Open web.xml from project structure http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> Servlet 3.0 Web Application
and update web.xml file for example change version = "2.5"
Also change the org.eclipse.wst.common.project.facet.core.xml file from your project .settings file Follow the steps
1. Window > Show View > Other > General > Navigator
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There is a .settings folder under your project directory
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Change the dynamic web module version in this line to 2.5 4.Change the Java version in this line to 1.5 or higher
Now refresh your project and get set to run on your server.
Do follow the blog for the solution http://scrapillars.blogspot.in/2014/02/how-to-change-project-facet-in-eclipse.html
The solution is produced with image illustrations