content: package com.alibaba.fastjson2.codec;
  
  import com.alibaba.fastjson2.JSONB;
  import com.alibaba.fastjson2.JSONReader;
  import com.alibaba.fastjson2.JSONWriter;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Objects;
  
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  public class RefTest7 {
      @Test
      public void test_ref_0() {
          Value value = new Value();
          Bean bean = new Bean();
          bean.values = new HashMap<>();
          bean.values1 = new HashMap<>();
          bean.values.put(new Key(), value);
          bean.values1.put(new Key(), value);
  
          byte[] bytes = JSONB.toBytes(bean,
                  JSONWriter.Feature.WriteClassName,
                  JSONWriter.Feature.FieldBased,
                  JSONWriter.Feature.ReferenceDetection,
                  JSONWriter.Feature.WriteNulls,
                  JSONWriter.Feature.NotWriteDefaultValue,
                  JSONWriter.Feature.NotWriteHashMapArrayListClassName
          );
  
          JSONB.dump(bytes);
  
          Bean bean2 = (Bean) JSONB.parseObject(bytes,
                  Object.class,
                  JSONReader.Feature.SupportAutoType,
                  JSONReader.Feature.FieldBased,
                  JSONReader.Feature.UseNativeObject
          );
          assertNotNull(bean2);
          assertNotNull(bean2.values);
  
          Assertions.assertSame(bean.values.getClass(), bean2.values.getClass());
          Assertions.assertSame(bean2.values1.entrySet().iterator().next().getValue(), bean2.values.entrySet().iterator().next().getValue());
      }
  
      public static class Bean {
          Map<Key, Value> values;
          Map<Key, Value> values1;
      }
  
      public static class Value {
      }
  
      public static class Key {
          public int id;
  
          @Override
          public boolean equals(Object o) {
              if (this == o) {
                  return true;
              }
              if (o == null || getClass() != o.getClass()) {
                  return false;
              }
              Key key = (Key) o;
              return id == key.id;
          }
  
          @Override
          public int hashCode() {
              return Objects.hash(id);
          }
      }
  }
  