问题：Springboot MongoDB newObjectId java.lang.IllegalArgumentException: invalid hexadecimal representa

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描述：5c738ea8a28b504c04ae44ed来自于mongodb的_id字段，按理只是将string类型的ObjectId转换回ObjectId类型应该不会出错。

报错：java.lang.IllegalArgumentException: invalid hexadecimal representation of an ObjectId: ["5c738ea8a28b504c04ae44ed"]

报错原因：https://www.jianshu.com/p/50d2177d5e29?utm_campaign=maleskine&utm_content=note&utm_medium=seo_notes&utm_source=recommendation

解决办法：将ObjectId序列化一下

复制代码

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@JsonComponent
public class ObjectIdCombinedSerializer {
    public static class ObjectIdJsonSerializer extends JsonSerializer<ObjectId> {
        @Override
        public void serialize(ObjectId objectId, JsonGenerator jsonGenerator,
                              SerializerProvider serializerProvider) throws IOException {
            jsonGenerator.writeString(objectId.toString());

        }
    }
    public static class ObjectIdJsonDeserializer extends JsonDeserializer<ObjectId> {
        @Override
        public ObjectId deserialize(JsonParser parser, DeserializationContext deserializationContext)
                throws IOException {
            var node = (JsonNode)parser.getCodec().readTree(parser);
            return new ObjectId(node.asText());
        }
    }
}