To build and test:
bazel test //...
To build a deployable jar:
bazel build //msggw:msggw_deploy.jar
The deployable jar is created as bazel-bin/msggw/msggw_deploy.jar. To run:
java -cp conf:bazel-bin/msggw/msggw_deploy.jar io.streaml.msggw.MessagingGatewayStarter