CODEWITHSUNDEEP
eclipsemavenm2eclipse
user974802
user974802

Reputation: 3457

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

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).

Upvotes: 240

Views: 347348

Answers (12)

cmgharris
cmgharris

Reputation: 449

I found @bigleftie's comment above very helpful: "Four things must match

  1. Project->Java Build Path->Libraries->JRE version
  2. Project->Java Compiler-> Compiler Compliance Level
  3. Project->Project Facets->Java->Version
  4. (if using Maven) pom.xml - maven-compiler-plugin artefact source and target".

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.

Upvotes: 15

TK Gospodinov
TK Gospodinov

Reputation: 8452

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.

Project Factes - Java version

Upvotes: 462

Derrick
Derrick

Reputation: 4417

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 -

enter image description here

Upvotes: 8

Danilo Lira
Danilo Lira

Reputation: 21

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.

enter image description here

Upvotes: 2

ADL
ADL

Reputation: 2856

If using eclipse,

Under.settings click on org.eclipse.wst.common.project.facet.core.xml

<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
  <installed facet="java" version="1.7"/>
</faceted-project>

Change the version to the correct version.

Upvotes: 1

Anant Laxmikant Bobde
Anant Laxmikant Bobde

Reputation: 564

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

Upvotes: 4

RishiKesh Pathak
RishiKesh Pathak

Reputation: 2272

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)

Change the jdk to latest

Upvotes: 6

Dheeraj
Dheeraj

Reputation: 173

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.

Upvotes: 5

user3925215
user3925215

Reputation: 41

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

Upvotes: 4

Raphael
Raphael

Reputation: 1812

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

Upvotes: 3

Nestor Urquiza
Nestor Urquiza

Reputation: 3027

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.

Upvotes: 19

Vineet Reynolds
Vineet Reynolds

Reputation: 76709

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:

<build>
  <plugins>
    <plugin>
      <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.6</source>
          <target>1.6</target>
        </configuration>
    </plugin>
  </plugins>
</build>

Alternatively, you can specify the maven.compiler.source and maven.compiler.target properties with values of 1.6, that happen to be the equivalent:

<properties>
    <maven.compiler.target>1.6</maven.compiler.target>
    <maven.compiler.source>1.6</maven.compiler.source>
</properties>

Upvotes: 176

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