Gradle 3.4.1 broken on Java8!

[Andreas Schildbach]

The latest sync to the experimental Debian version 3.4.1 of Gradle is
broken on Java8. See
https://bugs.launchpad.net/ubuntu/+source/gradle/+bug/1760359

I'd rather return to 3.2.1 than living with a broken Gradle for another
2 years cycle (3.2.1 was broken on the last 3 releases too and just
fixed recently so we have a working version in the LTS).

Why was a broken version synched? Is software in Debian experimental
even ready for sync?