MissingFieldException.kt

val formatExplicitExcludeNullsFalse = Json { explicitNulls = false }

val flutterExpert = Expert(id = 1, "Roman", Category.FLUTTER, null)

val jsonFlutterExpert = formatExplicitExcludeNullsFalse.encodeToString(flutterExpert)
println("Encoded FlutterExpert result: $jsonFlutterExpert")

val formatExplicitExcludeNullsTrue = Json { explicitNulls = true }
println("Decoded FlutterExpert: ${formatExplicitExcludeNullsTrue.decodeFromString<Expert>(jsonFlutterExpert)}")

/*
Exception in thread "main" kotlinx.serialization.MissingFieldException: 
Field 'publishedArticles' is required for type with serial name 'Expert', but it was missing
at kotlinx.serialization.internal.PluginExceptionsKt.throwMissingFieldException(PluginExceptions.kt:20)
*/