Merge branch 'gradle' into 'master'

Gradle

See merge request !13
4 jobs for master in 2 minutes and 32 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #29635
build:jdk8

00:01:07

failed #29634
allowed to fail
build:jdk9

00:00:38

 
  Test
failed #29636
test

00:00:45

 
  Deploy
skipped #29637
allowed to fail
deploy
 
Name Stage Failure
failed
test Test There is an unknown failure, please try again

* 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

BUILD FAILED in 35s
9 actionable tasks: 9 executed
ERROR: Job failed: exit code 1
failed
build:jdk9 Build There is an unknown failure, please try again

* 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

BUILD FAILED in 24s
1 actionable task: 1 executed
ERROR: Job failed: exit code 1