The most significant feature in Bean Validation 2.0 (JSR 380) is the support for container element constraints.
I.e. you can now apply constraints to the contents of container types such as List, Map or Optional by annotating their type arguments
(which became possible with Java 8): List<@Future LocalDate> shipmentDates.
In this blog post you’ll learn how to take advantage of that for the validation of custom container types,
such as Multimap, Table or Graph from Google’s widely known Guava library.