Saving json array into postgresql data using spring boot java API - spring-boot

Question

I have a Json Array in my request object and POJO object, I need to save that jsonarray field into jsonb column in my postgresql table.
"productId": "1",
"product":[
{
"name": "PENCIL",
"quantity":"5"
}]
I am getting an exception when trying to hit it via postman, getting exception:
Type definition error: [simple type, class io.r2dbc.postgresql.codec.Json]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of io.r2dbc.postgresql.codec.Json (no Creators, like default constructor, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information\n at [Source: (io.netty.buffer.ByteBufInputStream); l

Answer 1

Create a converter for reading and a converter for writing, thus it will convert between your type and Postgres io.r2dbc.postgresql.codec.Json.
#ReadingConverter
#RequiredArgsConstructor
public class JsonToYourTypeConverter implements Converter<Json, YourType > {
private final ObjectMapper objectMapper;
#Override
public YourType convert(Json json) {
}
}
#WritingConverter
#RequiredArgsConstructor
public class YourTypeToJsonConverter implements Converter<YourType, Json > {
private final ObjectMapper objectMapper;
#Override
public Json convert(YourType data) {
}
}
Then register your converters via R2dbcCustomConversions bean.
#Bean
public R2dbcCustomConversions r2dbcCustomConversions(ConnectionFactory connectionFactory, ObjectMapper objectMapper) {
var dialect = DialectResolver.getDialect(connectionFactory);
var converters = List.of(
new JsonToYourTypeConverter(objectMapper),
new YourTypeToJsonConverter(objectMapper),
);
return R2dbcCustomConversions.of(dialect, converters);
}