[vorg]

When Apache Groovy had dynamic types only, it was marketed as a complement to Java, but when Groovy 2 came along with static typing added, its backers started pitching it as a replacement for Java, even targeting Android. This endeavor was ultimately unsuccessful, though, and the programmer who wrote the static typing enhancements recently pulled out of Groovy's project management group at Apache. Groovy doesn't run on Android anywhere I know of, and converting large swaths of dynamic code to static using @CompileStatic doesn't work -- you need to repeatedly compile the code and add manual type conversions all over the place until it all runs OK.

Best use Groovy for dynamically typed scripty stuff only, and a JVM language built with static typing from the ground up for building the actual systems, such as Java, Scala, or Kotlin.