Looks like that you remove or change the hsql-ds.xml file which provide the DefaultDS database connection.
So how do you start the JBoss and what do you change.
Could you start correct without your deployment?
Thank you very much for the reply Wolf-Dieter Dink.
This problem dissapeared for me after tinketing around a bit. I think it may be I was missing my persistence.xml file so my PersistenceContext annotation in my state bean was freaking out when I tried to make my EntityManager. I am not 100% sure if this was the problem or if that even makes sense because I made many changes to my files before realising my edited .ear was not even being redeployed anyway (I was doing it wrong) but it is currently not an issue anymore.
No problem, your welcome.
Glad to hear that your app is working now.