Take a look at the logs to see if there was a problem creating the tables. I had something similar with my own product & jboss a few weeks ago.
Yes, it says "row-locking-template" tag missing. I think JBoss 3.0 code has changed since cmp2 examples code was updated. But the .dtd in JBoss 3.0 code is also old. I wish the xml descriptors have dtd reference and get validated at the time of deployment.
It looks like you are attempting to use the example 3.0 alpha code on the tip source. The examples will be docs will be updated when the next release comes out.