Looks like you are trying to deploy 2 datasources, both with the JNDI name
You need to ensure that your datasources are unique and only deployed once.
I not sure, but it looks like there is only 1 DS in that example. Error arised because i previously deployed and then
undeployed (ant) hibernate booking example and i guess it didnt cleaned up everything.
Now the question is how to remove mbean from AS without reinstalling latter.