The javax to jakarta package rename is the hard part of the Spring Boot 3 upgrade. Why the one-line sed trick quietly breaks javax.sql and javax.crypto, which packages actually move, and how OpenRewrite does the whole migration for you. Tested on real apps.
How to find top used shell commands in Linux of macOS terminal.
Autowire all beans implementing an interface into one field: a List or array ordered with @Order, a Set, or a Map<String, T> keyed by bean name. Runnable code.
Find reasoning and motivation to write unit tests for your application.
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How Lombok @RequiredArgsConstructor gives Spring Boot constructor injection: final fields, no @Autowired, no boilerplate. Maven and Gradle setup, plus one warning.
