“Coming Through the Rye,” set in the year 1969, is a heartfelt tale about the journey to adulthood of Jamie Schwartz, a sensitive 16-year-old who struggles with popularity at his all-boys boarding school. Feeling isolated from both his peers and teachers, Jamie is convinced that he is meant to portray Holden Caulfield, the protagonist of “The Catcher in the Rye,” and has transformed the novel into a theatrical production.