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Spring & Spring Boot Tutorial

Boot foundations

Spring Framework manages application objects and infrastructure; Spring Boot supplies conditional assembly and application startup around that framework.

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

Continue learning

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

Curriculum

Inspect the contract and its failure cases.

  1. 1Spring Boot application bootstrap: package boundaries and startup failures
  2. 2Spring Boot auto-configuration: conditions and user-defined beans
  3. 3Spring Boot configuration properties: bind values and reject bad startup input
  4. 4Spring Boot profiles and property precedence: test the selected environment

Follow the input contract, inspect failures and run the checked source.

  1. 1Spring Boot auto-configuration: register imports and let a user bean win

Check the boundary and follow the related lessons.

  1. 1Spring Boot property override: fail startup on the effective value

Check effective settings and staged database writes.

  1. 1Spring Boot command-line properties: test the effective value at startup
  2. 2Spring Boot Duration binding: make timeout units explicit
  3. 3Spring Boot configuration validation: reject an unusable relay before work starts
  4. 4Spring Boot configuration sources: test each deployment path, not a guessed order

Check loaded settings and the receipt migration sequence.

  1. 1Spring Boot external config file: bind the value the process actually loads
  2. 2Spring Boot file versus command line: assert the bound result
  3. 3Spring Boot config validation: separate valid syntax from a safe relay setting
  4. 4Spring Boot and Flyway: choose who runs migrations before traffic starts

Check selected settings and the staged database startup path.

  1. 1Spring Boot profile files: bind only the selected environment override
  2. 2Spring Boot config import: fail startup when a required file is missing
  3. 3Spring Boot optional config import: know which default survives
  4. 4Spring Boot config source priority: a builder default may lose to a packaged file

Follow the boundary from local fixtures to a release test.

  1. 1Spring Boot environment variables: bind the intended key, not a lookalike
  2. 2Spring Boot relative config imports: resolve from the declaring file

Five child-JVM checks for environment, CLI, validation and relative imports.

  1. 1Spring Boot environment binding: prove the value in a child JVM
  2. 2Spring Boot config precedence: command line beats a process variable
  3. 3Spring Boot environment validation: fail before a worker starts
  4. 4Spring Boot relative config import: change the working directory and inspect the value
  5. 5Spring Boot required import: fail when a relative file is missing

Checked second-hop imports, file-per-key trees and extensionless files.

  1. 1Spring Boot nested config imports: each file becomes the next base directory
  2. 2Spring Boot nested import failure: a missing second hop must stop startup
  3. 3Spring Boot configtree: bind one file per property in a child JVM
  4. 4Spring Boot configtree versus environment: assert the effective value
  5. 5Spring Boot required configtree: reject an absent directory
  6. 6Spring Boot configtree validation: reject a present but unsafe value
  7. 7Spring Boot extensionless config file: give the loader a properties hint
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