小贝子编程

双向多对多和DAO以HibernateException结束



我正在为学校开发一个基于Web的数据库前端。但是我对多对多关系有问题。当我注释掉它时，我的服务器启动没有问题。这是启动的堆栈跟踪。

 [java] SCHWERWIEGEND: Exception sending context initialized event to listener instance of class org.docadmin.ContextListener
 [java] org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions
 [java]     at org.hibernate.collection.AbstractPersistentCollection.setCurrentSession(AbstractPersistentCollection.java:410)
 [java]     at org.hibernate.event.def.OnUpdateVisitor.processCollection(OnUpdateVisitor.java:43)
 [java]     at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:101)
 [java]     at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:61)
 [java]     at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:55)
 [java]     at org.hibernate.event.def.AbstractVisitor.process(AbstractVisitor.java:123)
 [java]     at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:293)
 [java]     at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:223)
 [java]     at org.hibernate.event.def.DefaultUpdateEventListener.performSaveOrUpdate(DefaultUpdateEventListener.java:33)
 [java]     at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
 [java]     at org.hibernate.impl.SessionImpl.fireUpdate(SessionImpl.java:564)
 [java]     at org.hibernate.impl.SessionImpl.update(SessionImpl.java:552)
 [java]     at org.hibernate.impl.SessionImpl.update(SessionImpl.java:544)
 [java]     at org.docadmin.security.DBAuthentication.login(DBAuthentication.java:87)
 [java]     at org.docadmin.ContextListener.contextInitialized(ContextListener.java:74)
 [java]     at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206)
 [java]     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
 [java]     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
 [java]     at org.apache.catalina.core.ContainerBase.access$000(ContainerBase.java:124)
 [java]     at org.apache.catalina.core.ContainerBase$PrivilegedAddChild.run(ContainerBase.java:146)
 [java]     at java.security.AccessController.doPrivileged(Native Method)
 [java]     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:777)
 [java]     at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
 [java]     at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943)
 [java]     at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778)
 [java]     at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504)
 [java]     at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
 [java]     at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
 [java]     at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
 [java]     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
 [java]     at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
 [java]     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
 [java]     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
 [java]     at org.apache.catalina.core.StandardService.start(StandardService.java:525)
 [java]     at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
 [java]     at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 [java]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 [java]     at java.lang.reflect.Method.invoke(Method.java:616)
 [java]     at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
 [java]     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
 [java] 02.06.2012 09:42:54 org.apache.catalina.core.StandardContext listenerStart
 [java] SCHWERWIEGEND: Exception sending context initialized event to listener instance of class org.docadmin.ContextListener
 [java] org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions
 [java]     at org.hibernate.collection.AbstractPersistentCollection.setCurrentSession(AbstractPersistentCollection.java:410)
 [java]     at org.hibernate.event.def.OnUpdateVisitor.processCollection(OnUpdateVisitor.java:43)
 [java]     at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:101)
 [java]     at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:61)
 [java]     at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:55)
 [java]     at org.hibernate.event.def.AbstractVisitor.process(AbstractVisitor.java:123)
 [java]     at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:293)
 [java]     at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:223)
 [java]     at org.hibernate.event.def.DefaultUpdateEventListener.performSaveOrUpdate(DefaultUpdateEventListener.java:33)
 [java]     at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
 [java]     at org.hibernate.impl.SessionImpl.fireUpdate(SessionImpl.java:564)
 [java]     at org.hibernate.impl.SessionImpl.update(SessionImpl.java:552)
 [java]     at org.hibernate.impl.SessionImpl.update(SessionImpl.java:544)
 [java]     at org.docadmin.security.DBAuthentication.login(DBAuthentication.java:87)
 [java]     at org.docadmin.ContextListener.contextInitialized(ContextListener.java:74)
 [java]     at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206)
 [java]     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
 [java]     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
 [java]     at org.apache.catalina.core.ContainerBase.access$000(ContainerBase.java:124)
 [java]     at org.apache.catalina.core.ContainerBase$PrivilegedAddChild.run(ContainerBase.java:146)
 [java]     at java.security.AccessController.doPrivileged(Native Method)
 [java]     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:777)
 [java]     at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
 [java]     at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943)
 [java]     at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778)
 [java]     at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504)
 [java]     at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
 [java]     at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
 [java]     at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
 [java]     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
 [java]     at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
 [java]     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
 [java]     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
 [java]     at org.apache.catalina.core.StandardService.start(StandardService.java:525)
 [java]     at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
 [java]     at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [java]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 [java]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 [java]     at java.lang.reflect.Method.invoke(Method.java:616)
 [java]     at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
 [java]     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

