I'm developing a app in NetBeans 6, using GlassFish and EJB 3 but when I call the method createEntityManagerFactory, passing as parameter the name of my persistence.xml, I receive an Exception (HibernateException: Could not find datasource.). I looked the hibernate's source and the line is when the hibernate try to lookup my datasource, however I looked the Glassfish configuration and the register of the JNDI is there.

In my EJB project, I have a session bean stateless as a facade, and I have a generic dao in BMT, and in my persistenceutil I try to get the entitymanagerfactory, and I get this error.

Someone can help me??

I usually forget to add "java:/" before the JNDI name in the persistence.xml.
The datasource name is absolute, the persistence.xml is going to lookup from a relative JNDI path, unless you specify the root.
So if my datasource is bound to "myds" I will have to look it up as "java:/myds".

I'm just guessing, as you didn't post the configuration..

regards,
Sanne