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I don't know dom4j, but that line 49 looks fishy to me. You already got nodes which matched /rss/channel/item/description, so once you have them you shouldn't have to provide any XPath expression to get them. Or whatever you meant that to be.
My guess is that the //user//description string is being used as an XPath expression. So it returns all of the nodes which you already got earlier in the code, and then the valueOf() method necessarily selects just the first of them.
But I'm just guessing. I would say you don't need that line of code.