content: package com.alibaba.fastjson2.issues_1900;
  
  import com.alibaba.fastjson2.JSON;
  import com.alibaba.fastjson2.JSONException;
  import com.alibaba.fastjson2.JSONObject;
  import com.alibaba.fastjson2.JSONReader;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class Issue1944 {
      @Test
      public void test() {
          JSONObject jsonObject = JSONObject.of("id", 123, "name", "xxx");
          String str = jsonObject.toJSONString();
          assertEquals(
                  jsonObject.getIntValue("id"),
                  JSON.parseObject(str, Bean.class).id);
          assertThrows(
                  JSONException.class,
                  () -> JSON.parseObject(str, Bean.class, JSONReader.Feature.ErrorOnUnknownProperties)
          );
  
          assertEquals(
                  jsonObject.getIntValue("id"),
                  jsonObject.toJavaObject(Bean.class).id
          );
          assertThrows(
                  JSONException.class,
                  () -> jsonObject.toJavaObject(Bean.class, JSONReader.Feature.ErrorOnUnknownProperties)
          );
      }
  
      public static class Bean {
          public int id;
      }
  }
  