bwyn is a tool aimed at multi-modules Maven projects with very long build times.
Often we lose time building them entirely even if we just modified some classes. bwyn relies on Git to determine what modules have been impacted by our changes and only them (and the modules that depend upon them).
How does it work? You simply use bwyn instead of mvn to build your project:
bwyn clean installThe first time it runs, bwyn will build the entire project, as would mvn. It'll then store the Git references that was built in .bwyn/lastBuild.
After that, it'll use that reference to determine impacted modules and build only them so that bwyn clean install translates into mvn clean install --projects module-a,module-b --also-make-dependents (or mvn clean install --pl module-a,module-b -amd if using abbreviated options).
It's also possible to provide --from=<git_ref> and --to=<git_ref> options which allows you to control where bwyn is looking for changes. --to reference will then be saved in .bwyn/lastBuild.
To install bwyn, follow these instructions:
- Download the bwyn bash script (or copy the content to a local file)
- Add the directory containing the file to your
PATH - Open a terminal (Linux/Unix only, for Windows see WSL, MinGW or Cygwin) and
cdinto your project workspace - Run
bwynas you wouldmvn(it only works for multi-modules project for now)