content: package com.alibaba.fastjson2.autoType;
  
  import com.alibaba.fastjson2.JSONB;
  import com.alibaba.fastjson2.JSONReader;
  import com.alibaba.fastjson2.JSONWriter;
  import org.junit.jupiter.api.Test;
  
  import java.util.HashMap;
  import java.util.LinkedHashMap;
  import java.util.Map;
  import java.util.Objects;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  public class AutoTypeTest21 {
      @Test
      public void test_1() throws Exception {
          Item item = new Item(101);
          Bean1 bean = new Bean1();
          bean.item = item;
  
          bean.values = new LinkedHashMap<>();
          bean.values.put(item, "101");
  
          bean.values2 = new LinkedHashMap<>();
          bean.values2.put(item, "101");
  
          byte[] bytes = JSONB.toBytes(bean, JSONWriter.Feature.WriteClassName, JSONWriter.Feature.FieldBased, JSONWriter.Feature.ReferenceDetection);
  
          JSONB.dump(bytes);
  
          Bean1 bean2 = (Bean1) JSONB.parseObject(bytes, Object.class, JSONReader.Feature.SupportAutoType, JSONReader.Feature.FieldBased);
          assertNotNull(bean2);
          assertNotNull(bean2.values);
          assertEquals(bean.values.getClass(), bean2.values.getClass());
          assertEquals(bean.values.size(), bean2.values.size());
  
          assertEquals(bean2.item, bean2.values.keySet().iterator().next());
          assertEquals(bean2.item, bean2.values2.keySet().iterator().next());
      }
  
      public static class Bean1 {
          Item item;
          Map<Item, String> values;
          Map<Item, String> values2;
  
          public Bean1() {
          }
      }
  
      public static class Item {
          public int id;
  
          public Item(int id) {
              this.id = id;
          }
  
          @Override
          public boolean equals(Object o) {
              if (this == o) {
                  return true;
              }
              if (o == null || getClass() != o.getClass()) {
                  return false;
              }
              Item item = (Item) o;
              return id == item.id;
          }
  
          @Override
          public int hashCode() {
              return Objects.hash(id);
          }
      }
  
      @Test
      public void test_1_x() throws Exception {
          Item item = new Item(101);
          Bean1 bean = new Bean1();
          bean.item = item;
  
          bean.values = new HashMap<>();
          bean.values.put(item, "101");
  
          bean.values2 = new HashMap<>();
          bean.values2.put(item, null);
  
          byte[] bytes = JSONB.toBytes(bean, JSONWriter.Feature.WriteClassName, JSONWriter.Feature.FieldBased, JSONWriter.Feature.ReferenceDetection, JSONWriter.Feature.WriteNulls, JSONWriter.Feature.WriteNameAsSymbol);
  
          JSONB.dump(bytes);
  
          assertEquals("{\n" +
                  "\t\"@type\":\"com.alibaba.fastjson2.autoType.AutoTypeTest21$Bean1#0\",\n" +
                  "\t\"@value\":{\n" +
                  "\t\t\"item#1\":{\n" +
                  "\t\t\t\"id#2\":101\n" +
                  "\t\t},\n" +
                  "\t\t\"values#3\":{\n" +
                  "\t\t\t\"@type\":\"M#4\",\n" +
                  "\t\t\t\"@value\":{\n" +
                  "\t\t\t\t{\n" +
                  "\t\t\t\t\t\"@type\":\"com.alibaba.fastjson2.autoType.AutoTypeTest21$Item#5\",\n" +
                  "\t\t\t\t\t\"@value\":{\n" +
                  "\t\t\t\t\t\t\"#2\":101\n" +
                  "\t\t\t\t\t}\n" +
                  "\t\t\t\t}:\"101\"\n" +
                  "\t\t\t}\n" +
                  "\t\t},\n" +
                  "\t\t\"values2#6\":{\n" +
                  "\t\t\t\"@type\":\"#4\",\n" +
                  "\t\t\t\"@value\":{\n" +
                  "\t\t\t\t{\"$ref\":\"$.item\"}:null\n" +
                  "\t\t\t}\n" +
                  "\t\t}\n" +
                  "\t}\n" +
                  "}", JSONB.toJSONString(bytes, true));
  
          Bean1 bean2 = (Bean1) JSONB.parseObject(bytes, Object.class, JSONReader.Feature.SupportAutoType, JSONReader.Feature.FieldBased);
          assertNotNull(bean2);
          assertNotNull(bean2.values);
          assertEquals(bean.values.getClass(), bean2.values.getClass());
          assertEquals(bean.values.size(), bean2.values.size());
  
          assertEquals(bean2.item, bean2.values.keySet().iterator().next());
          assertEquals(bean2.item, bean2.values2.keySet().iterator().next());
      }
  
      public static class Bean2 {
          Item item;
          Map values;
          Map values2;
      }
  
      @Test
      public void test_2() throws Exception {
          Item item = new Item(101);
          Bean2 bean = new Bean2();
          bean.item = item;
  
          bean.values = new HashMap<>();
          bean.values.put(item, "101");
  
          bean.values2 = new HashMap<>();
          bean.values2.put(item, null);
  
          byte[] bytes = JSONB.toBytes(bean, JSONWriter.Feature.WriteClassName, JSONWriter.Feature.FieldBased, JSONWriter.Feature.ReferenceDetection, JSONWriter.Feature.WriteNulls);
  
          JSONB.dump(bytes);
  
          Bean2 bean2 = (Bean2) JSONB.parseObject(bytes, Object.class, JSONReader.Feature.SupportAutoType, JSONReader.Feature.FieldBased);
          assertNotNull(bean2);
          assertNotNull(bean2.values);
          assertEquals(bean.values.getClass(), bean2.values.getClass());
          assertEquals(bean.values.size(), bean2.values.size());
  
          assertEquals(bean2.item, bean2.values.keySet().iterator().next());
          assertEquals(bean2.item, ((Map.Entry) bean2.values2.entrySet().iterator().next()).getKey());
      }
  }
  