Testing locally:
$ ./mvnw clean install dockerfile:build
$ docker run -ti -p 8080:8080 -v `pwd`/target/test-classes:/classes projectriff/java-function-invoker:0.0.5-sr.1 --function.uri='file:classes?handler=io.projectriff.functions.Doubler'Then
$ curl -v localhost:8080 -H "Content-Type: text/plain" -d 5
10