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Exercises

Reproduce and repair failures

A Spring boundary exercise checks a deliberate application mutation against an observable contract.

Learning roadmap

Read the contract, run the source-kit checks, and inspect a rejected input before extending the application. This subject covers Spring and Spring Boot together; Java language lessons remain in their own subject.

Prerequisites

Use Java object ownership, interfaces, exceptions and Maven builds before the framework-specific lessons.

Section lessons

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Boot Foundations, Spring Core, Web APIs, Data & Transactions, Security, Testing, Production, Quizzes, Projects.

Curriculum

Inspect the contract and its failure cases.

  1. 1Spring exercises: repair validation, ownership and rollback failures

Trace both accepted and rejected tenant requests.

  1. 1Spring security exercise: trace four JWT request outcomes
  2. 2Spring data exercise: repair a receipt query missing its tenant predicate

Trace a tenant-scoped command from token to committed rows.

  1. 1Spring exercise: trace tenant command replay, denial and rollback

Check byte, storage and operational health boundaries.

  1. 1Spring exercise: trace upload rejection and readiness changes

Trace ownership, retry and duplicate delivery boundaries.

  1. 1Spring exercise: predict outbox state across a lost acknowledgement

Trace scheduled claims, retries and duplicate-safe completion.

  1. 1Spring exercise: trace two poll ticks and a lost acknowledgement

Check effective settings and staged database writes.

  1. 1Spring exercise: predict startup and SQL states across a staged rollout

Check loaded settings and the receipt migration sequence.

  1. 1Spring exercise: predict file overrides and three migration versions

Check selected settings and the staged database startup path.

  1. 1Spring exercise: trace selected config and staged Boot migrations
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