How to get FacebookSocialNetworkingServiceCallback to output a JSP

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This is the next chapter in the ongoing tale of customizing the Callback servlet

FacebookSocialNetworkingServiceCallback is executed after Facebook authentication completes, so to get a given page of HTML to be displayed, I replace the HTML contained in the out.println() statements with my own (actually, I replace the several println()s with a single one and concatenate all the lines in my HTML). So far, so good: with ordinary HTML, my page displays. But if I try to output a JSP, all that gets displayed is the text of the page:

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I should mention that the JSP in question consists entirely of scriptlets, if that makes a difference.

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Problem solved. All I needed to do was to copy the scriptlets into the servlet and voila! everything worked. Kind of obvious, in retrospect (both are just Java code).