我做了一个多对多的关联,并进行添删改查的操作,但当进行到删除的出现异常。异常信息如下:org.springframework.orm.hibernate3.HibernateSystemException: Illegal attempt to associate a collection with two open sessions; nested exception is org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions
org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:660)
org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:413)
org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:363)
org.springframework.orm.hibernate3.HibernateTemplate.delete(HibernateTemplate.java:744)
org.springframework.orm.hibernate3.HibernateTemplate.delete(HibernateTemplate.java:740)
com.cs.dao.BasicServiceManager.delete(BasicServiceManager.java:93)
com.cs.action.CourseDeleteAction.perform(CourseDeleteAction.java:37)
org.apache.struts.action.ActionServlet.processActionPerform(ActionServlet.java:1787)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1586)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:492)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:660)
org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:413)
org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:363)
org.springframework.orm.hibernate3.HibernateTemplate.delete(HibernateTemplate.java:744)
org.springframework.orm.hibernate3.HibernateTemplate.delete(HibernateTemplate.java:740)
com.cs.dao.BasicServiceManager.delete(BasicServiceManager.java:93)
com.cs.action.CourseDeleteAction.perform(CourseDeleteAction.java:37)
org.apache.struts.action.ActionServlet.processActionPerform(ActionServlet.java:1787)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1586)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:492)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"><beans>
<!-- Spring 数据源的定义 -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName">
<value>com.mysql.jdbc.Driver</value>
</property>
<property name="url">
<value>jdbc:mysql:///user</value>
</property>
<property name="username">
<value>root</value>
</property>
<property name="password">
<value></value>
</property>
</bean>
<!--Hibernate SessionFactory定义 -->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref local="dataSource" />
</property>
<property name="mappingResources">
<list>
<value>com/cs/entity/Course.hbm.xml</value>
<value>com/cs/entity/Student.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean> <!-- Spring 声明性事务定义 -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref local="sessionFactory" />
</property>
</bean> <!--Spring事务代理工厂定义 -->
<bean id="baseTxProxy" abstract="true"
class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager">
<ref bean="transactionManager" />
</property>
<property name="transactionAttributes">
<props>
<prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="save*">PROPAGATION_REQUIRED</prop>
<prop key="update*">PROPAGATION_REQUIRED</prop>
<prop key="delete*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<!-- Spring 数据访问异常的定义 -->
<bean id="jdbcExceptionTranslator"
class="org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator">
<property name="dataSource">
<ref bean="dataSource" />
</property>
</bean>
<!--HibernateTemplate定义 -->
<bean id="hibernateTemplate"
class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
<property name="jdbcExceptionTranslator">
<ref bean="jdbcExceptionTranslator" />
</property>
</bean>
<!-- <bean id="basicService"
class="com.hhs.service.dao.BasicServiceManager">
<property name="hibernateTemplate">
<ref bean="hibernateTemplate" />
</property>
</bean>--> <bean id="CSDaoImp"
class="com.cs.dao.logic.CSDaoImp">
<property name="hibernateTemplate">
<ref bean="hibernateTemplate" />
</property>
</bean>
</beans>
这个错误在于删除时.先声明一个实体类去接了查出来的数据,然后用另声明一个实体去实现删除.这种才能出现2个以上同一个对象的session.