Package a known working application before troubleshooting container behavior. Choose a compatible runtime image and make startup, configuration and shutdown predictable.
Before you begin
Be comfortable with variables, conditions, loops and basic methods. Use a small local project with a recorded JDK version and keep the input data fictional.
Work through the idea
Write the expected behavior before implementing the exercise. Keep the first version small enough to trace manually, then change one input or requirement. Record both the successful path and an invalid or empty-input case so that the result demonstrates reasoning rather than a copied output.
- Build the application artifact
- Use an appropriate runtime image
- Pass nonsecret configuration explicitly
Practice task
Containerize a sample greeting API and compare its response with the non-containerized version.
Check your result
Record startup, port, health-check expectations and behavior when configuration is absent.
A mistake to avoid
Do not copy a developer's entire workspace into the runtime image.
Keep a review note
Save the inputs or scenario, your reasoning and the result you checked. Explain one assumption and one case that needs more work. Revise the exercise after feedback and distinguish what you demonstrated from what remains untested.
Official reference for further study
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