Hmm, one possible reason is that, you may not copy the repository entries to G3's repository directly, as all the jar files are required to be bundles. Could you try to deploy the driver into the repository with admin console ?
I have been unable to create this database pool from console or cmd in G3.
I installed G2.2.1 and physically copied the repository entries to its repository and it worked in 2.2.1 first time.
In G3 it cannot load a class, DB2XADataSource.class . Not an issue in G2.2.1
I am on Win7 Pro 64bit.
Any ideas would be helpful.
Have a Great Day!