Why doesn‘t my java compiler level match my installed project facet?

Question

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."

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

GokcenG · Accepted Answer · 2014-02-19 12:00:38Z

up vote55down voteaccepted

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:

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.

edited Feb 19 at 12:00

answered Jul 8 ‘12 at 23:05

GokcenG
1,042723

Thank you, but I don‘t see Project Facets anywhere under Project Properties:i.imgur.com/9LqSf.png I am using Eclipse 3.7 on Mac Lion. Why might this be? – David Faux Jul 8 ‘12 at 23:09

I‘ve quickly looked for similar problems and I‘ve found some pages about it. You can check them:1, 2, 3 – GokcenG Jul 8 ‘12 at 23:15

8

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 8 ‘12 at 23:20

1

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 8 ‘12 at 23:29

3

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? – David Faux Jul 8 ‘12 at 23:31

Java compiler level does not match the version of the installed Java project facet.

Why doesn‘t my java compiler level match my installed project facet?

3 Answers