Oracle, what's wrong with you? Why do you have in every minor release of glashfish after 4.1 weird bugs which cost several hours of debugging of the own software until discovering there's a glassfish bug occurring in typical situations but there is no fix in sight.
In 4.1.1 there was a bug in the admin panel which throws a exception if you tried to configure JMS and in 4.1.2 there is a bug which prevent finding and loading a necessary class for using jax-rs despite it's available.
I have do complete an assignemt until friday and such bugs are such a pain since i change so many thing just to find out that my first structure/config/etc. was correct.