Running the following test program with -Xcomp will crash the VM.
This demonstrate a problem that can occur in real programs without
-Xcomp.

class Vbase {
    public void printer() {
      System.out.println("Vbase");
    }
}
class Vbase2 extends Vbase {
    public void printer() {
      System.out.println("Vbase2");
    }
}
  class Vbase3 extends Vbase {
    public void printer() {
      System.out.println("Vbase3");
    }
}
class VtableNull {

  public static void doprint(Vbase it) {
    try {
      it.printer();
    } catch (NullPointerException e) {
      throw new NullPointerException();
    }
}
   
  public static void main(String[] args) {
    Vbase2 vb_null = null;
    Vbase vb = new Vbase();
    Vbase2 vb2 = new Vbase2();
    Vbase3 vb3 = new Vbase3();
    doprint(vb);
    doprint(vb2);
    doprint(vb3);
    doprint(vb_null);
  }
}