HowToDoInJava

Home / Maven / Solved: Java compiler level does not match the version of the installed Java project facet

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

by

I have been facing this issue from quite long time as I didn’t took care of it. Everytime I faced this issue, I just went and changed the project compiler level for projects facets menu in eclipse. Today, I decided to end this for all.

This error looks like in eclipse is as follow:

Maven compiler level mismatch error
Maven compiler level mismatch error

Reason:

This error is because of maven compiler plugin defaults. Which is currently 1.5. So if you are using java 1.6 for building your project, you are going to face this issue every time you run this command:

mvn eclipse:eclipse -Dwtpversion=2.0

According to maven documentation : “at present the default source setting is 1.5 and the default target setting is 1.5, independently of the JDK you run Maven with. If you want to change these defaults, you should set source and target as described in Setting the -source and -target of the Java Compiler.”

My case was worse because at that time default was java 1.4. :-(

Solution:

To solve this issue, you need to make one time update in your pom.xml file. This update is for overriding the default compiler level in maven compiler plugin.

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

Update above compiler properties with your desired java version. And place this configuration inside “build” node in pom.xml file like this:

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

Above change will correct the error.

Happy Learning !!

Reference: http://maven.apache.org/plugins/maven-compiler-plugin/

Stay Updated with Awesome Weekly Newsletter

Feedback, Discussion and Comments

  1. MY project is non maven . and my project faced is locked . kindly any solution.

    Reply

  2. This solved my problem:
    go to window -> preferrences->java>compiler (set to 1.6 already) again apply changes and –> OK

    Reply

  3. Well, even after doing this if you still get problem then just go to your workspace folder and delete .settings folder of your project and refresh your project in eclipse. Cheers.

    Reply

    • Thanks for adding value to this post.

      Reply

  4. Still having the issue here. Using STS

    Reply

  5. This solved my maven building issues, thanks very much

    Reply

  6. Thanks much for sharing your solution …

    Reply

  7. Great! Thanks for your article.
    BTW,when I input my e-mail, It automatically filled the name && website, how to achieve it?

    Reply

Ask Questions & Share Feedback

Your email address will not be published. Required fields are marked *

*Want to Post Code Snippets or XML content? Please use [java] ... [/java] tags otherwise code may not appear partially or even fully. e.g.
[java] 
public static void main (String[] args) {
...
} 
[/java]

Help me fight spammers. Solve this simple math. *