Upgrade to Spring Boot 3.3.13 and Spring Cloud 2023.0.6

[devin-ai-integration]

Upgrade to Spring Boot 3.3.13 and Spring Cloud 2023.0.6

Summary

This PR upgrades all 7 microservices from Spring Boot 2.7.x to 3.3.13 and Spring Cloud 2021.0.8 to 2023.0.6. This is a major version upgrade that includes the mandatory javax → jakarta namespace migration and several breaking changes.

Changes made:

• Updated all 7 pom.xml files to Spring Boot 3.3.13 and Spring Cloud 2023.0.6
• Migrated javax.persistence → jakarta.persistence in 6 entity classes
• Migrated javax.transaction.Transactional → jakarta.transaction.Transactional in UserServiceImpl
• Removed @EnableEurekaClient annotation from 3 application classes (no longer needed in Spring Cloud 2022.0.0+)
• Updated GlobalExceptionHandler method signatures to use HttpStatusCode instead of HttpStatus in 3 services
• Added explicit commons-io:2.15.1 dependency to 3 services (Account-Service, Fund-Transfer, Transaction-Service) as it's no longer transitive in Spring Boot 3.x

Compilation & Testing:

• ✅ All 7 services compile successfully
• ✅ Tests pass for Service-Registry, Sequence-Generator, and API-Gateway
• ⚠️ User-Service, Account-Service, Fund-Transfer, and Transaction-Service tests require MySQL and Keycloak (not available in dev environment)

Review & Testing Checklist for Human

This is a HIGH RISK upgrade due to the major version jump. Please verify the following before merging:

• Deploy and test all 4 database-dependent services (User-Service, Account-Service, Fund-Transfer, Transaction-Service) in a full environment with MySQL and Keycloak running. Verify basic CRUD operations work.
• Test Feign client error handling: Verify that inter-service communication works correctly, especially error scenarios where FeignClientErrorDecoder uses the new commons-io dependency. Test failed API calls between services.
• Verify Keycloak integration: Test user authentication, authorization, and admin operations in User-Service. The current Keycloak client version (21.0.1) may need to be upgraded if compatibility issues arise.
• Verify service discovery: Confirm that all services register with Eureka Service Registry correctly without the @EnableEurekaClient annotation (should be auto-configured).
• Review Spring Security deprecations: API-Gateway has deprecation warnings for methods marked for removal (authorizeExchange, csrf, oauth2Login, etc.). While not blocking, consider addressing these in a follow-up to avoid future breakage.

Test Plan Recommendation

1. Start Service-Registry and Sequence-Generator
2. Start API-Gateway and verify it registers with Eureka
3. Start all database-dependent services (with MySQL and Keycloak running)
4. Test end-to-end flows: user creation, account operations, fund transfers, transaction queries
5. Test error scenarios to verify Feign client error handling with commons-io

Notes

• Link to Devin run: https://app.devin.ai/sessions/7148874172214a938b537337a800dc29
• Requested by: Sam Fertig (@samfert-codeium)
• Spring Boot 3.x is a major breaking change - while all obvious compatibility issues were addressed, additional runtime issues may surface
• Keycloak client library (21.0.1) compatibility with Spring Boot 3.3.13 was not verified and may need updating

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