For the past couple of years, I've regularly had issues where Eclipse reports unresolved references for projects that were fine when I closed down the night before; sometimes they'll show up right after I do an update from SVN making me wonder if I had a bad update or someone committed bad code.
Through some trial and error, I've found a sequence of steps that I follow that invariably solves the problem.
- Turn off Project Build Automatically
- Choose Project Clean and make sure that the “start build immediately” check box is unselected
- Clean the project(s) affected
- Close the projects in the IDE
- Shut down Eclipse
- Re-start Eclipse
- Re-open the projects
- Turn on Project Build Automatically
That should do it.
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