persistence.xml:
<persistence>
    <persistence-unit name="RS">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/dp?zeroDateTimeBehavior=convertToNull"/>
            <property name="hibernate.connection.username" value="root"/>
            <property name="hibernate.connection.password" value="admin"/>
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.connection.autocommit" value="true"/>
            <property name="hibernate.current_session_context_class" value="managed"/>
            <property name="hibernate.hbm2ddl.auto" value="update"/>
        </properties>
    </persistence-unit>
</persistence>


hibernate.cfg.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/dp?zeroDateTimeBehavior=convertToNull</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">admin</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.connection.autocommit">true</property>
    <property name="hibernate.current_session_context_class">managed</property>
    <property name="hibernate.hbm2ddl.auto">update</property>

    <mapping class="cz.muni.fi.dp.reservationsystem.dao.Computer"/>
    <mapping class="cz.muni.fi.dp.reservationsystem.dao.User"/>
    <mapping class="cz.muni.fi.dp.reservationsystem.dao.Reservation"/>
  </session-factory>


UserSessionBean:
@Stateless
@LocalBean
public class UserSessionBean {
    @PersistenceContext(unitName = "RS")
    private EntityManager em;

    public void persist(Object obj) {
        em.persist(obj);
    }
}


UserBean:
public class UserBean implements Serializable {
    private boolean badLogin = false;
    private boolean remember;
    private UserDAO udao;
    private String email;
    private String password;
    private String name;

    @EJB
    private UserSessionBean usb;

    public String register() {
        User user = new User();
        user.setEmail(email.toLowerCase());
        user.setPassword(password);
        user.setUserName(name);
        usb.persist(user);
        newUser = true;
        ResourceBundle msg = ResourceBundle.getBundle("messages", new Locale(LanguageBean.getLocaleFromCookie()));

        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(msg.getString("successfulRegistration")));
        return null;
    }
}