RequestBuilder will return you the text of the response body. If, as you say, A.jsp generates it's content via GWT, then you'll not find the elements of interest. GWT is a client side JS technology. The content for A.jsp will not be rendered, you'll only be getting the raw HTML created by A.jsp.--
Why don't you use an XHR request to fetch the needed data from an endpoint instead? Further, it's best to no depend on fetching elements from a different page as this goes against most browser security policies.
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