FasterXML/jackson-module-scala (original) (raw)

Deserializing a tuple that contains Some values succeeds.
However, a MismatchedInputException will be thrown during deserialization If the tuple contains None values.

Version

• Scala 2.13.6
• jackson-databind 2.12.3
• jackson-module-scala 2.12.3

Actual behavior

The test case "deserialize OptionalTupleHolder that has 'None' values" fails.

package com.example

import com.fasterxml.jackson.databind.json.JsonMapper import com.fasterxml.jackson.module.scala.DefaultScalaModule import org.scalatest.funsuite.AnyFunSuite import org.scalatest.matchers.should.Matchers

object JacksonScalaSpec { final case class OptionalTupleHolder(tuple: (Option[Int], Option[String])) }

class JacksonScalaSpec extends AnyFunSuite with Matchers { import JacksonScalaSpec._

private val mapper = JsonMapper .builder() .addModule(DefaultScalaModule) .build()

println(mapper.version())

test("deserialize OptionalTupleHolder that has 'Some' values") { val obj = OptionalTupleHolder((Option(1), Option("2"))) val json = mapper.writeValueAsString(obj) println(json) // {"tuple":[1,"2"]} val deserialized = mapper.reyadValue(json, classOf[OptionalTupleHolder]) println(deserialized)

obj should be(deserialized)
// pass

}

test("deserialize OptionalTupleHolder that has 'None' values") { val obj = OptionalTupleHolder((Option.empty, Option.empty)) val json = mapper.writeValueAsString(obj) println(json) // {"tuple":[null,null]} val deserialized = mapper.readValue(json, classOf[OptionalTupleHolder]) // throws com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type java.lang.String from Null value (token JsonToken.VALUE_NULL) println(deserialized)

obj should be(deserialized)

} }

Details of MismatchedInputException

Cannot deserialize value of type `java.lang.String` from Null value (token `JsonToken.VALUE_NULL`)
 at [Source: (String)"{"tuple":[null,null]}"; line: 1, column: 16] (through reference chain: com.example.JacksonScalaSpec$OptionalTupleHolder["tuple"])
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `java.lang.String` from Null value (token `JsonToken.VALUE_NULL`)
 at [Source: (String)"{"tuple":[null,null]}"; line: 1, column: 16] (through reference chain: com.example.JacksonScalaSpec$OptionalTupleHolder["tuple"])
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1601)
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1375)
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1280)
    at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:73)
    at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:11)
    at com.fasterxml.jackson.module.scala.deser.OptionDeserializer.deserialize(OptionDeserializerModule.scala:61)
    at com.fasterxml.jackson.module.scala.deser.OptionDeserializer.deserialize(OptionDeserializerModule.scala:11)
    at com.fasterxml.jackson.module.scala.deser.TupleDeserializer.$anonfun$deserialize$1(TupleDeserializerModule.scala:48)
    at scala.collection.immutable.Vector1.map(Vector.scala:1886)
    at scala.collection.immutable.Vector1.map(Vector.scala:375)
    at com.fasterxml.jackson.module.scala.deser.TupleDeserializer.deserialize(TupleDeserializerModule.scala:45)
    at com.fasterxml.jackson.module.scala.deser.TupleDeserializer.deserialize(TupleDeserializerModule.scala:10)
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:542)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeWithErrorWrapping(BeanDeserializer.java:565)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:449)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1405)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:362)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:195)
    at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:322)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4593)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3548)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3516)
    at com.example.JacksonScalaSpec.$anonfun$new$2(JacksonScalaSpec.scala:38)

Expected behavior

The json {"tuple":[null,null]} is deserialized to OptionalTupleHolder((None, None)) without any Exceptions.