content: package com.alibaba.fastjson2.issues_2200;
  
  import com.alibaba.fastjson2.JSONB;
  import com.alibaba.fastjson2.JSONWriter;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class Issue2234 {
      @Test
      public void test() {
          Bean bean = new Bean();
          bean.f0 = null;
          bean.f1 = null;
          bean.f2 = null;
          bean.f3 = null;
          bean.f4 = null;
          bean.f5 = null;
          bean.f6 = null;
          bean.f7 = null;
  
          byte[] jsonb = JSONB.toBytes(bean, JSONWriter.Feature.WriteNulls, JSONWriter.Feature.FieldBased);
          assertEquals("{\n" +
                  "\t\"f0\":null,\n" +
                  "\t\"f1\":null,\n" +
                  "\t\"f2\":null,\n" +
                  "\t\"f3\":null,\n" +
                  "\t\"f4\":null,\n" +
                  "\t\"f5\":null,\n" +
                  "\t\"f6\":null,\n" +
                  "\t\"f7\":null\n" +
                  "}", JSONB.toJSONString(jsonb));
      }
  
      static class Bean {
          private Boolean f0 = true;
          private Byte f1 = 101;
          private Short f2 = 101;
          private Integer f3 = 102;
          private Long f4 = 103L;
          private Float f5 = 103F;
          private Double f6 = 103d;
          private Character f7 = 'a';
      }
  }
  