Lab 09 — Build a Java consumer

Goal

A correct SDK v2 poll loop: long polling, batching, error isolation, batched deletes.

Setup

To be written — CLI commands and an IaC equivalent for every resource, all prefixed sqs-course-.

Steps

1. Build an SqsClient with the default credential provider
2. Write the poll loop: long poll 10 messages
3. Process each with per-message exception isolation
4. Accumulate successful receipt handles and batch-delete
5. Handle the Failed list from the delete
6. Add ApproximateReceiveCount to every log line
7. Run it against a queue with a deliberately failing message

What you should observe

• The failing message retries while the others complete
• A consumer that isolates per-message errors does not lose a batch to one bad item
• Receive count in the logs tells you which messages are struggling

Why it happened

To be written — ties each observation back to the mechanism in 04 — Sending and Receiving Messages.

Experiments to try

To be written — deliberate variations that change the outcome.

Teardown

To be written — every resource created above, in dependency order.

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