Example of ServletContextListener Implementation

According to Oracle official documenentation, the ServletContextListener Interface is responsible for receiving notifications about the ServletContext lifecycle changes, more specifically its initialization and destruction. This can be really helpful for developers in some specific situations, like for example when we need to execute a block of code right before the application starts or shut down.

In this short tutorial I’m going give a really simple example of a ServletContextListener Implementation.

With our Java Web project created let’s create a Java class that implements the ServletContextListener interface, it should look like this:

package tech.fourDev.servletContextListenerSample;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class ServletContextListenerSample implements ServletContextListener{
    public void contextInitialized(ServletContextEvent sce) {
    public void contextDestroyed(ServletContextEvent sce) {

This is our listener, you can see that I’ve already implemented the contextInitialized and contextDestroyed methods, as the name suggests the first one will be called when the ServletContext starts and the other one when it gets destroyed.

There is just one more thing to be done before you can run your application, you need to register this listener in your web.xml:


Perfect! Now if you run your application you’ll see the word “INITIALIZED” printed when you deploy your project and the word “DESTROYED” when you undeploy or redeploy it.

Recommended for you

Improve Performance by Increasing Glassfish Memory When a Glassfish domain is created it already comes with a default set of JVM options (including memory related options), as you keep working on your project your application will increasingly grow and consume more memory, until it reaches the point where the default Glassfish memory configuration i...
Tutorial: Custom ListView with ImageViews and TextViews There is no doubt that the ListView is one of the most used Android UI components, in most cases developers find themselves in a situation where they need to customize this component, instead of just showing a list of Strings on the screen they also need to show more information, an ImageView, or ev...
Automatically Mapping JPA Entities with Netbeans Creating the JPA entities manually can be really time consuming, specially if you're working with a huge database with hundreds of tables. Luckily, Netbeans IDE can automatically create the entities for us, if you want to see how just follow the instructions bellow: 1 - Right click on your packag...
React.js Tutorial: Consuming JavaEE RESTful Web Services In this post I'm going to show how to consume Web Services with React.js, more specificalyJavaEE RESTful Web Services. I've already written a post showing how to create these web services with EJB 3, if you haven't seen it yet just click on this link for more details, but if you're already familiar ...

Leave a Reply

Your email address will not be published. Required fields are marked *

Obs: Use the tag <pre lang="LANGUAGE"> to include code blocks to your comment.
Example: <pre lang="javascript"> console.log('Test'); </pre>