{"code":400,"message":"Failed to convert value of type java.lang.String to required type java.util.Optional; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@org.springframework.web.bind.annotation.PathVariable java.lang.Long] for value book; nested exception is java.lang.NumberFormatException: For input string: "book"","data":null}
