Resolve MAVEN Project cannot change version of Project facet Dynamic Web module to 3.0/3.1

1. Open the. Settings folder in the directory where the project is located

Open Org.eclipse.wst.common.project.facet.core.xml

Change <installed facet= "java" version= "1.5"/> to <installed facet= "java" version= "1.8"/> <installed facet= "Jst.web" version= "2.3"/> Changed to <installed facet= "Jst.web" version= "3.0"/>

<?xml version= "1.0" encoding= "UTF-8"?><faceted-project>  <fixed facet= "Wst.jsdt.web"/>  <installed facet= "java" version= "1.8"/>  <installed facet= "Jst.web" version= "3.0"/>  < Installed facet= "Wst.jsdt.web" version= "1.0"/></faceted-project>

　　

2. Increase in Pom.xml

<!--define the project compile level--           <plugin>            <groupid>org.apache.maven.plugins</ groupid>            <artifactId>maven-compiler-plugin</artifactId>                      <configuration>                < source>1.8</source>                <target>1.8</target>            </configuration>        

　　

Resolve MAVEN Project cannot change version of Project facet Dynamic Web module to 3.0/3.1