Demo Java Web Application

Simple java project demo that builds a war file and builds a deployable Docker image using .gitlab-ci.yaml file.

Build

The build script uses mvn package to produce a demo.war file and then bundles it with a Docker image that runs Tomcat.

Test

The Test script uses mvn test to test the applcation .war file before it bundles with a Docker image that runs Tomcat.

Docker Build

• mvn package was ran and the target/demo.war was moved into pkg/demo.war
• a docker image was built which copied the pkg/demo.war to /usr/local/tomcat/webapps/demo.war. Check out the Dockerfile for details.

Here's an example of some things to check after running the build script:

$ ls pkg/demo.war
pkg/demo.war
$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
demo-java           latest              88092dfb7325        6 minutes ago       591MB
tomcat              8.5                 a92c139758db        2 weeks ago         558MB
$

Docker Run in local machine

Here are the summarized commands to run and test that Tomcat is serving the war file:

docker run --rm -p 8080:8080 -d demo-java
docker exec -ti $(docker ps -ql) bash
curl localhost:8080/demo/Hello
curl localhost:8080/demo/index.jsp
exit
docker stop $(docker ps -ql)