Hello there,
I've started using Hibernate with EJB3, but I've got the following error:

javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.PropertyValueException: not-null property references a null or transient value: eu.virtualLab.users.model.Usr.password

I've followed many tutorials (and probably this is the real problem) and my code seems to be fine

the facade bean:

//add user to database
 logger.info("[addUsr] password value? -> "+password);
 Usr user = new Usr(username,password,_role,_name,surname,companyName,vat,
 address,city,postcode,country,email,phone,false);
 em.persist(user);

The POJO

@Column(name="password", nullable=false)
 private String password;
 public String getPassword() {
 return password;
 }
 public void setPassword(String password) {
 this.password = password;
 }

The persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
 <persistence-unit name="Users-EJBModulePU" transaction-type="RESOURCE_LOCAL">
 <!-- Jboss uses hibernate as default persistence engine
 <provider>org.hibernate.ejb.HibernatePersistence</provider> -->
 <jta-data-source>java:/MySqlDS</jta-data-source>
 <class>eu.virtualLab.users.model.Usr</class>
 <exclude-unlisted-classes>true</exclude-unlisted-classes>
 <properties>
 <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
 <!-- Show and print nice SQL on stdout -->
 <property name="hibernate.show_sql" value="true"/>
 <property name="hibernate.format_sql" value="true"/>
 <!-- Use it just in development -->
 <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
 </properties>
 </persistence-unit>
</persistence>

The password parameter is not empty (it is showed by the logger), so where is my mistake?

Thanks in advance.