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

For me the problem was that I used

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_10
    targetCompatibility JavaVersion.VERSION_1_10
}

but the project was configured for Java 1.8. So I changed these to 1_8 and it works.