content: package com.alibaba.fastjson2.issues;
  
  import com.alibaba.fastjson2.JSON;
  import lombok.Getter;
  import lombok.Setter;
  import lombok.experimental.Accessors;
  import org.junit.jupiter.api.Test;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  public class Issue605 {
      @Test
      public void test() {
          WinningInformationBo bo = new WinningInformationBo();
          bo.isSuccess = true;
          bo.wxId = "abc";
          bo.parems = new HashMap<>();
  
          String str = JSON.toJSONString(bo);
          assertEquals("{\"parems\":{},\"success\":true,\"wxId\":\"abc\"}", str);
  
          WinningInformationBo bo1 = JSON.parseObject(str, WinningInformationBo.class);
          assertEquals(bo.wxId, bo1.wxId);
          assertEquals(bo.isSuccess, bo1.isSuccess);
          assertEquals(bo.parems, bo1.parems);
      }
  
      @Test
      public void test1() {
          String str = "{\"parems\":null,\"success\":true,\"wxId\":\"abc\"}";
          WinningInformationBo bo1 = JSON.parseObject(str, WinningInformationBo.class);
          assertNull(bo1.parems);
      }
  
      @Setter
      @Getter
      @Accessors(chain = true)
      public static class WinningInformationBo{
          private boolean isSuccess;
          private String wxId;
          private Map<String, String> parems;
      }
  
      @Test
      public void test2() {
          String str = "{\"params\":null,\"success\":true,\"wxId\":\"abc\"}";
          Bean bo1 = JSON.parseObject(str, Bean.class);
          assertNull(bo1.params);
      }
  
      @Setter
      @Getter
      @Accessors(chain = true)
      public static class Bean {
          private Map<String, Integer> params;
      }
  
      @Test
      public void test3() {
          String str = "{\"params\":null,\"success\":true,\"wxId\":\"abc\"}";
          Bean bo1 = JSON.parseObject(str, Bean.class);
          assertNull(bo1.params);
      }
  
      @Setter
      @Getter
      @Accessors(chain = true)
      public static class Bean3 {
          private Map params;
      }
  }
  