<dependency>
<groupId>org.grails</groupId>
<artifactId>grails-async</artifactId>
<version>3.2.8</version>
</dependency>
compile
|-- org.codehaus.groovy:groovy:2.4.10
|-- org.slf4j:slf4j-api:1.7.22
|-- org.slf4j:jcl-over-slf4j:1.7.22
|-- org.codehaus.gpars:gpars:1.2.1
|-- io.projectreactor:reactor-core:2.0.8.RELEASE
|-- io.projectreactor:reactor-stream:2.0.8.RELEASE
test
|-- org.codehaus.groovy:groovy-test:2.4.10
|-- junit:junit:4.12