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Home/ Questions/Q 7951349
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Editorial Team
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Editorial Team
Asked: June 4, 20262026-06-04T02:32:02+00:00 2026-06-04T02:32:02+00:00

Sometimes after adding a library to an Eclipse Java project, Eclipse is still confused

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Sometimes after adding a library to an Eclipse Java project, Eclipse is still confused and showing errors (cannot resolve type, etc).

Eclipse seems to get tripped up like this quite a lot. F5/Refresh does not fix the problem.

I have been cutting and then pasting the “error” code which resolves the errors, but this solution is ugly, especially if there is a large project. Is there a better way to do this?

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  1. Editorial Team
    Editorial Team
    2026-06-04T02:32:03+00:00Added an answer on June 4, 2026 at 2:32 am

    I have run into this problem before. I would suggest these in order:

    • Delete the imports that were accidentally added. (This can be done by hovering over the wavy yellow line and context select => Organize Imports). Make sure to save the file. If that doesn’t fix…
    • From the main Eclipse menu, select Project -> Clean… and rebuild the affected file. If that doesn’t fix…
    • Project -> Clean… and clean all projects. If that doesn’t fix…
    • Restart Eclipse from the command line. See http://wiki.eclipse.org/FAQ_How_do_I_run_Eclipse%3F for restarting from the command line. I recommend using the -clean option, which you can read more about at http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.platform.doc.isv/reference/misc/runtime-options.html.
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