Compile error with Java 26 - Ordering inherits conflicting members #769
Description
This code doesn't compile with the latest builds of JDK 26:
A recent JDK change JDK-8357219: Provide default methods min(T, T) and max(T, T) in Comparator interface adds default methods named min and max to the Comparator interface, which clash with existing methods inherited in Ordering, and cause the following error:
com/fasterxml/jackson/module/scala/introspect/OrderingLocator.scala:31: error: <$anon: Ordering[T]> inherits conflicting members:
<defaultmethod> def max[U <: T](o1: U, o2: U): U (defined in trait Comparator) and
def max[U <: T](x: U, y: U): U (defined in trait Ordering)
(note: this can be resolved by declaring an `override` in <$anon: Ordering[T]>.);
other members with override errors are: min
new Ordering[T] {
^
1 error
One possible fix is to explicitly declare min and max methods in the Ordering implementation, with the same behaviour as the conflicting inherited methods:
new Ordering[T] {
+ override def min[U <: T](x: U, y: U): U = if (compare(x, y) < 0) x else y
+ override def max[U <: T](x: U, y: U): U = if (compare(x, y) > 0) x else y
def compare(x: T, y: T): Int = {
x.asInstanceOf[Comparable[T]].compareTo(y)
}
}