nix-channel --add https://nixos.org/channels/nixos-19.09
nix-channel --update
nix-env -f ~/.nix-defexpr/channels/nixos-19.09 -iA emacs- 1. install and config maven
nix-env -f ~/.nix-defexpr/channels/nixos-19.09 -iA maven
cp maven-conf/settings.xml ~/.m2/settings.xml- 1. create maven project
mvn -B archetype:generate -DgroupId=larluo -DartifactId=data-ingestion -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeCatalog=local