/usr/share/maven-repo/org/eclipse/jetty/websocket/javax-websocket-server-impl/ is in libjetty9-extra-java 9.2.14-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/maven-repo/org/eclipse/jetty/websocket/javax-websocket-server-impl/9.2.14.v20151106/
/usr/share/maven-repo/org/eclipse/jetty/websocket/javax-websocket-server-impl/9.2.14.v20151106/javax-websocket-server-impl-9.2.14.v20151106.jar
/usr/share/maven-repo/org/eclipse/jetty/websocket/javax-websocket-server-impl/9.2.14.v20151106/javax-websocket-server-impl-9.2.14.v20151106.pom
/usr/share/maven-repo/org/eclipse/jetty/websocket/javax-websocket-server-impl/debian/
/usr/share/maven-repo/org/eclipse/jetty/websocket/javax-websocket-server-impl/debian/javax-websocket-server-impl-debian.jar
/usr/share/maven-repo/org/eclipse/jetty/websocket/javax-websocket-server-impl/debian/javax-websocket-server-impl-debian.pom