Check offset value have or not

components/device-mgt/io.entgra.device.mgt.core.device.mgt.api/src/main/java/io/entgra/device/mgt/core/device/mgt/api/jaxrs/service/impl/UserManagementServiceImpl.java

@@ -697,26 +697,29 @@ public class UserManagementServiceImpl implements UserManagementService {
                 user.setLastname(getClaimValue(username, Constants.USER_CLAIM_LAST_NAME));
                 userList.add(user);
             }
-
-            int toIndex = offset + limit;
-            int listSize = userList.size();
-            int lastIndex = listSize - 1;
-
-            List<UserInfo> offsetList;
-            if (offset <= lastIndex) {
-                if (toIndex <= listSize) {
-                    offsetList = userList.subList(offset, toIndex);
+            if (offset==0) {
+                return Response.status(Response.Status.OK).entity(userList).build();
+            } else {
+                int toIndex = offset + limit;
+                int listSize = userList.size();
+                int lastIndex = listSize - 1;
+
+                List<UserInfo> offsetList;
+                if (offset <= lastIndex) {
+                    if (toIndex <= listSize) {
+                        offsetList = userList.subList(offset, toIndex);
+                    } else {
+                        offsetList = userList.subList(offset, listSize);
+                    }
                 } else {
-                    offsetList = userList.subList(offset, listSize);
+                    offsetList = new ArrayList<>();
                 }
-            } else {
-                offsetList = new ArrayList<>();
-            }
-            UserInfoList result = new UserInfoList();
-            result.setList(offsetList);
-            result.setCount(userList.size());
+                UserInfoList result = new UserInfoList();
+                result.setList(offsetList);
+                result.setCount(userList.size());
 
-            return Response.status(Response.Status.OK).entity(result).build();
+                return Response.status(Response.Status.OK).entity(result).build();
+            }
         } catch (UserStoreException e) {
             String msg = "Error occurred while retrieving the list of users using the filter : " + filter;
             log.error(msg, e);