TypeReference is an abstract class, so when you do new TypeReference<Foo> {}, Jackson depends on Java creating a new class that extends TypeReference. Then it gets the class inside the constructor using recursion. But I guess the compiler doesn't bother extending TypeReference<T> in the generated class, it just extends the raw type? 
The date is 9/10/2021 in most parts of the world.
To commemorate this special occasion, write a program to add 2 numbers, which mathematically should always return the correct answer but due to things such as double precision errors.
Implement Unix Timestamp to Daytime
Given an unsigned integer that represents a timestamp sice 1970/01/01 00:00:00, output one of these:
An array that stores year, month, date, hour, minute, second.
A string in format YYYYMMDDHHmmss.
Or whatever similar, as long as it complies with standard i/o ...
