这个错误是因为java获取页面数据的时候，id值可能为空，而int的默认值为0，若想能够接受NULL的值，将int换成integer即可解决。
遇到这个错误就是把参数int 改成Integer
大家以后在springmvc接受参数的时候，尽量不要使用基本数据类型，当然你一定要使用的话，可以把defaultValue加上，这样就不会报这个错误了。
注意：就算你加上required=false, 一样也是不行的。
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