Migrate from Java 8 to Java 11 with Spring Boot 2.7.18

[devin-ai-integration]

Migrate from Java 8 to Java 11 with Spring Boot 2.7.18

Summary

This PR completes the migration from Java 8 to Java 11 as requested. The changes include:

• Java version: Updated from 1.8 to 11 in pom.xml
• Spring Boot upgrade: 2.1.4.RELEASE → 2.7.18 (required for Java 11 compatibility)
• Springfox upgrade: 2.9.2 → 3.0.0 with compatibility workarounds for Spring Boot 2.6+
• Test framework: Migrated from JUnit 4 to JUnit 5
• Configuration changes: Added path matching strategy and BeanPostProcessor for Springfox compatibility

Key Technical Changes

1. pom.xml: Updated Java version property and Spring Boot parent version; consolidated Springfox dependencies into single springfox-boot-starter
2. ApplicationConfig.java: Added BeanPostProcessor that filters out PathPatternParser-based handler mappings (Springfox 3.0.0 compatibility workaround)
3. application.yml: Added spring.mvc.pathmatch.matching-strategy: ant_path_matcher configuration
4. BankingApplicationTests.java: Migrated to JUnit 5 annotations

Review & Testing Checklist for Human

⚠️ IMPORTANT: The basic test suite passes, but this is a significant framework upgrade. Please perform thorough manual testing:

• Run the application locally and verify it starts without errors on Java 11
• Test Swagger UI: Access http://localhost:8989/bank-api/swagger-ui.html and verify API documentation loads correctly (Springfox was completely upgraded)
• Test core banking operations: Create customers, create accounts, perform deposits/withdrawals/transfers using the REST API
• Verify H2 console: Access http://localhost:8989/bank-api/h2-console/ and verify database connectivity
• Check for deprecation warnings: Review the application startup logs and build output for any deprecation warnings that might indicate future compatibility issues

Notes

• The BeanPostProcessor in ApplicationConfig.java uses reflection as a workaround for Springfox 3.0.0 compatibility with Spring Boot 2.6+. This is a known pattern but is somewhat fragile.
• The Spring Boot upgrade (2.1.4 → 2.7.18) is a 6 minor version jump. While the context loads successfully, there may be subtle behavioral changes in Spring Security, JPA, or other components.
• Compiled using Java 17 with target Java 11. Should be tested in actual Java 11 runtime environment if possible.

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Link to Devin run: https://app.devin.ai/sessions/7b3d02e01c2d4fb89e636fdb4ae612f7
Requested by: @jaime-leo (Jaime Mizrachi)

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