/usr/share/java/tomcat8-el-api.jar is in libtomcat8-java 8.0.32-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/tomcat8-el-api-8.0.32.jar
/usr/share/java/tomcat8-el-api-8.0.32.jar