How to fix Cannot change version of project facet Dynamic Web Module to 3.0 Error in Eclipse---轉載

How to fix Cannot change version of project facet Dynamic Web Module to 3.0 Error in Eclipse

原文：http://crunchify.com/how-to-fix-cannot-change-version-of-project-facet-dynamic-web-module-to-3-0-error-in-eclipse/

Today while converting Dynamic Web Project to Maven project I got below Error:

 

 

1 2	Cannot change version of project facet Dynamic Web Module to 3.0  One or more constraints have not been satisfied

 

What steps I’ve performed to fix this?

In order to fix this first thing I did is to change Project Facets settings.

1. Right click on Project in Eclipse
2. Click on Properties
3. Click on Project Facets Tab
4. Change value from 3.1 to 3.0 for Dynamic Web Module as mentioned in below image.

Did it work? Nope.

But unfortunately I was not able to apply setting as Apply and OK button was grayed out with error msg:Cannot change version of project facet Dynamic Web Module to 3.0.

I was literally stuck at this point.

Then I’ve looked at my pom.xml file. I’ve converted Dynamic Web Project to Maven Project by following steps in article.

pom.xml Build Block

 

 

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<build>     <sourceDirectory>src</sourceDirectory>     <plugins>       <plugin>         <artifactId>maven-compiler-plugin</artifactId>         <version>3.1</version>         <configuration>           <source>1.8</source>           <target>1.8</target>         </configuration>       </plugin>       <plugin>         <artifactId>maven-war-plugin</artifactId>         <version>2.4</version>         <configuration>           <warSourceDirectory>WebContent</warSourceDirectory>           <failOnMissingWebXml>false</failOnMissingWebXml>         </configuration>       </plugin>     </plugins>   </build>

By default Eclipse adds above <build> block to pom.xml file and that is THE problem for this error: Cannot change version of project facet Dynamic Web Module to 3.0.

How to fix?

Step-1

Just replace <build> block with this one.

pom.xml build block

 

 

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<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.7</source> <target>1.7</target> </configuration> </plugin> </plugins> </build>

 

Step-2

• Right Click on Project
• Click Maven
• Click Update Project

or

• use Quick Fix from error console

Have a suggestion or anything to add to this article? Chime in and share as a comment.