The problem is solved using this line..
@PersistenceCapable(identityType = IdentityType.DATASTORE, detachable
= "false")
everything else is just fine, thank you for all.

------ SOLUTION ------

package ar.com.app.domain;

import java.io.Serializable;

import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "USUARIOS")
@PersistenceCapable(identityType = IdentityType.DATASTORE, detachable
= "false")
/**
 * Clase User
 * @author Cristian Miranda
 * @since v0.1
 */
public class User implements Serializable {

        /**
         * UID
         */
        private static final long serialVersionUID = -4440813061365306611L;

        @Id
        @Column(name = "ID")
        private Integer id;

        @Column(name = "USERNAME")
        private String username;

        @Column(name = "PASSWORD")
        private String password;

        public Integer getId() {
                return id;
        }

        public void setId(Integer id) {
                this.id = id;
        }

        public String getUsername() {
                return username;
        }

        public void setUsername(String username) {
                this.username = username;
        }

        public String getPassword() {
                return password;
        }

        public void setPassword(String password) {
                this.password = password;
        }

}

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