Akka Quickstart: An illegal reflective access operation has occurred

When running the official Akka Quickstart on my Mac terminal, I get this error:

Getting org.scala-sbt sbt 1.2.8 ...
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.ivy.util.url.IvyAuthenticator (file:/Users/helios/eclipse-workspace/akka-quickstart-java/sbt-dist/bin/sbt-launch.jar) to field java.net.Authenticator.theAuthenticator
WARNING: Please consider reporting this to the maintainers of org.apache.ivy.util.url.IvyAuthenticator
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
reStart
  

Is this the intended result? How can I go about fixing this?