Slow Application Startup on Replit
Your app takes 30+ seconds to start, making development slow and deployments take forever. Startup time is unacceptable.
Spring Boot's autoconfiguration and component scanning cause slow initialization.
Common Causes
- Large number of beans and autoconfiguration
- Component scanning entire classpath
- Eager database connection initialization
- Loading all data on startup
- Hibernate scanning all entities
How to Fix It
Use spring-boot-starter-webflux for async. Defer non-critical beans with @Lazy. Exclude unnecessary autoconfiguration: @SpringBootApplication(exclude={...}). Move startup data loading to lazy-loaded service. Use spring.jpa.properties.hibernate.hbm2ddl.auto=validate instead of create/update. Profile startup with --debug flag.
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Get HelpFrequently Asked Questions
How do I measure startup time?
Use ./gradlew bootRun and check 'Started YourApp in X seconds'
Which beans can I mark @Lazy?
Non-critical services like schedulers, batch processors, external integrations