Deploy your Spring Boot app to Fly.io
Step-by-step deployment help for Spring Boot apps on Fly.io. We fix Spring Boot-specific deployment issues, configure Fly.io, and get your app live. From $19.
Spring Boot issues we fix before deploying
Common Spring Boot problems that affect Fly.io deployments.
Open actuator endpoints
Spring Boot Actuator endpoints like /actuator/env and /actuator/heapdump exposed without authentication, leaking environment variables, secrets, and heap memory.
Disabled Spring Security defaults
CSRF protection, CORS restrictions, and security headers disabled in SecurityFilterChain to 'make things work' during development and never re-enabled.
N+1 queries in JPA/Hibernate
Lazy-loaded entity relationships fetched inside loops, generating hundreds of individual SQL queries instead of proper JOIN FETCH or EntityGraph queries.
Missing @Transactional boundaries
Service methods that perform multiple database operations without transaction annotations, leaving data inconsistent if any step fails.
Fly.io deployment issues we check for
Common Fly.io problems that break Spring Boot apps in production.
Dockerfile missing or misconfigured
Fly.io requires a Dockerfile for deployment. AI tools that scaffold without one force flyctl to auto-generate a suboptimal Dockerfile that misses build steps.
Volume only available in a single region
Fly volumes are pinned to one region. Multi-region deployments try to access a volume that doesn't exist in other regions, causing crashes.
Machine restarts losing in-memory state
AI-generated apps store session data or caches in memory. Fly machines can restart or migrate, wiping all in-memory state without warning.
Internal DNS resolution failing between services
Services within a Fly organization communicate via <app>.internal hostnames, but AI-generated code hardcodes localhost or public URLs.
Start with a self-serve audit
Get a professional review of your Spring Boot project before deploying to Fly.io.
External Security Scan
Black-box review of your public-facing app. No code access needed.
- OWASP Top 10 vulnerability check
- SSL/TLS configuration analysis
- Security header assessment
- Expert review within 24h
Code Audit
In-depth review of your source code for security, quality, and best practices.
- Security vulnerability analysis
- Code quality review
- Dependency audit
- Architecture review
- Expert + AI code analysis
Complete Bundle
Both scans in one package with cross-referenced findings.
- Everything in both products
- Cross-referenced findings
- Unified action plan
100% credited toward any paid service. Start with an audit, then let us fix what we find.
How it works
Tell us about your app
Share your project details and what you need help with.
Expert + AI audit
A human expert assisted by AI reviews your code within 24 hours.
Launch with confidence
We fix what needs fixing and stick around to help.
Frequently asked questions
How do I deploy a Spring Boot app to Fly.io?
We handle Spring Boot deployments to Fly.io end to end. Start with our code audit ($19) to identify deployment blockers specific to your Spring Boot project, then we configure Fly.io, fix issues, and get your app live in production.
What Spring Boot issues affect Fly.io deployments?
Spring Boot projects commonly have open actuator endpoints and disabled spring security defaults. On Fly.io, these combine with dockerfile missing or misconfigured and volume only available in a single region to cause deployment failures.
Can SpringCode deploy my Spring Boot project to Fly.io?
Yes. We specialize in deploying Spring Boot applications to Fly.io. We audit your codebase for Spring Boot-specific issues, configure Fly.io correctly, and handle the full deployment so your app runs reliably in production.
What does Spring Boot deployment to Fly.io cost?
Our code audit ($19) identifies all Fly.io deployment blockers in your Spring Boot project. Full deployment assistance is scoped with a fixed quote after the audit — no hourly billing or surprise charges.
Related resources
Other techs on Fly.io
Deploy Spring Boot elsewhere
Need help deploying Spring Boot to Fly.io?
Tell us about your project. We'll respond within 24 hours with a clear plan and fixed quote.