IndexOutOfBoundsException on KotlinCopyMethod.shouldUsePublicCopyMethod(…) when saving single-property Kotlin data class with Association

[amreivcz-old]

I'm working in a project using Kotlin and JDBC for our service and I'm seeing the following exception when trying to save an object to the database:

java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
	at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:100)
	at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:106)
	at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302)
	at java.base/java.util.Objects.checkIndex(Objects.java:385)
	at java.base/java.util.ArrayList.get(ArrayList.java:427)
	at org.springframework.data.mapping.model.KotlinCopyMethod.shouldUsePublicCopyMethod(KotlinCopyMethod.java:177)

We're trying to save an aggregate that looks something like this:

@Table("some_aggregate")
data class SomeAggregate(
    @Id
    var id: UUID? = null,
    @MappedCollection(idColumn = "objectId")
    val objects: Set<SomeRelatedObject> = emptySet(),
) 

@Table("some_related_object")
data class SomeRelatedObject(
    val relatedObject: AggregateReference<ObjectAggregate, UUID>,
) 

The problem is with the SomeRelatedObject data class, since this has an empty persistentProperties, resulting from relatedObject being an Association. Therefore when iterating over parameterTypes, it throws the IndexOutOfBoundsException.

[mp911de]

That's fixed now. Care to test against the latest snapshots (note that you must explicitly specify the dependency version of spring-data-commons)?