Call EJB 3 from GWT

hi,
i trying to call EJB 3 from GWT RPC,
i use Eclipse 3.6 GWT 2.2.0 and Glassfish 3.1,
i write simple ejb, the EJB work fine if i call him from application
EE client (servlet),
but when i try to call the EJB from GWT RPC i get error, Null pointer
exeption.
my question is it possible to call EJB 3 that found in glassfish 3.1
from GWT 2.2.0 ?

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