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Jackson Message Conversion - Allow Abstract Classes #1215

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@ryandanielspmc

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@ryandanielspmc

I am using Kotlin, and I have a sealed class as follows:

@JsonDeserialize(using = FooDeserializer::class)
sealed class Foo
data class FooA(val s: String) : Foo()
data class FooB(val l: Long) : Foo()

Then FooDeserializer handles determining whether to instantiate FooA or FooB. The Jackson ObjectMapper handles this situation no problem. But, the message conversion functionality around Jackson2JsonMessageConverter does not allow abstract classes, which is what Foo gets compiled to.

Please allow abstract classes and interfaces in the Jackson message conversion functionality. Let it be the responsibility of the Jackson ObjectMapper to handle this situation instead of preventing it.

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