java 12 is not working

[nedijahij]

After clone the project, then I execute:

cd KotlinLanguageServer/
./gradlew server:build

And then error output as following:

Downloading https://services.gradle.org/distributions/gradle-4.6-bin.zip
......................................................................
Unzipping /home/yourpc/.gradle/wrapper/dists/gradle-4.6-bin/4jp4stjndanmxuerzfseyb6wo/gradle-4.6-bin.zip to /home/yourpc/.gradle/wrapper/dists/gradle-4.6-bin/4jp4stjndanmxuerzfseyb6wo
Set executable permissions for: /home/yourpc/.gradle/wrapper/dists/gradle-4.6-bin/4jp4stjndanmxuerzfseyb6wo/gradle-4.6/bin/gradle

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine java version from '12.0.1'.

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

* Get more help at https://help.gradle.org
[yourpc@yourpc KotlinLanguageServer]$ ./gradlew server:build

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine java version from '12.0.1'.

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

* Get more help at https://help.gradle.org
[yourpc@yourpc KotlinLanguageServer]$ ./gradlew server:run

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine java version from '12.0.1'.

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

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

[fwcd]

Duplicate of #108, Java 11+ support will be coming soon in #109.