MWS 7.1 with oracle 11g does not start


I am trying to make work MWS 7.1 with oracle 11g.
But it does not work, it does not start because it does not manage to connec t to database. Here is the stack trace
2008-02-09 15:10:39 CET (Framework : FATAL) [RID:2] - [POP.001.0002] A “java.lang.NullPointerException” occurred with the Message “at com.sun.faces.util.MessageFactory.getApplication(”

According to advantage, it should come from database.
In IS, I have the same problem with jdbc pool : I had no suitable driver when creating a db pool alias.
writeTDnowrap(“row-l”);I create a driver alias connection based on class oracle.jdbc.pool.OracleDataSource and the dburl was jdbcracle:thin:@//:/
It worked with this work.
I tried the same on MWS, but it did not work.
I somebody can help.
Do I need to use oracle 10 ?

In fact I have the same problem with Oracle 10g.
My OS is windows vista. Shoud il come from this ?
If I can have nay help