There exists a bug in jackson-kotlin-module. When trying to deserialize a CSV into a target class that contains a field that is a value class and
the ObjectMapper has a CsvSchema that has column reordering enabled, jackson will produce the following exception:
Exception in thread "main" com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "BAR_HEADER" (class net.marvk.FooWithValueClass), not marked as ignorable (2 known properties: "bar", "baz"])
at [Source: (StringReader); line: 2, column: 41] (through reference chain: net.marvk.FooWithValueClass["BAR_HEADER"])
at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:61)
at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:1153)
at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:2241)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1793)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperties(BeanDeserializerBase.java:1743)
at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:546)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1493)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:348)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:185)
at com.fasterxml.jackson.databind.MappingIterator.nextValue(MappingIterator.java:283)
at com.fasterxml.jackson.databind.MappingIterator.readAll(MappingIterator.java:323)
at com.fasterxml.jackson.databind.MappingIterator.readAll(MappingIterator.java:309)
at net.marvk.MainKt.main(Main.kt:20)
at net.marvk.MainKt.main(Main.kt)
This issue does not exist for data classes or if column reordering is disabled.
data class |
value class |
|
|---|---|---|
Column Reordering false |
✔ | ✔ |
Column Reordering true |
✔ | ❌ |
See src/main/kotlin/Main.kt for the code and src/test/kotlin/Test.kt for tests which demonstrate that data classes work whether column reordering is enabled
or not, and value classes work with column reordering disabled.