/usr/share/java/jboss-serialization.jar is in libjboss-serialization-java 1.0.3.GA+dak1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/jboss-serialization-1.0.3.GA+dak1.jar
/usr/share/java/jboss-serialization-1.0.3.GA+dak1.jar