这是多对多关系的第一个表

 @Entity
 @Table(name="VFSUSR")
 @NamedQueries({
    @NamedQuery(name="org.docadmin.db.persistence.vfsusrById",
        query="from VfsUser as vfsusr where vfsusr.id = :id"),
    @NamedQuery(name="org.docadmin.db.persistence.vfsusrByLogin",
        query="from VfsUser as vfsusr where vfsusr.login = :vfsusrlogin"),
      })
      public class VfsUser
        extends AbstractBasePersistableObject
      {
    /**
     * the tables id, primary key
     */
    @Id
    @Column(name="VFSUSR_ID")
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;
    /**
     * foreign key many to many relationship
     */
    @ManyToMany(mappedBy="user")
    private Set<VfsGroup> group;
 }
多

对多关系的第二类。

 @Entity
 @Table(name="VFSGRP")
 @NamedQueries({
    @NamedQuery(name="org.docadmin.db.persistence.vfsgrpById",
        query="from VfsGroup as vfsgrp where vfsgrp.id = :id"),
    @NamedQuery(name="org.docadmin.db.persistence.vfsgrpByGroupName",
        query="from VfsGroup as vfsgrp where vfsgrp.groupName = :vfsgrpgroupname"),
 })
 public class VfsGroup {
    /**
     * the tables id, primary key
     */
    @Id
    @Column(name="VFSGRP_ID")
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;
    /**
     * foreign key many to many relationship
     */
    @ManyToMany(cascade=CascadeType.ALL)
    @JoinTable(name="VFSGRPUSR",
            joinColumns={@JoinColumn(name="VFSUSR")},
            inverseJoinColumns={@JoinColumn(name="VFSGRP")})
    private Set<VfsGroup> user;
 }

最后是引发异常的代码。

         /* retrieve some beans */
        sessionFactory = (SessionFactory) ApplicationContextProvider.getApplicationContext().getBean("sessionFactory");
        /* retrieve user */
        user = userDAO.getVfsUserByLogin(login);
        /* open session and begin transaction */
        session = sessionFactory.openSession();
        tx = session.beginTransaction();
        securityToken = null;
        try {
            if(user != null && Arrays.equals(user.getPassword(), passwordStoreManager.getPasswordStore().encryptPassword(password))){
                securityToken = generateToken();
                user.setToken(securityToken);
                session.update(user);
            }
        } catch (InvalidKeyException e) {
            e.printStackTrace();
            logger.error("couldn't login as user[" + login + "] with password[****]", e);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            logger.error("couldn't login as user[" + login + "] with password[****]", e);
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            logger.error("couldn't login as user[" + login + "] with password[****]", e);
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
            logger.error("couldn't login as user[" + login + "] with password[****]", e);
        } catch (BadPaddingException e) {
            e.printStackTrace();
            logger.error("couldn't login as user[" + login + "] with password[****]", e);
        }finally{
            /* commit transaction */
            tx.commit();
            /* close session */
            session.close();
        }
        return(securityToken);

您可能想访问 docadmin 上 sourceforge.net

    @Override
    public VfsUser getVfsUserByLogin(final String login) {
        if(login == null){
            return(null);
        }
        return((VfsUser) getHibernateTemplate().execute(new HibernateCallback() {
            public Object doInHibernate(Session session) {
                Query query = getSession().getNamedQuery("org.docadmin.db.persistence.vfsusrByLogin");
                query.setString("vfsusrlogin", login);
                return (VfsUser) query.uniqueResult();
            }
        }));
    }
我会

说错误相当明显。您正在加载一个对象，在本例中是保持打开状态的会话中的用户。然后调用 update，这会尝试将该对象附加到新会话。

这一行：

user = userDAO.getVfsUserByLogin(login);

必须打开会话才能加载用户。然后显式打开另一个会话并调用更新。如果用户已经附加到会话，您实际上不需要调用更新，因为 Hibernate 已经自动检查它。

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