Spring RestTemplate with rootUri return URI is not absolute error

Remove / in root:

private static final String root = "http://localhost:8080/test/api";

RestTemplate accepts uriTemplate as long as they start with / so your root should be without it. if it doesn't start with / it will consider it as a full URL

I try with the same code. I do not get this error. Spring boot version: 1.5.0.RELEASE

Instead of POST, I tried with a GET API with same URL pattern.The / at the end of the path does not matter.

@Componentpublic class CoreServiceClient {    private RestTemplate restTemplate;    private static final Logger LOGGER = LoggerFactory.getLogger(CoreServiceClient.class);    private static final String root = "http://localhost:8080/test/api/";    public CoreServiceClient(RestTemplateBuilder restTemplateBuilder) {        restTemplate = restTemplateBuilder.rootUri(root).build();    }    public void updateState(String id) {        try {            ResponseEntity<String> response =                    restTemplate.exchange("/food/{id}/state", HttpMethod.GET, null, String.class, id);            LOGGER.info("Resp: {}", response.getStatusCode());            LOGGER.info("Resp: {}", response.getBody());        } catch (Exception e) {            LOGGER.error(e.getMessage(), e);        }    }}

I added a dummy controller with the same path:

@RestController@RequestMapping("/test/api")public class FooController {    @GetMapping("/food/{id}/state")    public ResponseEntity<String> fooState(@PathVariable String id) {        return new ResponseEntity<String>("EATING", HttpStatus.OK);    }}

To test, I added another controller:

@RestController@RequestMapping("/client")public class CoreServiceClientController {    @Autowired    private CoreServiceClient client;    @GetMapping    public ResponseEntity<String> goGet() {        client.updateState("1001");        return new ResponseEntity<>("HELLO", HttpStatus.OK);    }}

Everything works fine for me.

Log:

2019-01-15 23:23:19.870  INFO 22570 --- [nio-8080-exec-1] com.example.demo001.CoreServiceClient    : Resp: 2002019-01-15 23:23:19.871  INFO 22570 --- [nio-8080-exec-1] com.example.demo001.CoreServiceClient    : Resp: EATING