I get an error downloading javax.media.jai_core:1.1.3 from maven central.
The error is:
download failed: javax.media#jai_core;1.1.3!jai_core.jar
using play compiler.
The problem at this moment is that maven-central doesn't have the .jar, which is a dependency from geotoolkit
If you need it, you could use the next public repositories:
https://maven.geotoolkit.org (jai-core is here)
https://repo.osgeo.org/repository/release/
Make sure geotoolkit-repo is before Maven Central, so that it resolves before Central which misses the jar.