Span and other data models used by Haystack are defined as Protocol Buffer files in proto folder
A simple maven pom file is available in java folder to compile Haystack proto files in to a jar
Simple utility in Go to generate and send sample Spans to Kakfa is in fakespans folder
docker run --rm -it -v "$PWD":/usr/src/app -w /usr/src/app golang:1.8 /usr/src/app/build.sh