Meu arquivo XML
arquivo pom
4.0.0
<groupId>br.com.alura.maven</groupId>
<artifactId>lojaweb</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>lojaweb Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.alura.com.br</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>lojaweb</finalName>
<plugins>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.3.7.v20160115</version>
</plugin>
</plugins>
</build>Estou usando a versão java 1.8
ERRos Logs
Description Resource Path Location Type Cannot change version of project facet Dynamic Web Module to 3.1. lojaweb line 1 Maven Java EE Configuration Problem
E
Description Resource Path Location Type One or more constraints have not been satisfied. lojaweb line 1 Maven Java EE Configuration Problem
