我正在尝试更新MySql Db中的记录。在更新时引发以下异常
org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions
at org.hibernate.collection.AbstractPersistentCollection.setCurrentSession(AbstractPersistentCollection.java:410)
at org.hibernate.event.def.OnUpdateVisitor.processCollection(OnUpdateVisitor.java:43)
at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:101)
at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:61)
at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:55)
at org.hibernate.event.def.AbstractVisitor.process(AbstractVisitor.java:123)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:293)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:223)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:89)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:495)
at com.tcs.ignite.ih.spring.dao.UserDAOImpl.saveUpdateUserbean(UserDAOImpl.java:185)
at com.tcs.ignite.ih.spring.dao.UserDAOImpl.blockuser(UserDAOImpl.java:204)
at com.tcs.ignite.ih.spring.service.UserServiceImpl.blockUser(UserServiceImpl.java:187)
at com.tcs.ignite.ih.spring.controller.AdminHomeController.BlockUser(AdminHomeController.java:48)
我检查 session 。它在每种方法的Final块中关闭。无法找出问题所在。我能够用其他方法插入更新操作，没有任何问题，但是只有saveUpdateUserBean方法会引发异常
UserDAOImpl:
import com.tcs.ignite.ih.hibernate.model.Userdetails;
import com.tcs.ignite.ih.hibernate.model.Userlog;
import com.tcs.ignite.ih.hibernate.model.Userrole;
import com.tcs.ignite.ih.spring.bean.LoginBean;
import com.tcs.ignite.ih.spring.util.LogFile;
import java.util.List;
import org.hibernate.Hibernate;
import org.hibernate.SQLQuery;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.criterion.Restrictions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
@Repository
@Transactional
public class UserDAOImpl implements UserDAO {
@Autowired
private SessionFactory sessionFactory;
public SessionFactory getSessionFactory() {
return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
@Override
public Userdetails getUserDetails(String username) {
Session session = getSessionFactory().openSession();
Userdetails u = null;
try {
u = (Userdetails) getSessionFactory().openSession()
.createCriteria(Userdetails.class)
.add(Restrictions.eq("email", username)).uniqueResult();
} catch (Exception e) {
LogFile.log.error("UserDAO getuserDetails(): " + e.toString());
} finally {
if (session.isOpen()) {
session.close();
}
return u;
}
}
@Override
public boolean saveUpdateUserbean(Userdetails u) {
Session session = getSessionFactory().openSession();
Transaction tr = session.beginTransaction();
boolean y = false;
try {
session.saveOrUpdate(u);
tr.commit();
y = true;
} catch (Exception e) {
tr.rollback();
e.printStackTrace();
} finally {
if (session.isOpen()) {
session.close();
}
return y;
}
}
@Override
public boolean blockuser(String email) {
Userdetails u = this.getUserDetails(email);
return this.saveUpdateUserbean(u);
}
}
ServiceImpl:
import com.tcs.ignite.ih.hibernate.model.Userdetails;
import com.tcs.ignite.ih.hibernate.model.Userlog;
import com.tcs.ignite.ih.spring.bean.LogBean;
import com.tcs.ignite.ih.spring.bean.RegisterBean;
import com.tcs.ignite.ih.spring.bean.UserBean;
import com.tcs.ignite.ih.spring.bean.loadUserBean;
import com.tcs.ignite.ih.spring.dao.UserDAO;
import com.tcs.ignite.ih.spring.util.Time;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
public class UserServiceImpl implements UserService {
@Autowired
UserDAO dao;
@Override
public boolean blockUser(String email) {
return dao.blockuser(email);
}
}
applicationContext.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
p:location="classpath:jdbc.properties" />
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="${jdbc.driverClassName}"
p:url="${jdbc.url}"
p:username="${jdbc.username}"
p:password="${jdbc.password}"/>
<!-- ADD PERSISTENCE SUPPORT HERE (jpa, hibernate, etc) -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="packagesToScan" value="com.tcs.ignite.ih.hibernate.model" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<tx:annotation-driven />
</beans>
我能够使用相同的配置执行所有数据库操作，但是当我从serviceImpl调用其调用DAO方法的blockuser()方法并且saveupdateUserBean抛出上述异常时？我想念什么吗？
最佳答案
hibernate manual says:
就我而言，这很有帮助。
道:
public void updateUser(User user) throws UserException {
sessionFactory.getCurrentSession().merge(user);
}
POJO广告(一个用户有很多广告):
@OneToMany(mappedBy = "oUser", fetch = FetchType.LAZY)
public List<Ad> getAoAdList() {
return aoAdList;
}