Bug#906340: bookkeeper: FTBFS in buster/sid (Could not resolve dependencies for project org.apache.bookkeeper:bookkeeper-server:jar:4.4.0)

[Emmanuel Bourg]

> [ERROR] Failed to execute goal on project bookkeeper-server: Could not resolve dependencies for project org.apache.bookkeeper:bookkeeper-server:jar:4.4.0: Cannot access central (https://repo.maven.apache.org/maven2) in offline mode and the artifact io.netty:netty:jar:debian has not been downloaded from it before. -> [Help 1]

It turns out bookkeeper still expects libnetty-3.9-java to be there
despite its dependency on libnetty-java. Since we plan to remove
libnetty-3.9-java the right way forward is to upgrade bookkeeper to the
version 4.7 which uses Netty 4.x (the versions 4.5 and 4.6 use a beta
version of zookeeper that isn't available yet, the version 4.7 reverted
to the stable version already in Debian). Unfortunately the version 4.7
currently fails to build due to the lombok incompatibility with Java 9+
(see #893312).

I uploaded bookkeeper because it was a dependency of hadoop, but it
isn't in Debian yet. So this issue can be ignored for now.