this.userService.login(this.user) .subscribe( () => this.router.navigate(["/all"]), (error) => {
    alert("Unfortunately we could not find your account.");
    console.dump(error)
 } );

login(user: User) {
     let headers = new Headers();
     headers.append("Content-Type", "application/x-www-form-urlencoded");
     headers.append("Accept", "application/json");
     let options = new RequestOptions({ headers: headers, withCredentials: true });
     let data = "j_username=" + user.username + "&" + "j_password=" + user.password;
     return this.http.post(Config.apiUrlS + "static/auth/j_spring_security_check", data, options);
}