Creating a WLS datasource using JMX

Hello, I'm trying to create a weblogic datasource by using the JMX layer (the target server is a WLS 10.0 MP1).

So I wrote a little java JMX client, and as far as I understand the reference documentation, I have to register a weblogic.j2ee.descriptor.wl. JDBCDataSourceBean object in the Edit MBean Server. The documentation says the JMX domain name must be com.bea for non custom MBeans, which is the case of the one I'm woking on. I did several tests an I always get an weblogic.management. NoAccessRuntimeException (JMX error 149520), followed by this message : "An attempt was made to Register an MBean with ObjectName com.bea:Name=testDS,Type=