got you any hint or solution for this "No ClassLoader defined" problem. I'm going crazy with the same problem. Occuring during loading of an little MBean, written for setting the castor jdo configuration.
Thanks for your help.
Something terrible has happened. I tried to upgrade JBoss 3.0.1 to the 3.2.1 and faced with the same problem!
I can understand such big difference in functionality between major versions but not 3.0.1 -> 1.2.1