This post is about how to change version of project facet Dynamic Web Module to 3.0 or any other in Eclipse!
Open web.xml from project structure
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>Servlet 3.0 Web Application</display-name>
</web-app>
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
2. There is a .settings folder under your project directory
3. 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.
