Eclipse警告解决：Implementation of project facet maven could not be found. Functionality will be limited

类似的警告有：
  Implementation of project facet maven could not be found. Functionality will be limited.
  Implementation of project facet me.spring could not be found. Functionality will be limited.
  解决的方法是直接修改项目的配置文件，如下图所示：
Eclipse警告解决：Implementation of project facet maven could not be found. Functionality will be limited

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