Find elementts with stream api in pogo class - java-stream

Question

I want to find all numbers 5, 5.5, 6, 6.5 that have quantity not null
It's pogo of the first entity:
#Getter
#Setter
#NoArgsConstructor
#ToString
#EqualsAndHashCode
public class Box {
#SerializedName("id")
private Integer id;
#SerializedName("name")
private String name;
#SerializedName("sizes")
private List<Size> sizes = null;
#SerializedName("quantity")
private Integer quantity;
#SerializedName("quantityPerSize")
private List<QuantityPerSize> quantityPerSize;
}
It's pogo of the second entity.
#NoArgsConstructor
#Getter
#Setter
#ToString
#EqualsAndHashCode
public class QuantityPerSize {
#SerializedName("id")
private List<Integer> id = null;
#SerializedName("qty")
private Integer qty;
}
It's pogo of the therd entity
#NoArgsConstructor
#Getter
#Setter
#ToString
#EqualsAndHashCode
public class Size {
#SerializedName("id")
private Integer id;
#SerializedName("name")
private Name name;
#SerializedName("sizeOrder")
private Integer sizeOrder;
}
It's photo of response:
It's my code. How I can get 5,5.5 with qt not null?
box.stream()
.filter(p -> p.getName().equals("korob")).forEach(quantityPerSize -> {
if (quantityPerSize.getQty() != 0) {
log.debug(box.getSizes().stream().filter(size -> size.getId().equals(quantityPerSize.getId())).iterator().next().getName().getEn());
}
});