/usr/share/java/zookeeper-bookkeeper.jar is in libzookeeper-java 3.3.5+dfsg1-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/zookeeper-bookkeeper-3.3.5.jar
/usr/share/java/zookeeper-bookkeeper-3.3.5.jar