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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.
Method references.
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.

Nashorn is compatible with ECMAScript 5.1

See column "JJS 1.8" in Kangax’s ECMAScript 5 compatibility table
Compare with column "JJS 1.8" in Kangax’s ECMAScript 6 compatibility table