Untitled

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>1.9.13</version>
</dependency>

@RestController
public class CandidatosWS {

@Autowired
CandidatoService candidatoService;

@RequestMapping(value = "/candidatos/", method = RequestMethod.GET)
public ResponseEntity<List<Candidato>> allCandidatos() {

    List<Candidato> listCandidatos = null;

    try {

        listCandidatos = candidatoService.listarCandidatos();

    } catch (Exception e) {
        e.printStackTrace();
    }

    return new ResponseEntity<List<Candidato>>(listCandidatos, HttpStatus.OK);
    }
}

<html>
    <head>
        <title>Error</title>
    </head>
    <body>Not Acceptable</body>
</html>