Folks,
 I have encountered another problem when trying to finish the installation of
 xwiki.
 From xwiki.log, the top most error is: 
 22:39:01,281 [
http://servername.com/xwiki/bin/view/Main/]
 [http-8080-Processor25] FATAL tion.ConnectionProviderFactory  - Could not
 instantiate connection provider
 java.lang.ClassNotFoundException:
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:164)
        at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:100)
 Is this error about the placement of the JDBC driver? I've placed it in
 /common/lib already. 
Why are you placing it in there? Just put it in webapps/xwiki/WEB-INF/lib
You must also edit the hibernate.cfg.xml file to enable the connector.
--
Sergiu Dumitriu