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我是Spring的新手，所以我把Spring 3.0M3放在我的Mac上的Tomcat服務器上，做了一個Eclipse項目，完成了一個Hello World，然後想做一個對象持久與Hibernate。我在我的MySQL服務器上創建了一個用戶表，使用所有的getter和setter創建了一個User對象（我真的希望Java在這裏從Objective-C中取出一個隊列並添加動態屬性，生成的屬性代碼會造成太多的代碼混亂） ，創建一個UserDao對象來查找並保存一個用戶，並創建了bean配置。它相當好......除了會話未初始化。爲什麼是這樣？我可以使用這些憑據從這臺計算機上很好地訪問數據庫。Hibernate/Spring3：無法初始化代理 - 沒有會話
我意識到這可能只是普通的初學者的東西，但我發現的所有錯誤，而谷歌搜索一直是在從Hibernate 2轉換到3時中途丟失會話的人。我沒有過渡，並且據我所知，這個會議從來沒有完成。
這裏是我的錯誤：
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)
這裏是我的相關Bean servlet配置：
<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>
這裏是我的用戶等級：
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;
}
}
這裏是我的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;
}
}
這裏是我的UserService接口
public interface UserService {
public User lookupUser(String webUserId);
public void setUserDao(UserDao userDao);
}
及其實施：
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);
}
}
最後，這裏是我的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;
}
}
我希望你有一些好的建議，我可以使用： - ）如果代碼中還有其他東西，你會覺得我做錯了/非春天的方式，我很想聽聽帽子也是如此。
乾杯
Nik
查看更新的答案 – skaffman 2009-07-30 14:01:29