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

Question

I have created a New Dynamic Project under Eclipse Helios Version  where my JRE Version is set to 1 6  I have added Maven capabilities to the Web Application by clicking on Configure   Convert to Maven Project   After adding this  a build error appeared in the Eclipse Problems view   Java compiler level does not match the version of the installed Java project facet  Unknown Faceted Project Problem  Java Version Mismatch    Please tell me how to resolve this error  I want to have my JRE version as 1 6 only

User · Answer

I resolved it by Myproject--- java Resource---- libraries-- JRE System Libraries java-1 6  click on this go to its  property  select  Classpath Container  change the Execution Environment to java-1 8 jdk1 8 0-35   that is latest

User · Answer

Assuming that you are using the m2e plugin in Eclipse  you ll need to specify the source and target versions as 1 6 for maven-compiler-plugin  m2e uses these values to determine the project s Java compiler level  A snippet of the POM is shown below    lt build gt     lt plugins gt       lt plugin 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   lt  build gt    Alternatively  you can specify the maven compiler source and maven compiler target properties with values of 1 6  that happen to be the equivalent    lt properties gt       lt maven compiler target gt 1 6 lt  maven compiler target gt       lt maven compiler source gt 1 6 lt  maven compiler source gt   lt  properties gt

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You can change project facet from Project --  Properties --  Project Facet --  Java --   required JDK version

User · Answer

The Project Facet- Java should match whatever you have in the pom xml for the maven-compiler-plugin artifact source and target This is perfect But if you donot have it here then you can also fix it by matching Java compiler version in Porject-Facets from the setting  Eclispe- Preferences- Java- Compiler

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If your project is not a Maven project  right-click on your project and choose Properties to open the Project Properties dialog   There is a Project Facets item on the left  select it  look for the Java facet on the list  choose which version you want to use for the project and apply

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I found  bigleftie s comment above very helpful   quot Four things must match  Project- gt Java Build Path- gt Libraries- gt JRE version Project- gt Java Compiler- gt  Compiler Compliance Level Project- gt Project Facets- gt Java- gt Version  if using Maven  pom xml - maven-compiler-plugin artefact source and target quot    In my case  in the project properties  Java compiler  the JDK compliance was set to use the workspace settings  which were different from the java version for the project  I clicked on  Configure Workspace Settings   and changed the workspace Compiler compliance level to what I wanted  and the problem was resolved

User · Answer

I resolved this problem by setting the java version in Project Facet property of the project properties  Right click the project root folder -  Properties  search for Project Facets  and select compatible java version   For reference -

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I changed the configuration inside workspace project  setting org eclipse wst common project facet core to    installed facet  jst web  version  2 5  installed facet  jst java  version  1 7    Before changing config  remove project from IDE  This worked for me

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If using eclipse    Under settings click on org eclipse wst common project facet core xml   lt  xml version  1 0  encoding  UTF-8   gt   lt faceted-project gt     lt installed facet  java  version  1 7   gt   lt  faceted-project gt    Change the version to the correct version

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In Eclipse  right click on your project  go to Maven  Update projetc  Wait and the error will disappear  This is already configured correctly the version of Java for this project

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TK Gospodinov answer is correct even for maven projects  Beware  I do use Maven  The pom was correct and still got this issue  I went to  Project Facets  and actually removed the Java selection which was pointing to 1 6 but my project is using 1 7  On the right in the  Runtimes  tab I had to check the jdk1 7 option  Nothing appeared on the left even after I hit  Apply   The issue went away though which is why I still think this answer is important of the specific  Project Facets  related issue  After you hit OK if you come back to  Project Facets  you will notice Java shows up as version 1 7 so you can now select it to make sure the project is  marked  as a Java project  I also needed to right click on the project and select Maven Update Project

User · Answer

Right click the project and select properties  Click the java compiler from the left and change to your required version Hope this helps

[eclipse] Java compiler level does not match the version of the installed Java project facet

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