Cannot change version of project facet Dynamic Web Module to 3.0

INTRODUCTION

We may get this error on any of the below cases.

1. Creating a new Dynamic Web Project
2. New Maven Maven Project
3. Importing existing maven project.

Following are the different solution for this issue.

SOLUTION - 1

1. Select your project
2. Right click and go to Properties->Project Facets->Change the version 3.0 for Dynamic Web Module & also select Java version higher than JDK 6.
3. Apply & OK

SOLUTION - 2

If it is a maven project, just add the below to your pom.xml

<build>  <plugins>      <plugin>     <artifactId>maven-compiler-plugin</artifactId>     <configuration> <source>1.8</source> <target>1.8</target>     </configuration>   </plugin>  </plugins> </build>

SOLUTION - 3

1. Go to project root folder in your local disk
2. Go to .settings folder
3. Open org.eclipse.wst.common.project.facet.core.xml file and change the below

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

4. Restart the Eclipse and Update your Maven Project.

SOLUTION - 4

1. Go to web.xml and update the <web-app> below.

<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">

2. Clean the Project & Update your Maven Project.

Hope any of the above solutions will resolve this issue.

Happy Knowledge Sharing!!!