类别:

package com.saers.data.entities;

import java.util.Date;
import java.io.Serializable;

import javax.persistence.*;

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

    private static final long serialVersionUID = -6123654414341191669L;

    @Id
    @Column(name = "WebUserId")
    private String WebUserId;

    @Column(name = "Name")
    private String Name;
    /**
     * @return the webUserId
     */
    public synchronized String getWebUserId() {
        return WebUserId;
    }
    /**
     * @param webUserId the webUserId to set
     */
    public synchronized void setWebUserId(String webUserId) {
        WebUserId = webUserId;
    }
    /**
     * @return the name
     */
    public synchronized String getName() {
        return Name;
    }
    /**
     * @param name the name to set
     */
    public synchronized void setName(String name) {
        Name = name;
    }
}

这是我的UserDao:

And here is my UserDao:

package com.saers.data.dao;

import java.util.List;

import com.saers.data.entities.User;

import org.springframework.orm.hibernate3.support.*;


public class UserDao extends HibernateDaoSupport {

    public void saveUser(User user) {
        getHibernateTemplate().saveOrUpdate(user);
    }

    public User lookupUser(String WebUserId) {
        User user = getHibernateTemplate().load(User.class, WebUserId);
        return user;
        return user;
    }
}

这是我的UserService界面

Here's my UserService interface

public interface UserService {

    public User lookupUser(String webUserId);
    public void setUserDao(UserDao userDao);
}

及其实现:

public class UserServiceImpl implements UserService {

    private UserDao userDao;
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public User lookupUser(String webUserId) {

        return userDao.lookupUser(webUserId);
    }
}

最后，这是我的HelloWorldController:

And finally, here's my HelloWorldController:

package com.saers.view.web.controller;

import com.saers.data.entities.User;
import com.saers.business.UserService;

import org.springframework.web.servlet.mvc.*;
import org.springframework.web.servlet.*;
import javax.servlet.http.*;
import org.apache.commons.logging.*;



public class HelloWorldController extends AbstractController {

  protected final Log logger = LogFactory.getLog(getClass());

  @Override
  public ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {

    logger.info("Get bean");
    User user = userService.lookupUser("helloUser");
    logger.info("Found out that this user was last changed " + user.getName());
    logger.info("Return View");
    ModelAndView mv = new ModelAndView("HelloWorld.jsp", "user", user);
    return mv;
  }

  private UserService userService = null;
  public void setUserService(UserService userService) {
      this.userService = userService;
  }

}

我希望您有一些我可以使用的好技巧:-)如果代码中还有其他问题，您会觉得我做错了/非有弹性的方法，那么我也很乐意听到.

I hope you have some good tips I can use :-) If there's anything else in the code you feel that I'm doing the wrong/non-spring way, I would love to hear about that as well.

欢呼

Nik