Are you familiar with Java Validation API? And Spring validation? (if not, take a look at the end of this article for links to read)
In my practice I had an interesting case. The task was to implement an web endpoint accepting the request which body consisted of three fields. And only one of them must be specified at the time.
Most of Enterprise projects are about money. And most of them implement an API.
API implements the way the datum are migrating from one application to another one. The money consists of an amount and a currency. The amount may be fractional.
So this post is about how to deal with fractional amount of money when implementing an API in Java.