how to get xpath from raw html code using java program?

i want to get the Xpaths of all the elements present on the web page using java program,so that i can create an Xpath repository to use in selenium testing?

i have tried it using Jsoup but not able to get it till now. what i have tried so far is,

    Document doc = Jsoup.connect("http://www.google.com").get();
    Elements elements = doc.body().select("*");
    and so on..

i do not wanted to do it manually using browser inspection or any extension.