What is the difference between findById() and existsById() in Spring Data 2.0?
Solution 1:
According to documentation:
existsById(ID id) - returns boolean
Returns whether an entity with the given id exists.
findById(ID id) - returns Optional (object)
Retrieves an entity by its id.
Simple as that - findById() returns object, which you are searching for, existsById() returns true/false whether or not entity exists in repository.