Getting Final HTML with Javascript rendered Java as String

Use phantomjs: http://phantomjs.org

var page = require('webpage').create();
page.open("http://www.glamsham.com/movies/reviews/rowdy-rathore-movie-review-cheers-for-rowdy-akki-051207.asp")
setTimeout(function(){
    // Where you want to save it    
    page.render("screenshoot.png")  
    // You can access its content using jQuery
    var fbcomments = page.evaluate(function(){
        return $(".fb-comments iframe").contents().find(".postContainer") 
    }) 
},10000)

You have to use the option in phantom --web-security=no to allow cross-domain interaction (ie for facebook iframe)

To communicate with other applications from phantomjs you can use a web server or make a POST request: https://github.com/ariya/phantomjs/blob/master/examples/post.js

You can use HTML Unit, A java based "GUI LESS Browser". You can easily get the final rendered output of any page because this loads the page as a web browser do so and returns the final rendered output. You can disable this behaviour though.

UPDATE: You were asking for example? You don't have to do anything extra for doing that:

Example:

WebClient webClient = new WebClient();
HtmlPage myPage = ((HtmlPage) webClient.getPage(myUrl));

UPDATE 2: You can get iframe as follows:

HtmlPage myFrame = (HtmlPage) myPage.getFrameByName(myIframeName).getEnclosedPage();

Please read the documentation from above link. There is nothing you can't do about getting page content in HTMLUnit

The simple way to solve that problem. Hello, you can use HtmlUnit is java API, i think it can help you to access the executed js content, as a simple html.

WebClient webClient = new WebClient();
HtmlPage myPage = (HtmlPage) webClient.getPage(new URL("YourURL"));
System.out.println(myPage.getVisibleText());