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:
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Cannot change version of project facet Dynamic Web Module to 3.0
One or more constraints have not been satisfied
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In order to fix this first thing I did is to change Project Facets settings.
Right click on Project in EclipsePropertiesProject Facets Tab3.1 to 3.0 for Dynamic Web Module as mentioned in below image.
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.
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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>
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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.
Just replace <build> block with this one.
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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>
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or
How to fix Cannot change version of project facet Dynamic Web Module to 3.0 Error in Eclipse---转载
原文：http://www.cnblogs.com/asingna/p/5616989.html