A venerable build system like Maven should support full build reproducibilty (i.e. producing bit a bit identical binaries from the same source).
As initiatives like https://reproducible-builds.org gain traction and the news of the recent Debian policy change to mandate this build behavior (see https://reproducible.alioth.debian.org/blog/posts/121/), this seems a feature that needs to be considered for inclusion into Maven core & core plugins.
There is an independent ongoing effort to support this feature and the author stated that he has found interest from maven project to integrate his work: https://github.com/Zlika/reproducible-build-maven-plugin/issues/6#issuecomment-325005883
I hope this issue helps kickstart the effort.