Faceted Project Problem Java Version Mismatch error message

Question

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    lt plugins gt       lt plugin gt           lt groupId gt org apache maven plugins lt  groupId gt           lt artifactId gt maven-compiler-plugin lt  artifactId gt           lt configuration gt               lt source gt 1 6 lt  source gt               lt target gt 1 6 lt  target gt           lt  configuration gt       lt  plugin gt   lt  plugins gt    Where else could the settings be mismatched

User · Answer

In Spring STS  Right click the project  amp  select  Open Project   This provision do the necessary action on the background  amp  bring the project back to work space   Thanks  amp  Regards Vengat Maran

User · Answer

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    lt  xml version  1 0  encoding  UTF-8   gt       lt fixed facet  jst java   gt    lt fixed facet  jst web   gt    lt installed facet  jst web  version  2 4   gt    lt installed facet  jst java  version  6 0   gt    lt installed facet  jst utility  version  1 0   gt

User · Answer

Did you check your Project Properties - gt  Project Facets panel   From that post      A WTP project is composed of multiple units of functionality  known as    facets          The Java facet version needs to always match the java compiler compliance    level    The best way to change java level is to use the Project Facets    properties panel as that will update both places at the same time          The  Project- gt Preferences- gt Project Facets  stores its configuration in this file   org eclipse wst common project facet core xml   under the   settings  directory         The content might look like this    lt  xml version  1 0  encoding  UTF-8   gt   lt faceted-project gt     lt runtime name  WebSphere Application Server v6 1   gt     lt fixed facet  jst java   gt     lt fixed facet  jst web   gt     lt installed facet  jst java  version  5 0   gt     lt installed facet  jst web  version  2 4   gt     lt installed facet  jsf ibm  version  7 0   gt     lt installed facet  jsf base  version  7 0   gt     lt installed facet  web jstl  version  1 1   gt   lt  faceted-project gt    Check also your Java compliance level

User · Answer

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

User · Answer

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

[java] "Faceted Project Problem (Java Version Mismatch)" error message

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