/usr/lib/x86_64-linux-gnu/libdb_java.so is in libdb5.3-java-dev 5.3.28-9+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libdb_java-5.3.so
/usr/lib/x86_64-linux-gnu/libdb_java-5.3.so