How can I provide a scala companion object's class to Java? - scala

Question

I have a Java code that looks for annotations in static methods of a class.
processor.readStatics( MyClass.class ); // Takes Class<?>
How can I provide the methods of a scala companion object to this function from within scala?
class MyClass {
}
object MyClass {
def hello() { println("Hello (object)") }
}
I seems that:
MyClass$.MODULE$.getClass()
should be the answer. However, MyClass$ seems to be missing from scala (in 2.10, at least) and only visible to Java.
println( Class.forName("MyClass$.MODULE$") )
also fails.

Answer 1

Class name is MyClass$ (with the appropriate package name prepended).
println(Class.forName("MyClass$")) will print out "class MyClass$".
MyClass$.MODULE$ is the instance of the class, referencing the singleton object.
println(MyClass$.MODULE$ == MyClass) will print out "true" even though, when compiling, you will get a warning that this comparison always yields false :)
Note, that none of this works in repl for some reason. You need to actually create a .scala file, compile it with scalac, and run.
So, in java, use MyClass$ to reference the class of MyClass object statically, use MyClass$.MODULE$ to reference the singleton instance of MyClass object, use MyClass$.class or MyClass$.MODULE$.getClass() to reference the class of the singleton object dynamically, use Class.forName("MyClass$") to access it at runtime by name.

Answer 2

The shortest and type-safest solution is to simply use
MyClass.getClass
I would have hoped the following to work, but apparently scalac is not happy with it:
classOf[MyClass.type]