[java] This compilation unit is not on the build path of a Java project

Another alternative to Loganathan Mohanraj's solution (which effectively does the same, but from the GUI):

  1. Right-Click on your project
  2. Go to "Properties"
  3. Choose "Project Natures"
  4. Click on "Add"
  5. Choose "Java"
  6. Click "Apply and Close"

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