/usr/share/maven-repo/org/apache/tomcat/tomcat-websocket/8.x/tomcat-websocket-8.x.jar is in libtomcat8-java 8.5.30-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/org/apache/tomcat/tomcat-websocket/8.x/../../../../../../java/tomcat8-websocket-8.5.30.jar