GWT con Hibernate

Hi all,
I'm programming with GWT and I would like to use Hibernate as
persistence framework .. But I have a problem when I make an action
that I perform the operation of the log (I click on the button) come
out the following errors:

00:00:11,621 [ERROR] Line 20: No source code is available for type
org.apache.commons.logging.Log; did you forget to inherit a required
module?

00:00:11,621 [ERROR] Line 20: No source code is available for type
org.apache.commons.logging.LogFactory; did you forget to inherit a
required module?

00:00:11,621 [ERROR] Line 34: No source code is available for type
org.hibernate.Session; did you forget to inherit a required module?

00:00:11,621 [ERROR] Line 37: No source code is available for type
org.hibernate.HibernateException; did you forget to inherit a required
module?

00:00:11,622 [ERROR] Line 69: No source code is available for type
org.hibernate.LockMode; did you forget to inherit a required module?

00:00:11,622 [ERROR] Line 105: No source code is available for type
org.hibernate.criterion.Criterion; did you forget to inherit a
required module?

00:00:11,622 [ERROR] Line 107: No source code is available for type
org.hibernate.Criteria; did you forget to inherit a required module?

Infine lancia UmbrellaException

However, in the configuration file path gwt.xml also specific classes
of the persistence of the type:

<source path='persistence'/>

Thank you for availability.

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