Catch 2 different types of exception

src/main/java/ch/dlmw/swisssignchallenge/controllers/SigningRequestDocumentController.java

@@ -23,29 +23,23 @@ public class SigningRequestDocumentController implements SigningRequestDocumentA
 
     @Override
     public ResponseEntity<Void> patchSigningRequestDocument(String id, List<PatchOperation> patchOperations) {
-        // Fetch the existing document
         var document = signingRequestDocumentService.getSigningRequestDocument(id);
 
         try {
-            ObjectMapper mapper = new ObjectMapper();
-            // Serialize patchOperations to JsonNode
-            JsonNode patchNode = mapper.valueToTree(patchOperations);
+            JsonNode patchNode = objectMapper.valueToTree(patchOperations);
 
-            // Create JsonPatch from JsonNode
             JsonPatch jsonPatch = JsonPatch.fromJson(patchNode);
 
-            // Apply patch to the document's JsonNode
-            JsonNode patchedNode = jsonPatch.apply(mapper.convertValue(document, JsonNode.class));
+            JsonNode patchedNode = jsonPatch.apply(objectMapper.convertValue(document, JsonNode.class));
 
-            // Convert the patched JsonNode back to SigningRequestDocument
-            SigningRequestDocument patchedDocument = mapper.treeToValue(patchedNode, SigningRequestDocument.class);
+            SigningRequestDocument patchedDocument = objectMapper.treeToValue(patchedNode, SigningRequestDocument.class);
 
-            // Now, update the document in the service layer
             signingRequestDocumentService.updateSigningRequestDocument(patchedDocument);
 
             return ResponseEntity.noContent().build();
-        } catch (IOException | JsonPatchException e) {
-            // Handle exceptions appropriately
+        } catch (JsonPatchException e) {
+            throw new IllegalArgumentException("Failed to apply patch", e);
+        } catch (IOException e) {
             throw new RuntimeException("Failed to apply patch", e);
         }
     }