You can uninstall or removes an installed libstax2-api-java package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove libstax2-api-java
If you would like to remove libstax2-api-java and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libstax2-api-java
If you use with purge options to libstax2-api-java package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libstax2-api-java
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 libstax2-api-java