Migrate from Java 17 to Java 22

[devin-ai-integration]

Summary

This PR migrates the Spring Boot BankApp from Java 17 to Java 22 by updating the build configuration and Docker images.

Changes made:

• Updated java.version property from 17 to 22 in pom.xml
• Updated Maven compiler plugin source/target from 1.8 to 22 (fixing a pre-existing inconsistency)
• Updated Dockerfile build stage from maven:3.8.3-openjdk-17 to maven:3.9-eclipse-temurin-22-alpine
• Updated Dockerfile runtime stage from openjdk:17-alpine to eclipse-temurin:22-jre-alpine

Updates since last revision

• Replaced initially proposed Docker images with verified available alternatives from Docker Hub:
  • Build stage: maven:3.9-eclipse-temurin-22-alpine (confirmed available)
  • Runtime stage: eclipse-temurin:22-jre-alpine (confirmed available)

Review & Testing Checklist for Human

• Verify the Jenkins CI pipeline builds successfully with the new Java 22 configuration
• After CI passes, test the deployed application in a staging environment to ensure runtime compatibility
• Confirm Kubernetes deployment works with the new container image once built

Recommended test plan:

1. Wait for CI pipeline to complete and verify Docker build succeeds
2. Deploy to a test namespace and verify application starts correctly
3. Run basic smoke tests against the banking application endpoints

Notes

• The Maven compiler plugin version (3.8.0) was kept unchanged but supports Java 22
• Spring Boot 3.3.3 officially supports Java 17-22
• MySQL connector 8.0.33 is compatible with Java 22

Link to Devin run: https://app.devin.ai/sessions/bad81380c15e4415b931dda990d91d3a
Requested by: Satwik Bebortha (@satwik-cog)

[devin-ai-integration]

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