*phg@ubuntu:~/gateway-model$ javac -version javac ...

# dokka

[raj]

*phg@ubuntu:~/gateway-model$ javac -version
javac 1.8.0_222
phg@ubuntu:~/gateway-model$ java -version
openjdk version "1.8.0_222"
OpenJDK Runtime Environment (build 1.8.0_222-8u222-b10-1ubuntu1~18.04.1-b10)
OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)
phg@ubuntu:~/gateway-model$ ./gradlew build --info

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileKotlin'.> Kotlin could not find the required JDK tools in the Java installation '/usr/lib/jvm/java-8-openjdk-amd64/jre' used by Gradle. Make sure Gradle is running on a JDK, not JRE.

* Try:
Run with --stacktrace option to get the stack trace. Run with --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.5/userguide/command_line_interface.html#sec:command_line_warnings * (edited)

[Kamil Doległo]

Make sure Gradle is running on a JDK, not JRE
Java installation '/usr/lib/jvm/java-8-openjdk-amd64/jre'