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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?

dangerChihuahua007
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  • Possible duplicate of ["Faceted Project Problem (Java Version Mismatch)" error message](https://stackoverflow.com/questions/2239959/faceted-project-problem-java-version-mismatch-error-message) – BuZZ-dEE Jul 01 '19 at 15:56

4 Answers4

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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.

GokcenG
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  • Thank you, but I don't see Project Facets anywhere under Project Properties: http://i.imgur.com/9LqSf.png I am using Eclipse 3.7 on Mac Lion. Why might this be? – dangerChihuahua007 Jul 08 '12 at 23:09
  • I've quickly looked for similar problems and I've found some pages about it. You can check them:[1](http://stackoverflow.com/questions/11130320/how-do-i-change-the-java-version-of-my-installed-project-facet-in-eclipse), [2](http://stackoverflow.com/questions/10694648/gae-getting-started-in-java-eclipse-indigo-cant-compile-as-1-6), [3](https://groups.google.com/forum/?fromgroups#!topic/google-appengine/d04RY2fH7j0) – GokcenG Jul 08 '12 at 23:15
  • Thanks, I Googled around too, but all the solutions I've read hint at examining Project Properties | Facets, but I don't even have the Facets tab in the first place. – dangerChihuahua007 Jul 08 '12 at 23:17
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    Did you read the 3rd one? _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._ – GokcenG Jul 08 '12 at 23:20
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    There have been a couple reports of this problem from people using Google App Engine tooling. It appears that they are installing Faceted Project Framework without its corresponding UI, leaving users in the bind. Please report this issue to Google. In the meantime, GokcenG's advice of editing the specified configuration manually should unblock you. – Konstantin Komissarchik Jul 08 '12 at 23:29
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    Thank you! Solution number 3 did it. So, here's the fix I did again. 1) Switch to the Navigator Perspective (Window > Show Perspective > Navigator). 2) Open "org.eclipse.wst.common.project.facet.core.xml" under ".settings". 3) Changed my project facet from 1.4 to 1.6. This problem occupied me for the past 2 hours. Thanks a lot! I hope this thread helps others who encounter the same error. How does one report issues to Google by the way? – dangerChihuahua007 Jul 08 '12 at 23:31
  • Not sure. I'd start poking around wherever you downloaded the plugin from. See if there is a support link or something. – Konstantin Komissarchik Jul 08 '12 at 23:34
  • I'm glad to hear that you solved it. At that [site](https://developers.google.com/eclipse/community) there are 3 bug tracking links but I'm not sure which one to report that problem. – GokcenG Jul 08 '12 at 23:41
  • works like a charm on Eclipse Oxygen 4.7.0 + openJDK1.8 on CentOS 6.10 32bit platform. thanks! – alphaGeek Sep 09 '20 at 12:12
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Right click on your project->properties->Project Facets,

This will show your current version of java for your project facet.

In my case I had the correct version for my facet but not my compiler, So had to right click on project->properties->Java Compiler

Then under Compiler compliance level drop list and change to version of project facet.

java traniee
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its simple.. in Problems infotab, rightclick on error desc and select quickfix... choose facet version upgrade..

kumar ravi
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0

I got this issue in IBM RAD tool eclipse It got resolved following below.

  • Right click on project
  • Properties
  • Project facets
  • Configuration (select Default configuration for WebSphere application server v7.0 )
  • Apply
Michael Dodd
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Arjun Kushwah
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