Run from your command line:
java -version
| Possible result | Explanation |
|---|---|
| Java Version >= 1.8.0u25) | You’re all good |
| Java Version < 1.8.0u25 | You need a newer JDK |
If you need to install or upgrade Java, start here:
http://www.oracle.com/technetwork/java/javase/downloads/index.html