[xwiki-users] Search problem

Hi, I installed xwiki on WebSphere/Oracle environment. But search function does not work properly.. It just responds as "Error 500: ". In the log file I saw the following exceptions (I didn't paste all of the stack trace) It seems Lucene does not work, and there is also a datatypes related ORACLE problem.. I'm not sure whether they are related.. Any idea? thanks, Tamer PS: XWiki version is : 1.4.1.10194 2008-08-01 21:13:51,373 [Lucene index rebuilder thread] [Lucene Index Rebuilder] ERROR lucene.IndexRebuilder - Error in lucene rebuild thread java.lang.NullPointerException at com.ibm.ws.webcontainer.srt.SRTServletRequest$SRTServletRequestHelper.access$1600(SRTServletRequest.java:2232) at com.ibm.ws.webcontainer.srt.SRTServletRequest.getQueryString(SRTServletRequest.java:1207) at com.xpn.xwiki.web.XWikiServletRequest.getQueryString(XWikiServletRequest.java:193) at com.xpn.xwiki.render.DefaultXWikiRenderingEngine.getKey(DefaultXWikiRenderingEngine.java:335) .... 2008-08-01 21:14:18,646 [Lucene index updating thread] [Lucene Index Updater] ERROR lucene.ObjectData - error extracting fulltext for do cument xwiki:Main.AllDocs.default.objects java.lang.ClassCastException: com.xpn.xwiki.objects.StringProperty incompatible with com.xpn.xwiki.objects.ListProperty at com.xpn.xwiki.objects.BaseCollection.getListValue(BaseCollection.java:327) ..... 2008-08-01 21:13:50,795 [http://wiki.test/bin/view/Main/] [Default : 0] ERROR impl.StatsUtil - Failed to search visit object in t he database from cookie com.xpn.xwiki.XWikiException: Error number 3223 in 3: Exception while searching documents with sql from VisitStats as obj where obj.cookie=? and obj.e ndDate > ? order by obj.endDate desc Wrapped Exception: could not execute query at com.xpn.xwiki.store.XWikiHibernateStore.search(XWikiHibernateStore.java:2121) at com.xpn.xwiki.store.XWikiHibernateStore.search(XWikiHibernateStore.java:2056) ..... Wrapped Exception: java.sql.SQLException: ORA-00932: inconsistent datatypes: expected - got CLOB at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331) at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288) at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:745)