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401 status error on API request

I always get this error when trying to implement simple web service that displays just a msg (angular5 + spring boot)

this is the error

:vendor.bundle.js:62557 ERROR HttpErrorResponse {headers: HttpHeaders,
status: 401, statusText: "OK", url: "localhost:8080/hello";, ok:
false, …} error : "... headers : HttpHeaders
{normalizedNames: Map(0), lazyUpdate: null, lazyInit: ƒ} message :
"Http failure response for localhost:8080/hello: 401 OK" name :
"HttpErrorResponse" ok : false status : 401 statusText : "OK" url :
"localhost:8080/hello";

this is my simple code:

controller.java:

@GetMapping("/hello")
public String sayhello(){ return "{"message": "Hello, world!"}";}
}


hello.component.ts:

import { Component, OnInit } from '@angular/core';
import { HttpClient, HttpErrorResponse, HttpParams } from '@angular/common/http';
import { Observable } from 'rxjs/Rx';
import { Adresse } from '../shared/adresse';
@Component({
selector: 'app-forgot', templateUrl: './forgot.component.html',
styleUrls: ['./forgot.component.css']
})
export class ForgotComponent implements OnInit {
message: string;
ip: string = Adresse.ip;
constructor(private http: HttpClient) { }
ngOnInit(): void {
this.http.get(this.ip + '/hello').subscribe(data => {
console.log('DATA', data);
this.message = data['message'];
})
}
}


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