MWS 7.1 does not start with Oracle 11g


I am trying to make work MWS 7.1 with oracle 11g or 10g.
My OS is windows vista.
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 jdbc:oracle:thin:@//:/
It worked with this work.
I tried the same on MWS, but it did not work.
I somebody can help.