You can uninstall or removes an installed libcommons-jxpath-java-doc package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove libcommons-jxpath-java-doc
If you would like to remove libcommons-jxpath-java-doc and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libcommons-jxpath-java-doc
If you use with purge options to libcommons-jxpath-java-doc package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libcommons-jxpath-java-doc
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove libcommons-jxpath-java-doc