When The Catcher in the Rye was first released, numerous offers were made to adapt it for the screen (with Sam Goldwyn, the producer of My Foolish Heart, among them.) In a letter written in the early fifties, Salinger spoke of mounting a play in which he would play the role of Holden Caulfield opposite Margaret O'Brien, and, if he couldn’t play the part himself, to “forget about it." Almost fifty years later, the writer Joyce Maynard definitively concluded, "The only person who might ever have played Holden Caulfield would have been J. D. Salinger." Despite this, Salinger told Maynard in the seventies, "Jerry Lewis tried for years to get his hands on the part of Holden," and luminaries ranging from Jack Nicholson to Tobey Maguire and Leonardo DiCaprio have since made efforts to make a film of Catcher.
Source: Wikipedia (I think)