mapper.add(new TypeA(3, "three")); mapper.add(new TypeB(1, 1.1f)); mapper.add(new TypeB(2, 2.2f)); mapper.add(new TypeB(3, 3.3f)); mapper.add(new TypeA(3, "four")); mapper.add(new TypeB(1, 1.1f)); mapper.add(new TypeB(2, 2.2f)); mapper.add(new TypeB(3, 4.4f)); mapper.add(new TypeA(3, "four")); mapper.add(new TypeB(2, 2.2f)); mapper.add(new TypeB(3, 4.4f));