This is the output of gradlew --version; it also reports that jav 1.8. is used:
./gradlew --version
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Gradle 2.14
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Build time: 2016-06-14 07:16:37 UTC
Revision: cba5fea19f1e0c6a00cc904828a6ec4e11739abc
Groovy: 2.4.4
Ant: Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM: 1.8.0-ea (Oracle Corporation 24.0-b20)
OS: Mac OS X 10.11.5 x86_64