fix

src/main/java/org/gridsuite/study/server/StudyController.java

@@ -922,7 +922,7 @@ public ResponseEntity<Void> setShortCircuitParameters(
     @ApiResponse(responseCode = "200", description = "The short-circuit analysis parameters", content = {
         @Content(mediaType = MediaType.APPLICATION_JSON_VALUE /*, schema = ...*/)})
     public ResponseEntity<String> getShortCircuitParameters(@PathVariable("studyUuid") UUID studyUuid) {
-        return ResponseEntity.ok().body(studyService.getShortCircuitParametersInfo(studyUuid));
+        return ResponseEntity.ok().contentType(MediaType.APPLICATION_JSON).body(studyService.getShortCircuitParametersInfo(studyUuid));
     }
 
     @GetMapping(value = "/studies/{studyUuid}/nodes/{nodeUuid}/network/substations/{substationId}/svg")

src/main/java/org/gridsuite/study/server/StudyWebConfig.java

@@ -7,14 +7,19 @@
 package org.gridsuite.study.server;
 
 import lombok.AllArgsConstructor;
+import org.gridsuite.study.server.converter.UuidHttpConverter;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.format.FormatterRegistry;
+import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
+import java.util.List;
+
 @AllArgsConstructor
 @Configuration
 public class StudyWebConfig implements WebMvcConfigurer {
-    private InsensitiveStringToEnumConverterFactory insensitiveEnumConverterFactory;
+    private final InsensitiveStringToEnumConverterFactory insensitiveEnumConverterFactory;
+    private final UuidHttpConverter uuidConverter;
 
     /**
      * {@inheritDoc}
@@ -23,4 +28,12 @@ public class StudyWebConfig implements WebMvcConfigurer {
     public void addFormatters(final FormatterRegistry registry) {
         registry.addConverterFactory(insensitiveEnumConverterFactory);
     }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void extendMessageConverters(final List<HttpMessageConverter<?>> converters) {
+        converters.add(uuidConverter);
+    }
 }

src/main/java/org/gridsuite/study/server/converter/UuidHttpConverter.java

@@ -0,0 +1,98 @@
+package org.gridsuite.study.server.converter;
+
+import lombok.NonNull;
+import org.jetbrains.annotations.NotNull;
+import org.springframework.boot.context.properties.bind.Binder;
+import org.springframework.boot.web.servlet.server.Encoding;
+import org.springframework.core.env.Environment;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpInputMessage;
+import org.springframework.http.HttpOutputMessage;
+import org.springframework.http.MediaType;
+import org.springframework.http.converter.AbstractHttpMessageConverter;
+import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.http.converter.HttpMessageNotWritableException;
+import org.springframework.lang.Nullable;
+import org.springframework.stereotype.Component;
+import org.springframework.util.MimeType;
+import org.springframework.util.StreamUtils;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * Implementation of {@link HttpMessageConverter} that can read and write {@link UUID} to/from strings.
+ *
+ * @since 2.0
+ */
+@Component
+public class UuidHttpConverter extends AbstractHttpMessageConverter<UUID> {
+    private final Encoding encoding;
+    private final List<Charset> availableCharsets = List.copyOf(Charset.availableCharsets().values());
+
+    protected UuidHttpConverter(@NonNull final Environment environment) {
+        super(StandardCharsets.UTF_8, MediaType.TEXT_PLAIN);
+        encoding = Binder.get(environment).bindOrCreate("server.servlet.encoding", Encoding.class);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    @NotNull
+    public Charset getDefaultCharset() {
+        return Objects.requireNonNullElse(encoding.getCharset(), super.getDefaultCharset());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected boolean supports(final Class<?> clazz) {
+        return UUID.class == clazz;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    @NotNull
+    protected Long getContentLength(UUID uuid, MediaType contentType) throws IOException {
+        return (long) uuid.toString().getBytes(getContentTypeCharset(contentType)).length;
+
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    @NotNull
+    protected UUID readInternal(final Class<? extends UUID> clazz, final HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {
+        return UUID.fromString(StreamUtils.copyToString(inputMessage.getBody(), getContentTypeCharset(inputMessage.getHeaders().getContentType())));
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    protected void writeInternal(final UUID uuid, final HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {
+        final HttpHeaders headers = outputMessage.getHeaders();
+        if (headers.get(HttpHeaders.ACCEPT_CHARSET) == null) {
+            headers.setAcceptCharset(this.availableCharsets);
+        }
+        StreamUtils.copy(uuid.toString(), this.getContentTypeCharset(headers.getContentType()), outputMessage.getBody());
+    }
+
+    @NotNull
+    private Charset getContentTypeCharset(@Nullable final MediaType contentType) {
+        return Objects.requireNonNull(Optional.ofNullable(contentType)
+                                              .map(MimeType::getCharset)
+                                              .orElseGet(this::getDefaultCharset), "No default charset");
+    }
+}

src/main/java/org/gridsuite/study/server/service/shortcircuit/ShortCircuitService.java

@@ -285,14 +285,13 @@ public UUID createParameters(@Nullable final String parametersInfos) {
                                             .build()
                                             .toUri();
         try {
+            HttpHeaders headers = new HttpHeaders();
+            headers.setAccept(List.of(MediaType.TEXT_PLAIN));
             if (StringUtils.isBlank(parametersInfos)) {
-                final String strUuid = restTemplate.postForObject(uri, new HttpEntity<>(new HttpHeaders()), String.class);
-                return UUID.fromString(strUuid);
+                return UUID.fromString(restTemplate.postForObject(uri, new HttpEntity<>(headers), String.class));
             } else {
-                HttpHeaders headers = new HttpHeaders();
                 headers.setContentType(MediaType.APPLICATION_JSON);
-                final String strUuid = restTemplate.postForObject(uri, new HttpEntity<>(parametersInfos, headers), String.class);
-                return UUID.fromString(strUuid);
+                return UUID.fromString(restTemplate.postForObject(uri, new HttpEntity<>(parametersInfos, headers), String.class));
             }
         } catch (final HttpStatusCodeException e) {
             throw handleHttpError(e, CREATE_SHORTCIRCUIT_PARAMETERS_FAILED);
@@ -329,12 +328,11 @@ public UUID duplicateParameters(UUID parametersUuid) {
         try {
             HttpHeaders headers = new HttpHeaders();
             headers.setAccept(List.of(MediaType.TEXT_PLAIN));
-            final String strUuid = restTemplate.postForObject(UriComponentsBuilder.fromUriString(shortCircuitServerBaseUri)
+            return UUID.fromString(restTemplate.postForObject(UriComponentsBuilder.fromUriString(shortCircuitServerBaseUri)
                 .pathSegment(SHORT_CIRCUIT_API_VERSION, "parameters")
                 .queryParam("duplicateFrom", parametersUuid)
                 .buildAndExpand()
-                .toUri(), new HttpEntity<>(headers), String.class);
-            return UUID.fromString(strUuid);
+                .toUri(), new HttpEntity<>(headers), String.class));
         } catch (final HttpStatusCodeException e) {
             throw handleHttpError(e, CREATE_SHORTCIRCUIT_PARAMETERS_FAILED);
         }