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One of the beauty of Java is that when the Java VM does not let you do something (here: accessing a Smart Card), there is no way that a purely Java solution will add this functionality.
Hence, what you ask simply can not be done in pure Java (1.)5. Some machine-specific non-java code is required. And you did not specify your target.
Unless a jar file could contain machine-specific code (I don't know if this is the case, and I never made one such jar file), there seems to be no way a jar file could help.
The JPCSC project (a part of Muscle Card) and Open Card Framework will allow you to communicate with a smartcard in Java 5. You will need to search the internet (or old posts on this forum) to find the files and examples as I do not have either right now. I know there have been posts about OCF on the forum.