新的解决方法Optional int parameter ‘xxx_id‘ is present but cannot be translated int

这个解决方法之所以新，在于情况比较特殊

我是用ssm框架，关于这个问题，我报错的原因不在于前端传到后端的值是null的情况，而是在控制器方法之间跳转时没有传参导致的，就是我写了redirect:"到另一个方法的RequestMapping";，但没注意要跳转到的方法里需要传int型参数。

而最为致命的是，运行出现错误的当前控制器的方法里也有一个同名的int参数，导致报错时，我一直以为是前端传到后端这个过程报错，却没考虑后端之间跳转出现错误。

如上图所示，下面这个方法运行完以后直接重定向到上面那个方法，而我一直在下面这个方法的参数列表里寻找原因，所以一直找不到原因。

希望该问题有参考意义，节省大家的时间。

解决该问题以后，

因为我之前写重定向就是为了不用再查一次，直接用已有的实现查询功能的方法，修正这个问题就老老实实再查一次就完了。

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新的解决方法Optional int parameter ‘xxx_id‘ is present but cannot be translated int

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