It's a kind of magic: under the covers of Spring Boot
summary
Shows how to build a real Spring Boot starter: an "ello" library plus an auto-configuration registered via spring.factories, unit tests that load contexts with and without user beans, and properties bound with @ConfigurationProperties enabled by the spring-boot-configuration-processor. Demonstrates using ConditionalOnMissingBean and conditional-on-class/property hooks, a custom Condition and FailureAnalyzer, and an EnvironmentPostProcessor to pull local files into the Environment. Gives concrete perf numbers (classpath scanning ~100ms reduced to ~8ms with generated metadata) and lists common startup traps (DNS/hosts, AV, entropy).
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chapters (13)
- 0:00Intro
- 2:48Lets get started
- 8:32Annotations
- 15:50User Configuration
- 26:33Recap
- 27:27Hello Auto Configuration
- 30:52Convention over Configuration
- 31:23Testing
- 33:33Making the configuration smarter
- 36:51Object model thread
- 48:41Summary
- 53:49Enable Auto Configuration
- 57:39Break
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