/usr/share/netbeans/java5/modules/ext/cglib-2.2.jar is in libnb-java5-java 8.1+dfsg3-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/netbeans/java5/modules/ext/../../../../java/cglib.jar
/usr/share/netbeans/java5/modules/ext/../../../../java/cglib.jar