/usr/share/maven-repo/org/eclipse/jdt/core/compiler/ecj/3.11.1/ecj-3.11.1.jar is in libecj-java 3.11.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/org/eclipse/jdt/core/compiler/ecj/3.11.1/../../../../../../../../java/eclipse-ecj-3.11.1.jar