Spring Boot: Developer — Lesson 1: Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle

Learning Objectives

• Break down the prerequisites, components, roles, and decision points involved in Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle.
• Complete a controlled activity for Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle and capture Spring Boot project baseline and configuration-profile test.
• Challenge the result with environment-specific properties being overridden by an unexpected configuration source, then justify the corrective action.

Detailed Topics

• Spring and Spring Boot fundamentals
• Dependency injection
• Beans
• Auto-configuration
• Starters
• Project structure
• Profiles
• External configuration
• And application lifecycle
• Decision ownership, prerequisites, and acceptance evidence for Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle
• Relevant access, security, capacity, dependency, performance, recovery, and support considerations

Instructor Demonstration

The instructor builds a representative scenario for Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle, narrating each decision and showing how it contributes to a maintainable Spring Boot application with clean configuration, tested REST APIs, reliable data access, observable runtime behavior, secure deployment practices, and repeatable delivery. The demonstration records Spring Boot project baseline and configuration-profile test so learners can compare design intent with observable behavior.

Hands-On Exercise

Build or execute Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle for a defined scenario. Introduce the condition “environment-specific properties being overridden by an unexpected configuration source,” inspect the evidence, correct the cause without discarding the audit trail, and document the accepted state in Spring Boot project baseline and configuration-profile test.

1. Record the starting state, assumptions, identities, topology, and expected outcome.
2. Execute the planned workflow and collect evidence at each material checkpoint.
3. Test one valid path, one boundary condition, and the stated failure scenario.
4. Document the correction, retest result, rollback option, and follow-up owner.

Scenario Analysis

• Clarify the service trigger, affected components and roles, prerequisites, and acceptable result for Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle.
• Compare at least two implementation or correction choices and identify which evidence would distinguish them.
• Decide how Spring Boot project baseline and configuration-profile test should be reviewed, approved, retained, and handed to the next owner.

Troubleshooting Guidance

When Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle produces an unexpected result, reproduce the issue with the same scope, identity, workload, and time context. Inspect Spring Boot project baseline and configuration-profile test, test whether “environment-specific properties being overridden by an unexpected configuration source” explains the evidence, apply the smallest reversible correction, and retest an unaffected path for regression.

Validation Checklist

• The requirement for Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle is linked to an owner and observable acceptance condition.
• Spring boot project baseline and configuration-profile test contains enough detail for another practitioner to repeat the check.
• Normal operation, one boundary condition, and the identified failure path have been tested.
• Access, security, downstream impact, rollback, monitoring, and support ownership are recorded.

Lesson Outcome

Learners can apply Spring and Spring Boot fundamentals, dependency injection, beans, auto-configuration, starters, project structure, profiles, external configuration, and application lifecycle, explain the decisions made, and defend the result with Spring Boot project baseline and configuration-profile test.