This directory contains an out-of-the-box Spring Boot app from Spring
Initializr, and a fully fleshed Dockerfile which
builds an Nginx image containing running the app.
If you compare this with the example Node app, we don't do a separate step where
we download dependencies, since Maven downloads dependencies automatically when
they are needed. Also, since Maven dependencies (unlike NPM packages) don't need
to be stored in a repo-local directory and don't perform any post-download build
steps etc, just using a mounted cache folder for the ~/.m2 directory will
be the only optimization we need.
You can download the dependencies separately by invoking ./mvnw dependency:go-offline
but there's less need for it (although it could be nice just to see that
everything downloads properly). If you decide to do so, remember that every RUN
step that invokes ./mvnw needs to mount the ~/.m2 cache directory in the
same way.
- To build the app:
docker build . --target=app
... then start a container:
docker run --rm -p8080:8080 sha256:...
The app is now running on http://localhost:8080 (where it responds to any request with a 404 page) - To run the tests and extract the test reports:
docker build . --target=test-reports --output type=local,dest=test-reports
Test reports are now available in the./test-reports/directory, regardless of whether tests passed or not.