java.sql.SQLRecoverableException: 关闭的语句

请教，环境Linux + WebLogic 10.3 + oracle 10 + JDK6，新建用户的时候老是报以下错误，这是什么原因啊。开始以为是数据库驱动的问题，可是我换了ojdbc14.jar / ojdbc6.jar结果都一样。
com.xpn.xwiki.XWikiException: Error number 3201 in 3: Exception while saving document xwiki:XWiki.XWikiUsers
Wrapped Exception: Failed to commit or rollback transaction. Root cause []
        at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.java:698)
        at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:177)
        at com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:170)
        at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:1392)
        at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:1348)
        at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:1343)
        at com.xpn.xwiki.XWiki.getUserClass(XWiki.java:3065)
        at com.xpn.xwiki.XWiki.createUser(XWiki.java:3873)
        at com.xpn.xwiki.XWiki.createUser(XWiki.java:3537)
        at com.xpn.xwiki.api.XWiki.createUser(XWiki.java:1296)
        at com.xpn.xwiki.api.XWiki.createUser(XWiki.java:1269)
"kb.log" 500L, 51211C                                                                                                                                                        48,1           6%
        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406) [weblogic.jar:10.3.0.0]
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201) [com.bea.core.weblogic.workmanager_1.4.0.0.jar:1.4.0.0]
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:173) [com.bea.core.weblogic.workmanager_1.4.0.0.jar:1.4.0.0]
Caused by: org.hibernate.HibernateException: Failed to commit or rollback transaction. Root cause []
        at com.xpn.xwiki.store.XWikiHibernateBaseStore.endTransaction(XWikiHibernateBaseStore.java:924) ~[xwiki-platform-legacy-oldcore-4.1-milestone-1.jar:na]
        at com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.java:688) ~[xwiki-platform-legacy-oldcore-4.1-milestone-1.jar:na]
        ... 112 common frames omitted
Caused by: org.hibernate.exception.JDBCConnectionException: could not update: [com.xpn.xwiki.objects.StringProperty#component[id,name]{id=-1733853835381121621, name=sheet}]
        at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2612) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2494) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2821) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:113) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:185) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at com.xpn.xwiki.store.XWikiHibernateBaseStore.endTransaction(XWikiHibernateBaseStore.java:917) ~[xwiki-platform-legacy-oldcore-4.1-milestone-1.jar:na]
        ... 113 common frames omitted
Caused by: java.sql.SQLRecoverableException: 关闭的语句
        at oracle.jdbc.driver.OracleClosedStatement.setString(OracleClosedStatement.java:734) ~[ojdbc6.jar:11.2.0.3.0]
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.setString(OraclePreparedStatementWrapper.java:280) ~[ojdbc6.jar:11.2.0.3.0]
        at org.apache.commons.dbcp.DelegatingPreparedStatement.setString(DelegatingPreparedStatement.java:135) ~[commons-dbcp-1.3.jar:1.3]
        at org.apache.commons.dbcp.DelegatingPreparedStatement.setString(DelegatingPreparedStatement.java:135) ~[commons-dbcp-1.3.jar:1.3]
        at org.apache.commons.dbcp.DelegatingPreparedStatement.setString(DelegatingPreparedStatement.java:135) ~[commons-dbcp-1.3.jar:1.3]
        at org.hibernate.type.descriptor.sql.VarcharTypeDescriptor$1.doBind(VarcharTypeDescriptor.java:52) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:91) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:283) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:278) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.type.AbstractSingleColumnStandardBasicType.nullSafeSet(AbstractSingleColumnStandardBasicType.java:89) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2184) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2558) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
        ... 125 common frames omitted