Wildcard upper type bounds in Scala and Java

Errors when compiling

JavaTest.java:11: g(java.lang.Class<? extends java.lang.Iterable<?>>) in ScalaTest cannot be applied to (java.lang.Class<java.util.ArrayList>)
        ScalaTest.g(ArrayList.class);
                 ^
JavaTest.java:15: <T>f(java.lang.Class<T>) in ScalaTest cannot be applied to (java.lang.Class<java.lang.Object>)
        ScalaTest.f(Object.class);
                 ^
JavaTest.java:16: g(java.lang.Class<? extends java.lang.Iterable<?>>) in ScalaTest cannot be applied to (java.lang.Class<java.lang.Object>)
        ScalaTest.g(Object.class);
                 ^
JavaTest.java:17: <T>f(java.lang.Class<T>) in JavaTest cannot be applied to (java.lang.Class<java.lang.Object>)
        JavaTest.f(Object.class);
                ^
JavaTest.java:18: g(java.lang.Class<? extends java.lang.Iterable>) in JavaTest cannot be applied to (java.lang.Class<java.lang.Object>)
        JavaTest.g(Object.class);
                ^
5 errors

JavaTest.java

import java.util.ArrayList;
import java.lang.Iterable;

public class JavaTest {
    public static <T extends Iterable> void f(Class<T> x) {}
    public static void g(Class<? extends Iterable> x) {}

    public static void main(String[] args) {
        // Should compile:
        ScalaTest.f(ArrayList.class);
        ScalaTest.g(ArrayList.class);
        JavaTest.f(ArrayList.class);
        JavaTest.g(ArrayList.class);
        // Should fail:
        ScalaTest.f(Object.class);
        ScalaTest.g(Object.class);
        JavaTest.f(Object.class);
        JavaTest.g(Object.class);
    }
}

ScalaTest.scala

import java.lang.Iterable

object ScalaTest {
    def f[T <: Iterable[_]](x : Class[T]) {}
    def g(x : Class[_ <: Iterable[_]]) {}
}

The Java type Class<? extends Iterable> is not equivalent to Class<? extends Iterable<?>>. The Scala type Class[_ <: Iterable[_] appears to be equivalent to Class<? extends Iterable<?>>, but the Java type Class<? extends Iterable> appears to have no direct Scala equivalent.

The same compilation error occurs if the Java method JavaTest.g() is redefined as

public static void g(Class<? extends Iterable<?>> x) {}

so this is not a Scala issue.