Updated code with communication and notification.

src/main/java/net/gepafin/tendermanagement/util/Utils.java

@@ -1,5 +1,6 @@
 package net.gepafin.tendermanagement.util;
 
+import java.io.IOException;
 import java.lang.reflect.Field;
 import java.lang.reflect.Type;
 import java.nio.charset.StandardCharsets;
@@ -310,6 +311,23 @@ public class Utils {
 
 		return new StringTokenizer(header, ",").nextToken().trim();
 	}
+	public static <T> List<T> convertJsonToList(String json, TypeReference<List<T>> typeRef) {
+		ObjectMapper objectMapper = new ObjectMapper();
+		try {
+			return objectMapper.readValue(json, typeRef);
+		} catch (IOException e) {
+			e.printStackTrace();
+			return Collections.emptyList();
+		}
+	}
+
+	public static String convertObjectToJson(Object obj) {
+		try {
+			if(obj == null){return null;}
+			return new ObjectMapper().writeValueAsString(obj);
+		} catch (JsonProcessingException e) {
+			log.error("Failed to convert object to JSON: {}", e.getMessage(), e);
+			throw new RuntimeException("Failed to convert object to JSON", e);}}
 
 	public static String replaceSpacesWithUnderscores(String content) {
 		if (content == null) {

src/main/java/net/gepafin/tendermanagement/util/Validator.java

@@ -135,11 +135,10 @@ public class Validator {
 		return requestedUser;
 	}
 	
-	private Long getUserIdFromToken(HttpServletRequest request) {
+	public Long getUserIdFromToken(HttpServletRequest request) {
 		Map<String, Object> userInfo= tokenProvider.getUserInfoAndUserIdFromToken(request);
 		return Long.parseLong(userInfo.get("userId").toString());
 	}
-	
 	public CallEntity validateUserWithCall(UserEntity user, Long callId) {
 		CallEntity callEntity = callService.validateCall(callId);
 		if(Boolean.FALSE.equals(user.getHub().getId().equals(callEntity.getHub().getId()))) {