RestTemplate PATCH request

I solved this problem just adding a new HttpRequestFactory to my restTemplate instance. Like this

RestTemplate restTemplate = new RestTemplate();

HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
requestFactory.setConnectTimeout(TIMEOUT);
requestFactory.setReadTimeout(TIMEOUT);

restTemplate.setRequestFactory(requestFactory);

For TestRestTemplate, add

@Autowired
private TestRestTemplate restTemplate;

@Before
public void setup() {
    restTemplate.getRestTemplate().setRequestFactory(new HttpComponentsClientHttpRequestFactory());
}

PS: You will need add httpClient component in your project

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.4.1</version>
</dependency>