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I am not sure what `AbstractResourceAssemblerSupport` is (I see you are using spring-hateaos 0.25.0, in 0.25.2 there is a class called `ResourceAssemblerSupport` which seems to do the same), but probably you can override the `instantiateResource` method in your assembler

<https://github.com/spring-projects/spring-hateoas/blob/0.25.0.RELEASE/src/main/java/org/springframework/hateoas/mvc/ResourceAssemblerSupport.java#L102>

then you can call your constructor, which you can thus adapt for non-nullable fields

Just sent the scrernshot of AbstractResourceSupport

same suggestion, override `instantiateResource` calling your constructor directly in `PaymentDetailAssembler`

and please, avoid screenshots and thread, it is pointless to spam the whole channel

<@U0QAY96MA> so I could make it work by adding following code snippet

``` override fun instantiateResource(entity: PaymentDetailDao): PaymentDetail {
        return PaymentDetail(externalPaymentId = -1)
    }```

I made externalPaymentId  nullable. But I am now assigning a default value to the field , which does not make sense.

you have entity to populate from, like `return PaymentDetail(externalPaymentId = entity.externalId)`. if all fields are nullable you have to fallback to defaults though.