1. Java 17
2. Maven
3. Apache Tomcat v10

You can build the webapp with the command

mvn clean package

You can set the CATALINA_HOME environment variable to the location of Tomcat.

The contents of $CATALINA_HOME should look like this:

% ls $CATALINA_HOME
BUILDING.txt	CONTRIBUTING.md	bin		conf		lib		logs		temp		webapps		work

Navigate to the root directory of HelloTomcat, where pom.xml is located. Now run the command:

cp target/HelloTomcat.war $CATALINA_HOME/webapps

You can start Tomcat by navigating to the location of Tomcat, $CATALINA_HOME, and running the command:

bin/startup.sh

This should expand the HelloTomcat.war file which is saved in the webapps folder.

You can stop Tomcat by navigating to $CATALINA_HOME and running the command:

bin/shutdown.sh

After starting Tomcat, point your browser to http://localhost:8080/HelloTomcat and you'll see the index page.

You can also point your browser to http://localhost:8080/HelloTomcat/hello and see the response by the servlet.

Tomcat requires zero configuration. You just run bin/startup.sh and drop your war file in the webapps folder.

You can get more functionality from Tomcat by creating an admin or manager user.

At the end of the file $CATALINA_HOME/conf/tomcat-users.xml, you can add the line

<user username="tomcat" password="yourpassword" roles="manager-gui,admin-gui"/>

With Tomcat started, point your browser to http://localhost/manager. You can log in with the username "tomcat" and the password of your choice.

In the manager GUI, you should be able to see and manage all of your webapps, including HelloTomcat.