This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Well, that looks perfectly fine to me the way you posted it.
But perhaps you were trying to say that you used the HTML named entity ™? (If you're going to post HTML entities, you have to escape them properly.)
In any case, your document is encoded in UTF-8. So either put the character itself into the document, encoded in UTF-8, or use a character entity like ™. And by the way it doesn't make any difference that it's inside a CDATA section, the same character rules apply there as for everywhere else in the document.