Eclipse's "problems" tab is displaying this error:
Description: Java compiler level does not match the version of the installed Java project facet.
Resource: groupping
Path: [blank]
Location: Unknown
Type: Faceted Project Problem (Java Version Mismatch)
My pom.xml has this setting:
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
Where else could the settings be mismatched?
You have two options to fix the issue:
1- Manually make sure the two versions match.
2- Use the IDE's help as follows:
- Right mouse click on the error in the 'Problems' view
- Select the 'Quick Fix' menu item from the pop-up menu
- Select the right compiler level in the provided dialog and click 'Finish'.
Taken from Eclipse: Java compiler level and project facet mismatch
Also gives location of where you can access the Java compiler and facet version.
In Spring STS, Right click the project & select "Open Project", This provision do the necessary action on the background & bring the project back to work space.
Thanks & Regards Vengat Maran
I encountered this issue while running an app on Java 1.6 while I have all three versions of Java 6,7,8 for different apps.I accessed the Navigator View and manually removed the unwanted facet from the facet.core.xml .Clean build and wallah!
<?xml version="1.0" encoding="UTF-8"?>
<fixed facet="jst.java"/>
<fixed facet="jst.web"/>
<installed facet="jst.web" version="2.4"/>
<installed facet="jst.java" version="6.0"/>
<installed facet="jst.utility" version="1.0"/>
The project facets should be derived automagically by the M2Eclipse plugin from the POM configuration. If you make some changes to the POM and need Eclipse to take them into account, right-click on your project, then go to Maven > Update Project Configuration. You should not set project facets manually.
Source: Stackoverflow.com