olá pessoal!
estou pedalando e não consigo ir à frente com autenticação
estou usando o tutorial: http://www.guj.com.br/articles/184
e não consigo entender muita coisa 
por partes se a classe Usuário :
public class User implements Principal{
private String name;
private Set roles;
public User(String name){
this.name = name;
}
public String getName() {
return name;
}
public Set getRoles() {
return roles;
}
public void setRoles(Set roles) {
if (this.roles == null)
this.roles = roles;
}
}contem os dados na minha versão como seria já que uso JPA devo implementar a interface principal aqui ou crio uma nova
package model;
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import javax.xml.bind.annotation.XmlRootElement;
/**
*
* @author ifrs
*/
@Entity
@Table(name = "usuario")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Usuario.findAll", query = "SELECT u FROM Usuario u"),
@NamedQuery(name = "Usuario.findByCodigo", query = "SELECT u FROM Usuario u WHERE u.codigo = :codigo"),
@NamedQuery(name = "Usuario.findByNome", query = "SELECT u FROM Usuario u WHERE u.nome = :nome"),
@NamedQuery(name = "Usuario.findByEmail", query = "SELECT u FROM Usuario u WHERE u.email = :email"),
@NamedQuery(name = "Usuario.findBySenha", query = "SELECT u FROM Usuario u WHERE u.senha = :senha")})
public class Usuario implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Basic(optional = false)
@GeneratedValue(strategy= GenerationType.IDENTITY)
@Column(name = "codigo")
private Integer codigo;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 15)
@Column(name = "nome")
private String nome;
// @Pattern(regexp="[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", message="E-mail inválido")//if the field contains email address consider using this annotation to enforce field validation
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 40)
@Column(name = "email")
private String email;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 10)
@Column(name = "senha")
private String senha;
public Usuario() {
}
public Usuario(Integer codigo) {
this.codigo = codigo;
}
public Usuario(Integer codigo, String nome, String email, String senha) {
this.codigo = codigo;
this.nome = nome;
this.email = email;
this.senha = senha;
}
dai vem os gets e sets
@Override
public int hashCode() {
int hash = 0;
hash += (codigo != null ? codigo.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Usuario)) {
return false;
}
Usuario other = (Usuario) object;
if ((this.codigo == null && other.codigo != null) || (this.codigo != null && !this.codigo.equals(other.codigo))) {
return false;
}
return true;
}
@Override
public String toString() {
return nome;
}
}o que eu faço?