Update Java version from 1.8 to 11

[devin-ai-integration]

Update Java version from 1.8 to 11

Summary

This PR implements the first step of migrating the Spring Boot banking application from Java 8 to Java 11 by updating the Maven configuration:

• Updated java.version property from 1.8 to 11 in pom.xml
• Added explicit maven-compiler-plugin configuration with source and target set to Java 11

Local Testing Results:

• ✅ Baseline verification with Java 8: compilation and tests passed
• ✅ Compilation with Java 11: successful (mvn clean compile)
• ✅ Unit tests with Java 11: passed (1 test, 0 failures)

Review & Testing Checklist for Human

• Verify CI checks pass - This will confirm the CI environment supports Java 11
• Test application startup locally with Java 11 - Run mvn spring-boot:run and verify:
  • Application starts successfully on port 8989
  • Swagger UI is accessible at http://localhost:8989/bank-api/swagger-ui.html
  • H2 console is accessible at http://localhost:8989/bank-api/h2-console/
  • Basic API endpoints work (create customer, create account, etc.)
• Confirm deployment environments support Java 11 - Check that staging/production have JDK 11 available
• Consider extended testing - The codebase has limited test coverage (1 unit test), so manual functional testing is important to ensure no Java 11 compatibility issues

Notes

• Spring Boot 2.1.4 officially supports Java 11, so no framework upgrade is needed at this stage
• All dependencies (including Springfox Swagger 2.9.2/2.10.0 and Lombok) compiled successfully with Java 11
• This is the first step in the Java 11 migration plan for the banking application

Session Information:

• Link to Devin run: https://app.devin.ai/sessions/2c350e3123954ed79b74e584b1aaa253
• Requested by: Jaime Mizrachi (@jaime-leo)

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring