NoSuchElementException: head of empty list exception while trying to parse json string into scala case class

[aditya-ambient]

Hi folks,

I am facing an issue with json serialization using jackson-module-scala version 2.13.2. The stack trace, input json and the scala case class is attached below. Can anyone help me with finding the root cause for this.

Input

{"id": 1069, "snoozeAlerts": true, "autoverifyAlerts": false}

Scala case class

case class SecurityProfile(snoozeAlerts: Boolean, id: Int, autoverifyAlerts: Boolean) {}

And here is how I am using the mapper

        val mapper = new ObjectMapper()
        mapper.registerModule(DefaultScalaModule)
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
        mapper.setPropertyNamingStrategy(PropertyNamingStrategies.LOWER_CAMEL_CASE)
        mapper.readValue(input)

java.util.NoSuchElementException: head of empty list
	at scala.collection.immutable.Nil$.head(List.scala:469)
	at scala.collection.immutable.Nil$.head(List.scala:466)
	at scala.collection.immutable.List.flatMap(List.scala:366)
	at com.fasterxml.jackson.module.scala.introspect.ScalaAnnotationIntrospector$.$anonfun$hasCreatorAnnotation$1(ScalaAnnotationIntrospectorModule.scala:119)
	at com.fasterxml.jackson.module.scala.introspect.ScalaAnnotationIntrospector$.$anonfun$hasCreatorAnnotation$1$adapted(ScalaAnnotationIntrospectorModule.scala:117)
	at scala.Option.map(Option.scala:230)
	at com.fasterxml.jackson.module.scala.introspect.ScalaAnnotationIntrospector$.hasCreatorAnnotation(ScalaAnnotationIntrospectorModule.scala:117)
	at com.fasterxml.jackson.module.scala.introspect.ScalaAnnotationIntrospector$.findCreatorAnnotation(ScalaAnnotationIntrospectorModule.scala:138)
	at com.fasterxml.jackson.databind.introspect.AnnotationIntrospectorPair.findCreatorAnnotation(AnnotationIntrospectorPair.java:842)
	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector._addCreatorParam(POJOPropertiesCollector.java:651)
	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector._addCreators(POJOPropertiesCollector.java:618)
	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.collectAll(POJOPropertiesCollector.java:426)
	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.getPropertyMap(POJOPropertiesCollector.java:386)
	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.getProperties(POJOPropertiesCollector.java:233)
	at com.fasterxml.jackson.databind.introspect.BasicBeanDescription._properties(BasicBeanDescription.java:164)
	at com.fasterxml.jackson.databind.introspect.BasicBeanDescription.findProperties(BasicBeanDescription.java:239)
	at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory._findCreatorsFromProperties(BasicDeserializerFactory.java:328)
	at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory._constructDefaultValueInstantiator(BasicDeserializerFactory.java:272)
	at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory.findValueInstantiator(BasicDeserializerFactory.java:223)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:261)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.createBeanDeserializer(BeanDeserializerFactory.java:150)
	at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:415)
	at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:350)
	at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:264)
	at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
	at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
	at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:642)
	at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:4805)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4675)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3690)

[cowtowncoder]

Version 2.13.2 is ancient and no longer supported: please verify with something newer (2.19.2, 2.20.0).

[pjfanning]

What version of Scala are you using? scala.collection.immutable.List.flatMap shouldn't blow up on empty lists like your Scala version is doing. Seems quite possible that you are using an old version of scala-library that has a bug in it.