I have a sample hello-world maven project in github hello-world

Maven is a build tool used to compile, test and package the application developed using Java programming language.

Run the mvn clean package command to compile and package the java application.

The hello-world.war file will be created in targets folder


I have already created a file Dockerfile and kept in root folder

From tomcat:8-jre8

COPY ./target/hello-world.war /usr/local/tomcat/webapps

In the FROM command we are taking tomcat:8-jre8 as a base image.

On top of that we are copying the hello-world.war file from target folder and keeping it in /usr/local/tomcat/webapps inside a container.

we no need to explicity define the CMD here, because CMD is already written in base docker image tomcat:8-jre8 to start the tomcat webserver.