java.lang.UnsupportedOperationException:Clobs are not cacheable

我将原来的一个VARCHAR2字段更改为CLOB字段后，无论查看还是保存该表的数据都报上面的错误    
  环境：
  HIBERNATE3
  WEBLOGIC 8.1
  ORACLE9i
  WINDOWS2000
 
  错误信息：
 
  ERROR [ExecuteThread: '14' for queue: 'weblogic.kernel.Default'] (BulletinAction
  .java:249) - java.lang.UnsupportedOperationException: Clobs are not cacheable
  java.lang.UnsupportedOperationException: Clobs are not cacheable
  at org.hibernate.type.ClobType.disassemble(ClobType.java:83)
  at org.hibernate.type.TypeFactory.disassemble(TypeFactory.java:338)
  at org.hibernate.cache.entry.CacheEntry.<init>(CacheEntry.java:37)
  at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:
  124)
  at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.j
  ava:492)
  at org.hibernate.loader.Loader.doQuery(Loader.java:411)
  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Lo
  ader.java:206)
  at org.hibernate.loader.Loader.loadEntity(Loader.java:1271)
  at org.hibernate.loader.entity.EntityLoader.load(EntityLoader.java:141)
  at org.hibernate.loader.entity.EntityLoader.load(EntityLoader.java:126)
  at org.hibernate.loader.entity.BatchingEntityLoader.load(BatchingEntityL
  oader.java:81)
  at org.hibernate.persister.entity.BasicEntityPersister.load(BasicEntityP
  ersister.java:2496)
  at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(D
  efaultLoadEventListener.java:387)
  at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEv
  entListener.java:368)
  at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEven
  tListener.java:166)
  at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEven
  tListener.java:140)
  at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEv
  entListener.java:119)
  at org.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:577)
  at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyIn
  itializer.java:59)
  at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(Abstrac
  tLazyInitializer.java:80)
  at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializ
  er.java:134)
  at com.mtm.wsjdzf.po.BulletinBoard$$EnhancerByCGLIB$$7ce70752.getDtExecu
  te(<generated>)
  at com.mtm.wsjdzf.action.xzbg.BulletinAction.browBulletin(BulletinAction
  .java:206)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
  java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
  sorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:324)
  at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchActio
  n.java:280)
  at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:
  216)
  at org.apache.struts.action.RequestProcessor.processActionPerform(Reques
  tProcessor.java:484)
  at org.apache.struts.action.RequestProcessor.process(RequestProcessor.ja
  va:274)
  at org.apache.struts.action.ActionServlet.process(ActionServlet.java:148