/usr/share/maven-repo/org/codehaus/plexus/plexus-compiler-j2objc/2.x/plexus-compiler-j2objc-2.x.jar is in libplexus-compiler-java 2.8.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/org/codehaus/plexus/plexus-compiler-j2objc/2.x/../../../../../../java/plexus-compiler-j2objc-2.x.jar