What would you do if Spring disappeared for a week?
summary
Thought experiment: remove Spring for a week and build two or three microservices using concrete alternatives and hand wiring. Uses MicroProfile or Jakarta EE on WildFly/Thorntail, or an OSGi + Karaf runtime; runs REST with Jetty+Jersey or Ratpack, persistence via JPA/Hibernate or JDBI, config with Typesafe Config, tracing to Zipkin and metrics/health checks wired manually. Demonstrates a packaged runnable app (boots with ASCII banner), Zipkin shows real traces, most features work but transactions and security remain the hardest parts to get right without Spring.
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