have u debug it ? add autowire of objectMapper and you will see what kind of mapper u have - 1st ru...

# spring

[mp]

have u debug it ?
add autowire of objectMapper and you will see what kind of mapper u have - 1st rule if you can ask compiler 😁
@poohbar pls continue in thread - we won't be verbose in channel

[poohbar]

I autowired ObjectMmapper

[poohbar]

mapper._registeredModuleTypes

[poohbar]

0 = "com.fasterxml.jackson.module.kotlin.KotlinModule"
1 = "org.springframework.boot.jackson.JsonComponentModule"

[poohbar]

so it seems like the module is there

[poohbar]

now the question is whether the @PostMapping method uses the same mapper.. I would hope it does

[poohbar]

the other question is why would it throw 😄

[poohbar]

When I debug what spring does with the incoming data it goes directly into BeanUtils and tries to instantiate it using the no-arg constructor

[poohbar]

oh I guess it does not use jackson at all!

[poohbar]

because it's POST form-data

[mp]

probably now you should read about Jackson2ObjectMapperBuilder

[mp]

https://stackoverflow.com/questions/28324352/how-to-customise-the-jackson-json-mapper-implicitly-used-by-spring-boot

[mp]

for example this thread

[mp]

https://docs.spring.io/spring-boot/docs/current/reference/html/howto-spring-mvc.html#howto-customize-the-jackson-objectmapper