use springboot managed resttemplate

src/main/java/org/gridsuite/voltageinit/server/RestTemplateConfig.java

@@ -13,6 +13,7 @@
 import com.powsybl.commons.report.ReportNodeDeserializer;
 import com.powsybl.commons.report.ReportNodeJsonModule;
 import com.powsybl.openreac.parameters.input.json.OpenReactJsonModule;
+import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.converter.HttpMessageConverter;
@@ -27,8 +28,8 @@
 public class RestTemplateConfig {
 
     @Bean
-    public RestTemplate restTemplate() {
-        final RestTemplate restTemplate = new RestTemplate();
+    public RestTemplate restTemplate(RestTemplateBuilder builder) {
+        final RestTemplate restTemplate = builder.build();
 
         //find and replace Jackson message converter with our own
         for (int i = 0; i < restTemplate.getMessageConverters().size(); i++) {

src/main/java/org/gridsuite/voltageinit/server/service/NetworkModificationService.java

@@ -55,17 +55,19 @@ public class NetworkModificationService {
 
     private String networkModificationServerBaseUri;
 
-    private final RestTemplate restTemplate = new RestTemplate();
+    private final RestTemplate restTemplate;
 
     private final ObjectMapper objectMapper;
 
     private final UuidGeneratorService uuidGeneratorService;
 
     NetworkModificationService(@Value("${gridsuite.services.network-modification-server.base-uri:http://network-modification-server/}") String networkModificationServerBaseUri,
-                               ObjectMapper objectMapper, UuidGeneratorService uuidGeneratorService) {
+                               ObjectMapper objectMapper, UuidGeneratorService uuidGeneratorService,
+                               RestTemplate restTemplate) {
         this.networkModificationServerBaseUri = networkModificationServerBaseUri;
         this.objectMapper = objectMapper;
         this.uuidGeneratorService = uuidGeneratorService;
+        this.restTemplate = restTemplate;
     }
 
     public void setNetworkModificationServerBaseUri(String networkModificationServerBaseUri) {

src/main/java/org/gridsuite/voltageinit/server/service/parameters/FilterService.java

@@ -56,16 +56,18 @@ public class FilterService implements FilterLoader {
 
     private static String filterServerBaseUri;
 
-    private final RestTemplate restTemplate = new RestTemplate();
+    private final RestTemplate restTemplate;
 
     private final NetworkStoreService networkStoreService;
 
     public static final String FILTERS_NOT_FOUND = "Filters not found";
 
     public FilterService(NetworkStoreService networkStoreService,
-                         @Value("${gridsuite.services.filter-server.base-uri:http://filter-server/}") String filterServerBaseUri) {
+                         @Value("${gridsuite.services.filter-server.base-uri:http://filter-server/}") String filterServerBaseUri,
+                         RestTemplate restTemplate) {
         this.networkStoreService = networkStoreService;
         setFilterServerBaseUri(filterServerBaseUri);
+        this.restTemplate = restTemplate;
     }
 
     public static void setFilterServerBaseUri(String filterServerBaseUri) {

src/test/java/org/gridsuite/voltageinit/server/service/parameters/FilterServiceTest.java

@@ -33,7 +33,7 @@ class FilterServiceTest {
 
     @BeforeEach
     void setUp() {
-        filterService = spy(new FilterService(Mockito.mock(NetworkStoreService.class), "http://filter-server/"));
+        filterService = spy(new FilterService(Mockito.mock(NetworkStoreService.class), "http://filter-server/", null));
     }
 
     @Test