Current Java 9 status and roadmap

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I spent another hour and found gradle#1095 - while that issue is about running tests it answered my question about TravisCI Java9 vs latest and greatest.

I tried the workaround by setting env variable to force-open java.lang as follows:

export GRADLE_OPTS=--add-opens java.base/java.lang=ALL-UNNAMED
gradlew tasks

At first it didn’t make a difference until I scratched my head some more and carefully read the output:

FAILURE: Build failed with an exception.

* What went wrong:
Unable to start the daemon process.   //                              <== IMPORTANT
This problem might be caused by incorrect configuration of the daemon. // READ THE LINE ABOVE
For example, an unrecognized jvm option is used.
Please refer to the user guide chapter on the daemon at https://docs.gradle.org/3.3/userguide/gradle_daemon.html
Please read the following process output to find out more:
-----------------------

FAILURE: Build failed with an exception.

* What went wrong:
java.lang.ExceptionInInitializerError (no error message)

Then I tried:

gradlew --no-daemon tasks
...
:buildSrc:build UP-TO-DATE  // IT'S WORKING!!!

FAILURE: Build failed with an exception. // almost...

* Where:
Build file '.../build.gradle' line: 19

* What went wrong:
An exception occurred applying plugin request [id: 'com.jfrog.artifactory', version: '4.4.8']
> Failed to apply plugin [id 'com.jfrog.artifactory']
   > No signature of method: static java.util.Collections.newSetFromMap() is applicable for argument types: (java.util.concurrent.ConcurrentHashMap) values: [[:]]

I just did a quick test and it appears that Groovy has problems dispatching some calls when ran under Java9. As a quick test I run this in the Groovy shell:

Collections.newSetFromMap([:])

It fails in Groovy 2.4.7 + Java9 with the same exception as above, but succeeds in 2.4.8 + Java9.

Any chance we can get a Gradle Groovy version upgrade for 3.4?