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obtainAccessToken(loginData){
    let params = new URLSearchParams();
    params.append('username',loginData.username);
    params.append('password',loginData.password);    
    params.append('grant_type','password');
    params.append('client_id','fooClientIdPassword');
    let headers = new Headers({'Content-type': 'application/x-www-form-urlencoded; charset=utf-8', 'Authorization': 'Basic '+btoa("fooClientIdPassword:secret")});
    let options = new RequestOptions({ headers: headers });
     
    this._http.post('http://localhost:8081/spring-security-oauth-server/oauth/token', params.toString(), options)
      .map(res => res.json())
      .subscribe(
        data => this.saveToken(data),
        err => alert('Invalid Credentials')); 
  }