the following constantly throws a ClassCastException `class java.util.LinkedHashMap cannot be cast t...

# graphql-kotlin

[Marcus Dunn]

the following constantly throws a ClassCastException class java.util.LinkedHashMap cannot be cast to class com.expediagroup.graphql.examples.server.spring.query.ScalarQuery$PhoneNumber

fun convolutedExample(optListInput: OptionalInput<List<PhoneNumber>>): String {
        return patient
            .let { if (it is OptionalInput.Defined) it.value else null }
            ?.map { it.number }
            .toString()
    }

    data class PhoneNumber(val number: Long)

when called like this

@Test
fun test() {
    val query = "convolutedExample"
    val expectedData = "[111111]"

    <http://testClient.post|testClient.post>()
        .uri(GRAPHQL_ENDPOINT)
        .accept(APPLICATION_JSON)
        .contentType(GRAPHQL_MEDIA_TYPE)
        .bodyValue("""query { $query(optListInput: [{
            |   number: 111111,
            |   }]
            |) }""".trimMargin())
        .exchange()
        .verifyData(query, expectedData)
}

Have I gone wrong somewhere or is this just too many generics deep for jackson to figure out?

[Dariusz Kuc]

that error indicates that jackson doesn't understand how to correctly parse the input

[Dariusz Kuc]

can you provide a small example that reproduces this error?

[Dariusz Kuc]

*it might be the issue with OptionalInput wrapper

[Dariusz Kuc]

yeah I think it is probably an issue with optional input and a list

[Dariusz Kuc]

https://github.com/ExpediaGroup/graphql-kotlin/blob/master/generator/graphql-kotli[…]n/com/expediagroup/graphql/generator/execution/OptionalInput.kt I think this would get initialized with generic List information

[Marcus Dunn]

I've reproduced it in graphql-kotlin by only adding those two snippets I sent. Would you like me to make a PR with the added test?

[Dariusz Kuc]

yeah PR would be great

[Marcus Dunn]

made the PR, first PR so forgive the stumbling around the whole process.