hibernate <many to many> 与 sql2000 的问题

想做一个many to many 的程序.但是插入数据时总是出错.
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.hibernate.exception.SQLGrammarException: could not insert collection: [org.mybeans.Student.teachers#3]
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:59)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:935)
org.hibernate.action.CollectionRecreateAction.execute(CollectionRecreateAction.java:23)
org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239)
org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:223)
org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:274)
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
org.hibernate.impl.SessionImpl.flush(SessionImpl.java:730)
org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:324)
org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:86)
org.mydaos.StuDAO.save(StuDAO.java:13)
org.myservlets.AddTest.doGet(AddTest.java:41)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.6 logs.不知是什么意思..大家有遇到过这样的情况吗? 请教各位该如何解决!