Fix possible concurrent issues

commons/common-util/src/main/java/com/schbrain/common/util/JacksonUtils.java

 package com.schbrain.common.util;
 
+import cn.hutool.core.lang.Singleton;
 import cn.hutool.extra.spring.SpringUtil;
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.*;
@@ -27,6 +28,7 @@ public class JacksonUtils {
     private static ObjectMapper PRETTY_OBJECT_MAPPER;
 
     public static ObjectMapper getObjectMapper() {
+        return Singleton.get(JacksonUtils.class.getName(), () -> {
             if (OBJECT_MAPPER == null) {
                 // Delay to get ObjectMapper from spring container to keep the same behavior with application
                 try {
@@ -38,6 +40,7 @@ public class JacksonUtils {
                 OBJECT_MAPPER.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
             }
             return OBJECT_MAPPER;
+        });
     }
 
     public static ObjectMapper getPrettyObjectMapper() {