java exceptions not propagated through at / async

import x10.io.Console;

public class AsyncJavaThrowable {
    public static def main (args : Array[String]) {
        Console.OUT.println(1);
        try {
            at (here.next()) {
                throw new java.lang.RuntimeException("1");
            }
        } catch (e:java.lang.Throwable) {
            e.printStackTrace();
        }
        Console.OUT.println(2);
        try {
            finish async {
                throw new java.lang.RuntimeException("2");
            }
        } catch (e:Throwable) { // multiple exceptions here -- java exception packaged inside x10 exception
            e.printStackTrace();
        }
        Console.OUT.println("Done");
    }
}