Spring RestTemplate and HttpClient connection pooling limit - spring

Question

I'm using RestTemplate on my jsf web server, and with these configuration I often reach limit of connection to routes so soon (exp:/ap-domain/get-all).
How can I release connection to avoid limit?
This is my config class:
#Configuration
public class RestTemplateConfig {
#Bean
public PoolingHttpClientConnectionManager poolingHttpClientConnectionManager() {
PoolingHttpClientConnectionManager result = new PoolingHttpClientConnectionManager();
result.setMaxTotal(100);
result.setDefaultMaxPerRoute(20);
return result;
}
#Bean
public CloseableHttpClient httpClient() throws KeyManagementException, NoSuchAlgorithmException, KeyStoreException {
CloseableHttpClient result = HttpClientBuilder.create()
.setConnectionManager(poolingHttpClientConnectionManager())
.setDefaultRequestConfig(requestConfig())
.setSSLSocketFactory(csf)
.build();
return result;
}
#Bean
public RestTemplate restTemplate() throws KeyManagementException, NoSuchAlgorithmException, KeyStoreException {
HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(httpClient());
RestTemplate restTemplate = new RestTemplate(requestFactory);
restTemplate.setErrorHandler(new RestResponseErrorHandler());
List<ClientHttpRequestInterceptor> interceptors = restTemplate.getInterceptors();
if (interceptors.isEmpty()) {
interceptors = new ArrayList<>();
}
interceptors.add(new RestTemplateHeaderInterceptor());
restTemplate.setInterceptors(interceptors);
return restTemplate;
}
}
My RestUtil to call api:
#Component
public class RestUtil {
private static RestTemplate restTemplate;
#Autowired
public RestUtil(RestTemplate restTemplate) {
RestUtil.restTemplate = restTemplate;
}
public static <T> MessagesResponse<T> exchange(String url, HttpMethod method, Object requestObject, String token, ParameterizedTypeReference<MessagesResponse<T>> type) {
...
}
}