org.hibernate.exception.GenericJDBCException: could not load an entity: [com.cartif.database.Role#Project]

I am developing with Hibernate. So, when I want to load a eentity, I get an error like:

org.hibernate.exception.GenericJDBCException: could not load an entity: [com.cartif.database.Role#Project]

My hibernate mapping file is:

<hibernate-mapping> 
<class name="com.cartif.database.Role" table="Role">
    <id column="name" name="name" type="java.lang.String"/>
    <property column="permission" generated="never" lazy="false" name="permission" type="java.lang.Integer"/>
</class>
</hibernate-mapping>

And the call on session is:

(Role)DatabaseManager.loadObject(Role.class, loadUser(login).getRole())

public static Object loadObject(Class o, String id){
    if(session == null) createSession();
    return session.get(o, i开发者_如何学Cd);
}

I have checked the package and the name of table, but they are OK! What could the problem be?

Thanks!

Regards!

Sorry, the user which I have connected does not have permission. I add grants to user in database and it runs!