references non-existing project XXX, launch configuration问题的解决办法

  1. Go to Project->properties
  2. In properties window's left pane select "Run/Debug Settings".
  3. Select "Configure" and click "edit"
  4. In tab "Main" replace Project to your current project.
  5. Select "Main class" by clicking on search button(it will be your class name).
  6. Now hit OK
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原文地址：https://www.cnblogs.com/borter/p/9450970.html