JDK 15 is unleashed!
One of its fine features is support for EdDSA (Edwards Curve Digital Signature Algorithm described in RFC8032), an elliptic curve signature scheme. The Edwards Curve is named after the late American mathematician Harold Edwards who graduated with a PhD in mathematics in 1961 from Harvard.
One of JDK 15's high-profile "subtractions"is the Nashorn JavaScript engine (which has been removed as per recommendation of JEP372). Nashorn has been declared "challenging to maintain" with the rapid development of the ECMAScript standard underlying JavaScript.
The Z Garbage Collector gets a boost from being a mere "experimental feature" to now becoming a "product feature" as per JEP377 (without altering the default GC which remains G1). Nod to 377 author Per Liden.