class JacksonConfig {
    @Bean
    @Primary
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {<FILL_FUNCTION_BODY>}
}

        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        // 通过该方法对mapper对象进行设置，所有序列化的对象都将按该规则进行系列化
        // Include.ALWAYS 默认
        // Include.NON_DEFAULT 属性为默认值不序列化
        // Include.NON_EMPTY 属性为空（""）或者为NULL都不序列化，返回的json是没有这个字段的
        // Include.NON_NULL 属性为NULL的字段不序列化
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        return objectMapper;
    
<no_super_class>