[xwiki-users] NullPointerException at HqlSqlWalker.lookupProperty( HqlSqlWalker.java:560)

Hi, I am trying to deploy production version( .war deployment ) of XWIKI to Oracle11g and Tomcat environment. I tried every version of xwiki with different versions of Tomcat. It deploys the application succesfully but when i request http://localhost:8080/xwiki keep getting "NullPointerException at HqlSqlWalker.lookupProperty( HqlSqlWalker.java:560)" error. As far as i see, tables are created at the database but i cant pass this error. I also tried with tomcat and h2 database to check whether it's database related issue and same stack trace. I also tried with Weblogic 11g application server and Oracle 11g database and same stack trace. P.S: I could run standalone version. Kemalettin Ocak Uzman Mühendis Havelsan A.Ş. Dikkat: Bu elektronik posta mesaji kisisel ve ozeldir. Eger size gonderilmediyse lutfen gondericiyi bilgilendirip mesaji siliniz.Firmamiza gelen ve giden mesajlar virus taramasindan gecirilmektedir. Mesajdaki gorusler gondericiye ait olup HAVELSAN A.S. resmi gorusu olmak zorunda degildir. Attention: This e-mail message is private and privileged.If you are not the recipient for whom this e-mail message is intended, please notify the sender immediately and delete this e-mail message from your system.All sent and received e-mail messages go through a virus scan. Any opinions presented in this e-mail message are solely those of the author and do not necessarily represent HAVELSAN A.S.`s formal and authorized views.