？ Spring+Hibernate不能保存clob字段
我的配置如下：
applicationContext.xml

<!--   使用spring+hibernate处理oracle   BLOB-->
<bean   id= "nativeJdbcExtractor "
class= "org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor "   />
<bean   id= "oracleLobHandler "
class= "org.springframework.jdbc.support.lob.OracleLobHandler "
lazy-init= "true ">
<property   name= "nativeJdbcExtractor ">
<ref   bean= "nativeJdbcExtractor "   />
</property>
</bean>


sessionFactory也加了这个属性
<property   name= "lobHandler ">
<ref   bean= "oracleLobHandler "   />
</property>

对应的hbm.xml里面对应的配置：
<property   name= "ggnr "   type= "org.springframework.orm.hibernate3.support.ClobStringType ">
<column   name= "GGNR "   />   <!--GGNR   表示公告的内容-->
</property>


对应的form为：private   String   ggnr;

主程序：

/*
  *   发布新公告
  */
public   boolean   addGgxx(HttpSession   session,   EditGgxxForm   editGgxxForm)   {
String   title   =   (String)   editGgxxForm.getGgzt();
String   nr   =   (String)   editGgxxForm.getGgnr();
Date   date   =   new   Date();
CgGgxx   ggxx   =   new   CgGgxx();
ggxx.setGgnr(nr);
ggxx.setGgzt(title);
ggxx.setFbr((String)   session.getAttribute( "user "));
ggxx.setFbrq(date);
return   ggxxDao.add(ggxx);
}


/**
  *   公告模块的功能实现
  *   @author   WMF
  *
  */
public   class   GgxxDao   extends   HibernateDaoSupport   {
/*
  *   发布新公告
  */
public   boolean   add(CgGgxx   ggxx)   {
try   {
this.getHibernateTemplate().save(ggxx);
this.getHibernateTemplate().flush();
return   true;
}   catch   (Exception   e)   {
e.printStackTrace();
return   false;
}
}
}

发布新公告的时候老是抛以下异常,请各位指教：
16:54:30,078   DEBUG   SessionImpl:219   -   opened   session   at   timestamp:   4837513912639488
16:54:30,078   DEBUG   DefaultSaveOrUpdateEventListener:161   -   saving   transient   instance
16:54:30,078   DEBUG   AbstractBatcher:311   -   about   to   open   PreparedStatement   (open   PreparedStatements:   0,   globally:   1)
16:54:30,078   DEBUG   ConnectionManager:415   -   opening   JDBC   connection
16:54:30,078   DEBUG   SQL:346   -   select   GGXX_SEQ.nextval   from   dual
16:54:30,093   DEBUG   AbstractBatcher:424   -   preparing   statement
16:54:30,093   DEBUG   SequenceGenerator:82   -   Sequence   identifier   generated:   98
16:54:30,093   DEBUG   AbstractBatcher:319   -   about   to   close   PreparedStatement   (open   PreparedStatements:   1,   globally:   2)
16:54:30,140   DEBUG   AbstractBatcher:470   -   closing   statement
16:5