问题描述
- Spring整合hibernate4时出现no session错误
-
首先将eclipse抛出的错误贴出来：严重: Servlet.service() for servlet [springDispatcherServlet] in context with path [/VideoMngSys] threw exception [Request processing failed; nested exception is org.hibernate.HibernateException: No Session found for current thread] with root cause org.hibernate.HibernateException: No Session found for current thread at org.springframework.orm.hibernate4.SpringSessionContext.currentSession(SpringSessionContext.java:106) at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:988) at com.vincent.videosys.dao.BaseDao.getSession(BaseDao.java:17) at com.vincent.videosys.dao.UserDao.usernameExist(UserDao.java:29) at com.vincent.videosys.service.UserService.usernameExistService(UserService.java:19) at com.vincent.videosys.controller.home.UserController.usernameExist(UserController.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle (ServletInvocableHandlerMethod.java:104) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod (RequestMappingHandlerAdapter.java:748) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal (RequestMappingHandlerAdapter.java:689) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle (AbstractHandlerMethodAdapter.java:83) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931) ....
下面依次贴出我的相关文件代码：
1.web.xml<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <!-- 加载Spring配置文件，Spring应用上下文，理解层次化的ApplicationContext --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 可以将POST请求转为PUT请求和DELETE请求 --> <filter> <filter-name>HiddenHttpMethodFilter</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>HiddenHttpMethodFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- The front controller of this Spring Web application, responsible for handling all application requests --> <servlet> <servlet-name>springDispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- Map all requests to the DispatcherServlet for handling --> <servlet-mapping> <servlet-name>springDispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>login.jsp</welcome-file> </welcome-file-list> </web-app>2.spring-mvc.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" ......> <!-- 向Spring容器注册AutowiredAnnotationBeanPostProcessor、 CommonAnnotationBeanPostProcessor、 PersistenceAnnotationBeanPostProcessor、 RequiredAnnotationBeanPostProcessor，使系统能识别注解 --> <context:annotation-config /> <!-- 使用annotation自动注册bean，并检查@Controller、@Service、@Repository --> <context:component-scan base-package="com.vincent.videosys"></context:component-scan> <!-- 导入资源文件 --> <context:property-placeholder location="classpath:db.properties"/> <!-- 配置C3P0数据源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> <property name="driverClass" value="${jdbc.driverClass}"></property> <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property> <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property> </bean> <!-- 配置SessionFactory --> <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource"></property> <property name="configLocation" value="classpath:hibernate.cfg.xml"></property> <property name="packagesToScan"> <list> <value>com.vincent.videosys.*</value> </list> </property> </bean> <!-- 配置hibernate的事务管理器 --> <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <!-- 定义AutoWired自动注入bean --> <bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"></bean> <!-- 用注解来实现事务管理 --> <tx:annotation-driven transaction-manager="transactionManager"/> <!-- 3. 配置事务切入点, 再把事务属性和事务切入点关联起来 --> <aop:config> <aop:pointcut expression="execution(* com.vincent.videosys.service.*.*(..))" id="txPointcut"/> <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/> </aop:config> </beans>4.hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Database connection settings --> <!-- JDBC connection pool (use the built-in) --> <!-- <property name="connection.pool_size">1</property>--> <!-- 数据库使用的方言 --> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Echo all executed SQL to stdout --> <!-- 设置 打印输出 sql 语句 为真 --> <property name="hibernate.show_sql">true</property> <!-- 设置格式为 sql --> <property name="hibernate.format_sql">true</property> <!-- 第一次加载 hibernate 时根据实体类自动建立表结构，以后自动更新表结构 --> <property name="hibernate.hbm2ddl.auto">update</property> <property name="hibernate.current_session_context_class">org.springframework.orm.hibernate4.SpringSessionContext</property> </session-factory> </hibernate-configuration>5.db.properties
jdbc.user=root
jdbc.password=root
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/videomngsysjdbc.initPoolSize=5
jdbc.maxPoolSize=10- BaseDao.java
package com.vincent.videosys.dao; import javax.annotation.Resource; ..... @Repository("baseDao") public class BaseDao{ @Autowired protected SessionFactory sessionFactory; public Session getSession(){ return this.sessionFactory.getCurrentSession(); } }7.UserDao.java
package com.vincent.videosys.dao; import org.hibernate.Query; import org.hibernate.Session; .... @Repository("userDao") public class UserDao extends BaseDao{ protected SessionFactory sessionFactory; /** * 查看该用户名在数据库中是否存在 * 存在返回true * 不存在返回false * 默认返回true * @param username * @return */ public boolean usernameExist(String username){ boolean exist = true; String hqlString = "from user where username = :username"; Session session = super.getSession(); Query query = session.createQuery(hqlString); query.setParameter("username", username); List<User> list = query.list(); if(list.size() > 0) { exist = false; } return exist; } }8 UserService.java
package com.vincent.videosys.service; import javax.annotation.Resource; import org.springframework.beans.factory.annotation.Autowired; ... @Transactional @Service("userService") public class UserService { @Autowired private UserDao userDao; public boolean usernameExistService(String username){ return userDao.usernameExist(username); } }- UserController.java
package com.vincent.videosys.controller.home; import java.util.HashMap; import java.util.Map; import javax.annotation.Resource; ..... @RequestMapping("/user") @Controller public class UserController { @Autowired private UserService userService; @ResponseBody @RequestMapping(value="/usernameExist",method=RequestMethod.POST) public Map<String, String> usernameExist(@RequestParam("username")String usernameString ){ Map<String, String> resultMap = new HashMap<String, String>(); System.out.println("username: "+usernameString); if(userService.usernameExistService(usernameString)){ resultMap.put("status", "1");//exits } else{ resultMap.put("status", "0");//not exist } return resultMap; } }每次程序执行到UserController类中的userNameExist方法时，开始调用userService中的方法时，便开始抛出错误.....
解决方案
hibernate 错误 org.hibernate.LazyInitializationException: could not initialize proxy - no Session
hibernate错误：could not initialize proxy - no Session
Hibernate3 错误： could not initialize proxy - no Session
解决方案二：
加上这段配置试试
/tx:attributes
/tx:advice
解决方案三：
<tx:advice id="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="save*" propagation="REQUIRED"/>
<tx:method name="add*" propagation="REQUIRED"/>
<tx:method name="create*" propagation="REQUIRED"/>
<tx:method name="insert*" propagation="REQUIRED"/>
<tx:method name="*" read-only="true" />
</tx:attributes>
</tx:advice>
时间： 2024-09-13 11:51:35