Hi,

During a rebuild of all packages in stretch (in a stretch chroot, not a
sid chroot), your package failed to build on i386.

Relevant part (hopefully):
http://aws-logs.debian.net/2017/04/18/android-platform-external-doclava_6.0.1+r55-1_testing-i386.log

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.

my guess is that this rebuild was done with limited RAM, since the
failure is:

"The system is out of resources."

This is an "Architecture: all" package that should not be built on a
machine with limited RAM.  This is unfortunately a common problem with
gradle builds.  It would be a bug if this failed on amd64.