<plugins>

             <plugin>

                 <groupId>org.apache.maven.plugins</groupId>

                 <artifactId>maven-compiler-plugin</artifactId>

                 <version>3.0</version>

                 <configuration>

                     <source>1.7</source>

                     <target>1.7</target>

                 </configuration>

             </plugin>

         </plugins>

 <?xml version="1.0" encoding="UTF-8"?>

 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xmlns="http://java.sun.com/xml/ns/javaee"

     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

     id="WebApp_ID" version="3.0">

 <?xml version="1.0" encoding="UTF-8"?>

 <faceted-project>

   <fixed facet="wst.jsdt.web"/>

   <installed facet="wst.jsdt.web" version="1.0"/>

   <installed facet="java" version="1.7"/>

   <installed facet="jst.web" version="3.0"/>

 </faceted-project>