java.lang.IllegalArgumentException: Expected unique result or null, but got more than one! - Spring Data Mongo

Question

I\'m usingSpring Boot v2.2.2.RELEASE and Spring Data MongoDB. In this example, I am looking perform group by department code and get all employees

Answer 1

Aggregations on repository methods do not support the Page return type. Please have a look at the Reference Documentation for supported return types (eg. List).

I created DATAMONGO-2506 to improve the error message in that case.