Bug#1147930: Several java packages make autobuilder to hang

[Juan Manuel Méndez Rey]

Hi,

Reopening: milib still hangs with gradle 4.6-2 in a clean unstable chroot
today:

  java.lang.ClassCastException: class org.slf4j.helpers.NOPLoggerFactory cannot be cast to class org.gradle.internal.logging.slf4j.OutputEventListenerBackedLoggerContext

/usr/share/java now has both slf4j-api 1.7.36 and 2.0.19, because logback
pulls in libslf4j2-java. Gradle picks the test workers' slf4j jar as the
first match in an unsorted directory listing, so whether it hangs depends
on the filesystem. That is probably why your builds passed.

Fix: https://salsa.debian.org/java-team/gradle/-/merge_requests/14
It links the 1.x jars into /usr/share/gradle/lib, which is searched
first. milib and adql build with it.

Thanks,
Juan