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

Upgraded all 7 microservices from Spring Boot 2.7.x to Spring Boot 3.3.13 with compatible Spring Cloud 2023.0.6. This is a major version upgrade that includes mandatory breaking changes for Spring Boot 3 compatibility:

Version Changes:

• Spring Boot: 2.7.14/2.7.15 → 3.3.13
• Spring Cloud: 2021.0.8 → 2023.0.6

Breaking Changes Addressed:

• Migrated all javax.persistence.* → jakarta.persistence.* (JPA entities)
• Migrated javax.transaction.* → jakarta.transaction.* (transaction annotations)
• Updated GlobalExceptionHandler to use HttpStatusCode instead of HttpStatus in method signatures (Spring Boot 3 API change)
• Removed deprecated @EnableEurekaClient annotations (auto-configuration replaces this in Spring Cloud 2022.x+)
• Replaced Apache Commons IOUtils with Java 10+ Reader.transferTo() (dependency was dropped in Boot 3)
• Removed unnecessary javax.ws.rs exclusion from User-Service

Services Modified:

• Service-Registry ✓ (compiled + tested)
• Sequence-Generator ✓ (compiled + tested)
• API-Gateway ✓ (compiled + tested)
• User-Service ✓ (compiled, tests require DB)
• Account-Service ✓ (compiled, tests require DB)
• Fund-Transfer ✓ (compiled, tests require DB)
• Transaction-Service ✓ (compiled, tests require DB)

Review & Testing Checklist for Human

⚠️ CRITICAL: This PR compiles successfully but has NOT been runtime tested with the full microservices stack.

• Start all services with MySQL and Keycloak running - Verify User-Service, Account-Service, Fund-Transfer, and Transaction-Service connect to databases successfully with the jakarta.* migration
• Verify service discovery works - Test that services still register with Eureka after removing @EnableEurekaClient (should auto-configure)
• Test Feign error handling - The IOUtils.toString() → Reader.transferTo() change in FeignClientErrorDecoder needs verification with actual error responses from inter-service calls
• Run end-to-end test flows - Test complete user journeys through API Gateway → services to ensure no subtle breaking changes
• Check Keycloak integration - Verify the Keycloak admin client (v21.0.1) works with Spring Boot 3.3.13

Test Plan Recommendation

1. Start Service-Registry first
2. Start all other services and verify Eureka registration
3. Test user creation/login through User-Service
4. Test account operations through Account-Service
5. Test fund transfers through Fund-Transfer service
6. Verify all transactions are recorded in Transaction-Service
7. Test error scenarios to verify Feign error decoder still works

Notes

• All services compile successfully ✓
• Tests pass for Service-Registry, Sequence-Generator, and API-Gateway ✓
• Spring Cloud 2023.0.8 does not exist on Maven Central, corrected to 2023.0.6
• Java 17 (already configured) is compatible with Spring Boot 3.3.13

Link to Devin run: https://app.devin.ai/sessions/8ecde93625564f258f04e2d54c7657a2
Requested by: Sam Fertig (@samfert-codeium)

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