Feign PathVariable annotation was empty on param 0.

使用Feign的时候,如果参数中带有

@PathVariable形式的参数,则要用value=""标明对应的参数,否则会抛出IllegalStateException异常

如 @PutMapping("/disuseable/{sn}") ApiResponse disUseAble(@PathVariable String sn); // wrong

--> @PutMapping("/disuseable/{sn}") ApiResponse disUseAble(@PathVariable(value="sn") String sn); // right

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