idea中的web.xml配置文件报错 Filter should have a mapping或者Server should have a mapping

idea中的web.xml配置文件报错 Filter should have a mapping或者Server should have a mapping #今天做项目的时候烤了一个web.xml配置文件放到了另一个子工程中,结果就出现了如图所示的报错,Filter should have a mapping(而我已经在下面配置了filter-mapping),到网上找了一下,才发现是工程的we
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