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Java 8 was released 2014-03-18. Support from Oracle will end "not earlier than" January 2019.

Resources

What's New in Java 8 at Leanpub

Notable New Features

Lambda expressions.
static and default methods in interfaces.
Streams.
Optional (replacing Guava functionality)
Nashorn
New date and time API (replacing Joda-Time functionality)
Base64
Functional programming interfaces (replacing Guava functionality)

Lambda expressions are foundational for both the Stream and functional programming features.