[SadiQ228]

Сервис:

import { Injectable } from '@angular/core';
import { Http, Response, Headers, RequestOptions } from '@angular/http';
import { Observable } from 'rxjs';
import { User } from './user';


@Injectable()
export class UserService{

    constructor(private _httpService: Http){}

    getAllUsers(){
        return this._httpService.get("http://localhost:7777/webapp/user")
    }

    private handleError(error: Response){
        return Observable.throw(error);
    }

}

компонент:

import {Component, OnInit} from '@angular/core';
import {Router} from '@angular/router';
import {User} from './user';
import { UserService } from './user.service';

@Component({
    selector: 'app-user',
    templateUrl: './user.component.html',
    styleUrls: ['./user.component.css']
})

export class UserComponent implements OnInit{

    users: User[];

    constructor(private _userService: UserService){}
    
    ngOnInit(): void {
        this.getUsers();
    }

    getUsers(): void{
        this._userService.getAllUsers().subscribe(users => console.log(users), error => console.error(error));
    }

}

спасибо большое за подсказку, теперь проект компилируется!!

однако после компиляции выдает ошибку:

ERROR in The target entry-point "@angular/http" has missing dependencies:
- @angular/core
- @angular/platform-browser