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class Product {
String name;
String type;
int actualAmount;
int goalAmount;
}

class Beer extends Product {
int liters;
int percentage;
}

class Chips extends Product {
int weight;
String taste;
}

class ProductService {
private final ProductRepository repo;

//Send parent to method then getAll similar products by child variables.
public void foo(Product product) {
if (product instanceof Beer) {
Beer beer = (Beer) product;
List fromDb = repo.findAllByPercentage(beer.getPercentage());
}

else if (product instanceof Chips) {
Chips chips = (Chips) product;
List fromDb = repo.findAllByTaste(chips.getTaste());
}
}
}