Weblogic JNDI Settings cannot reach my Database

 Hi, I encounter some issue on Weblogic JNDI connection. 

I'm using a Red Hat Enterprise Linux Server release 5.5 (Tikanga) inside a Virtualbox running on a MacOS.

In that particular VM Linux, I installed Weblogic Development version 10.3.6 and also an Oracle 11g R2 database. It means both of them are in the same place, so I'm using 'Localhost' in my JNDI settings.

After I setup everything needed for JNDI connection in Weblogic like this:

And my hibernate.cfg configuration file like this:

However, I'm still getting this exception on my application:

[01/12/2013] [17:59:22:572] [ERROR] [JDBCExceptionReporter]:101 - Connections could not be acquired from the underlying database!