Object[] objects = new Object[4];
Alternative1 a1 = new Alternative1();
a1.setChalk("blackboard");
objects[0] = a1;
objects[1] = null;
Alternative2 a2 = new Alternative2();
a2.setCheese(42);
objects[2] = a2;
a1 = new Alternative1();
a1.setChalk("sidewalk");
objects[3] = a1;
r.getAny().addAll(Arrays.asList(objects));