springboot集成redis，使用jackson序列化方案报Type id handling not implemented for 错误问题处理

使用序列化类：GenericJackson2JsonRedisSerializer

错误信息：

Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Type id handling not implemented for type java.lang.Object (by serializer of type com.fasterxml.jackson.databind.ser.impl.UnsupportedTypeSerializer) (through reference chain: java.util.ArrayList[0]->xxx.xx.xx.xx["createTime"])
	at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1300) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.DatabindContext.reportBadDefinition(DatabindContext.java:400) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.JsonSerializer.serializeWithType(JsonSerializer.java:160) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:730) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:774) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeWithType(BeanSerializerBase.java:657) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeTypedContents(IndexedListSerializer.java:181) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:92) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:18) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serializeWithType(AsArraySerializerBase.java:267) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.impl.TypeWrappedSerializer.serialize(TypeWrappedSerializer.java:32) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ObjectMapper._writeValueAndClose(ObjectMapper.java:4568) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsBytes(ObjectMapper.java:3844) ~[jackson-databind-2.13.3.jar!/:2.13.3]
	at org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer.serialize(GenericJackson2JsonRedisSerializer.java:123) ~[spring-data-redis-2.7.0.jar!/:2.7.0]
	... 30 more

 参考：​​​​​​https://blog.csdn.net/Ellen_Tangxiang/article/details/111310153

参考：json - Jackson serialization failing when upgrading from 2.10 (InvalidDefinitionException: Type id handling not implemented for type java.lang.Object) - Stack Overflow

在参考其他的一些博客后

给到些想法，可以重新定义下 ObjectMapper 对象，使其兼容不可序列化的类型

重写objectMap，然后覆盖默认的

 
    public ObjectMapper getObjectMapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
        mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ISO_DATE_TIME));
        mapper.registerModule(javaTimeModule);
        mapper.registerModule(new Jdk8Module());
        mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        mapper.setTimeZone(Calendar.getInstance().getTimeZone());
//        mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
        mapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
        return mapper;
    }
 
 public RedisTemplate<String, Object> redisTemplate(int db) {
        //为了开发方便，一般直接使用<String,Object>
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(redisConnection(db)); //设置连接
 
        template.setDefaultSerializer(new StringRedisSerializer());
 
        // 使用 GenericFastJsonRedisSerializer 替换默认序列化
        //这里覆盖默认的ObjectMapper
        GenericJackson2JsonRedisSerializer genericFastJsonRedisSerializer = new GenericJackson2JsonRedisSerializer(getObjectMapper());
        // 设置key和value的序列化规则
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(genericFastJsonRedisSerializer);
        // 设置hashKey和hashValue的序列化规则
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setHashValueSerializer(genericFastJsonRedisSerializer);
        // 设置支持事物
//        template.setEnableTransactionSupport(true);
 
        template.afterPropertiesSet();
        return template;
    }

但是经过测时候，解决开篇的报错信息，但是Jackson序列化对象，保存在reids时。保存的完整json数据格式，存入redis的对象信息反序列化后，全部变成了 hashmap接口，导致业务处理报错

java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to com.xx.xx.xx

j经过查询后 ObjectMapper没有配置DefaultTyping属性，jackson将使用简单的数据绑定具体的java类型，其中Object就会在反序列化的时候变成LinkedHashMap......

再回过头来看下xml中的json序列化实现类

代码编写时发现方法已过期，找到了替代的方法，创建object Mapper，设置 其属性。完全解决了所有问题，代码经过测试

//过期的方法
//        mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
 
//替换方法
        mapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);