This project uses Docker so you can update the version of Tomcat from 9 to 10 in your Dockerfile:

FROM tomcat:9-jdk17
ADD target/MyWebApp.war /usr/local/tomcat/webapps/MyWebApp.war
EXPOSE 8080
CMD ["catalina.sh", "run"]

Now your Dockerfile will look like this:

FROM tomcat:10-jdk17
ADD target/MyWebApp.war /usr/local/tomcat/webapps/MyWebApp.war
EXPOSE 8080
CMD ["catalina.sh", "run"]

Before we start the migration from javax to jakarta let's run our project to see the error we need to fix. You can run your project with ⌃R (macOS) / Shift+F10 (Windows/Linux). Alternatively you can use the run icon in the gutter of thedocker-compose.yml file adjacent to services because we want the image to be rebuilt.

You can check the logs for your container to ensure you're running Tomcat 10.0 in the Services window with ⌘8 (macOS) / Alt+8 (Windows/Linux).

2024-11-12T10:59:13.575819010Z 12-Nov-2024 10:59:13.575 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet engine: [Apache Tomcat/10.1.33]

Now we're confident that we're using Tomcat 10.0, let's go to the webserver front end and see what happens. In your browser go to localhost:8080/MyWebApp and try to enter a name and fruit - you will get a 404 error. We're getting this error because Tomcat 9 used Java Servlet 4.0 which uses javax.* and Tomcat 10 uses Jakarta Servlet 5.0 which uses jakarta.*. Let's fix the problem now!