Hi Charles,
Usually this is due to issues with the https://download.java.net box. Especially, if a subsequent build succeeds. Or if it is around Thursday, when the new early-access JDK is uploaded – but I can happen all the time.
Having said that, it’s been almost two years since I suggested to provide stable GA releases via a Travis-local cache and use my install-jdk.sh script (loading a fresh JDK from java.net every time) for EA versions, only. Java/JDK on Travis CI
Cheers,
Christian