title: What are jvm pre-allocated exceptions?
body: <p>I see references to pre-allocated JVM exceptions there:
  - <a href="http://www.oracle.com/technetwork/java/javase/relnotes-139183.html" rel="nofollow noreferrer">http://www.oracle.com/technetwork/java/javase/relnotes-139183.html</a>
  - <a href="http://dev.clojure.org/display/community/Project+Ideas+2016" rel="nofollow noreferrer">http://dev.clojure.org/display/community/Project+Ideas+2016</a></p>
  
  <p>But looking for that I see only information about missing stacktraces.
  What are JVM allocated exceptions? It seems like an optimisation.</p>
  
  <p>How does it work, and what are it's trade-offs?</p>