gradle java9 Could not target platform: 'Java SE 9' using tool chain: 'JDK 8 (1.8)'

Question

I want to use java9 on my gradle project inside eclipse oxygen. When I run:

Run as> Gradle Test on  GreeterTest.java

with the followin

Answer 1

From what I can see, it is the Gradle version issue. (Gradle and Java 9 compatibility issue).

You need to upgrade the wrapper to 4.3.1, cli ref:

# upgrade Gradle to 4.3.1 
gradle wrapper --gradle-version 4.3.1 # not ./gradlew

Let me know if that works.