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Editorial Team
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Asked: 2026-06-07T07:01:53+00:00

I made a simple Java Google AppEngine application called Guestbook in Eclipse 3.7 and

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I made a simple Java Google AppEngine application called Guestbook in Eclipse 3.7 and am trying to run it. However, I am encountering an error that lacks a quick fix:

Description Resource    Path    Location    Type
Java compiler level does not match the version of the installed Java project facet.
Guestbook       Unknown Faceted Project Problem (Java Version Mismatch)

I tried navigating to Project | Properties to change my project facet. However, I could not find a setting that dealt with “facet.”

enter image description here

What does “installed Java project facet” mean, and how do I fix this?

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1 Answer

  1. Editorial Team

    You can see your facets via Right click on your project->properties->Project Facets,

    Here you can see my facets for an example web application:
    here

    I think your Java facet does not match with the installed one. I’m suspicious that facet is at version 1.5. Please check it.

    Add-on:Open the Navigator view, expand the .settings folder, open the file org.eclipse.wst.common.project.facet.core.xml and manually set the Java version to 1.6.

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