NullInjectorError Error: No provider for

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I'm having this error message: 

ERROR Error: StaticInjectorError[CervejaService]: 
  StaticInjectorError[CervejaService]: 
    NullInjectorError: No provider for CervejaService!
    at _NullInjector.get (core.js:993)
    at resolveToken (core.js:1281)
    at tryResolveToken (core.js:1223)
    at StaticInjector.get (core.js:1094)
    at resolveToken (core.js:1281)
    at tryResolveToken (core.js:1223)
    at StaticInjector.get (core.js:1094)
    at resolveNgModuleDep (core.js:10878)
    at NgModuleRef_.get (core.js:12110)
    at resolveDep (core.js:12608)

And I'm sure it's because of this line of code: 

import { Cerveja } from './../core/model';
import { Injectable } from '@angular/core';
import { Http } from '@angular/http';

@Injectable()
export class CervejaService {

  cervejasUrl = 'http://localhost:8080/cervejas';

  constructor(private http: Http) { }

  adicionar(cerveja: Cerveja): Promise<Cerveja> {
        return this.http.post(this.cervejasUrl,
        JSON.stringify(cerveja))
      .toPromise()
      .then(response =>  response.json());
  }
}

How do I know what's coming back? Would there be any way to apply a console.log to this method?

    
asked by anonymous 17.01.2018 / 12:00

1 answer

1

You need to add your CervejaService to the providers list of your module.

Example: 

import { CervejaService } from './cerveja.service';

@NgModule({
  imports: [
    // ...
  ],
  declarations: [
    // ...
  ],
  providers: [
    CervejaService, // seu provider aqui
  ]
})
    
17.01.2018 / 12:19
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