/usr/lib/eclipse/plugins/com.ibm.icu_49.1.0.jar is in eclipse-rcp 3.8.1-10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/eclipse/plugins/../../../share/java/icu4j-49.1.jar
/usr/lib/eclipse/plugins/../../../share/java/icu4j-49.1.jar