diff --git a/server/src/main/java/com/ecep/contract/service/WebSocketServerCallbackManager.java b/server/src/main/java/com/ecep/contract/service/WebSocketServerCallbackManager.java
index 4e974bb..17bf0b9 100644
--- a/server/src/main/java/com/ecep/contract/service/WebSocketServerCallbackManager.java
+++ b/server/src/main/java/com/ecep/contract/service/WebSocketServerCallbackManager.java
@@ -20,6 +20,7 @@ import com.ecep.contract.PageArgument;
 import com.ecep.contract.PageContent;
 import com.ecep.contract.QueryService;
 import com.ecep.contract.SpringApp;
+import com.ecep.contract.constant.ServiceConstant;
 import com.ecep.contract.constant.WebSocketConstant;
 import com.ecep.contract.handler.SessionInfo;
 import com.ecep.contract.model.Voable;
@@ -95,15 +96,15 @@ public class WebSocketServerCallbackManager {
         JsonNode argumentsNode = jsonNode.get(WebSocketConstant.ARGUMENTS_FIELD_NAME);
 
         Object result = null;
-        if (methodName.equals("findAll")) {
+        if (methodName.equals(ServiceConstant.FIND_ALL_METHOD_NAME)) {
             result = invokerFindAllMethod(service, argumentsNode);
-        } else if (methodName.equals("findById")) {
+        } else if (methodName.equals(ServiceConstant.FIND_BY_ID_METHOD_NAME)) {
             result = invokerFindByIdMethod(service, argumentsNode);
-        } else if (methodName.equals("save")) {
+        } else if (methodName.equals(ServiceConstant.SAVE_METHOD_NAME)) {
             result = invokerSaveMethod(service, argumentsNode);
-        } else if (methodName.equals("delete")) {
+        } else if (methodName.equals(ServiceConstant.DELETE_METHOD_NAME)) {
             result = invokerDeleteMethod(service, argumentsNode);
-        } else if (methodName.equals("count")) {
+        } else if (methodName.equals(ServiceConstant.COUNT_METHOD_NAME)) {
             result = invokerCountMethod(service, argumentsNode);
         } else {
             result = invokerOtherMethod(service, methodName, argumentsNode);