Failed to convert from type [java.lang.String] to type [java.lang.Long]

2018-10-29 13:35:33.639 WARN 2212 — [nio-8080-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved exception caused by handler execution: org.springframework.beans.TypeMismatchException: Failed to convert value of type ‘java.lang.String’ to required type ‘com.elemeHelper.entity.Cookie’; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.lang.Long] for value ‘fw’; nested exception is java.lang.NumberFormatException: For input string: “fw”

1.遇到一个这样的问题：
往后台传一个字符串的值，到后台接收参数时报错
Failed to convert from type [java.lang.String] to type [java.lang.Long]；
大概代码如下

原因(猜测)：
传递的是cookie，且接收的是cookie类里面的字段cookie，所以接收时分辨不出来？

解决：
把cookie类的字段cookie改成其它(value)，前台也传value:xxx ,就可以…