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@RequestMapping(value = "/{name}/update", method = RequestMethod.POST)
public String update(@PathVariable String name, @Validated Book book, BindingResult br) {
if (br.hasErrors()) {
System.out.println("error");
return "update";
}
books.put(name, book);
System.out.println("update " + book);
return "redirect:/book/list.html";
}