Execute modernization plan: Upgrade to Java 21 and Spring Boot 3.4 LTS

[Copilot]

Executes the modernization plan from .github/modernize/001-upgrade-to-lts to upgrade the PhotoAlbum application to latest LTS versions.

Upgrades Applied

• Java: 8 → 21
• Spring Boot: 2.7.18 → 3.4.6 (via 3.3.13 milestone)
• Spring Framework: 5.x → 6.x
• Oracle JDBC: 21.5.0.0 → 23.5.0.24.07
• H2 Database: 2.1.214 → 2.3.232

Code Migrations

• Jakarta EE namespace migration: javax.* → jakarta.*
• Java 21 API modernization: !optional.isPresent() → optional.isEmpty(), list.get(0) → list.getFirst()

Execution Tracking

Created modernization-progress.md tracking task execution, success criteria validation, and build/test results per the modernization plan workflow.

Result: Build passes, 1/1 unit test passes. 6 files modified (16+/16-).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• repository.apache.org
  • Triggering command: /usr/lib/jvm/temurin-8-jdk-amd64/bin/java /usr/lib/jvm/temurin-8-jdk-amd64/bin/java -classpath /usr/share/apache-maven-3.9.12/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.12/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.12 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.12/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/PhotoAlbum-Java/PhotoAlbum-Java org.codehaus.plexus.classworlds.launcher.Launcher rewrite:run --quiet (dns block)
• repository.jboss.org
  • Triggering command: /usr/lib/jvm/temurin-8-jdk-amd64/bin/java /usr/lib/jvm/temurin-8-jdk-amd64/bin/java -classpath /usr/share/apache-maven-3.9.12/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.12/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.12 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.12/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/PhotoAlbum-Java/PhotoAlbum-Java org.codehaus.plexus.classworlds.launcher.Launcher rewrite:run --quiet (dns block)
• repository.ow2.org
  • Triggering command: /usr/lib/jvm/temurin-8-jdk-amd64/bin/java /usr/lib/jvm/temurin-8-jdk-amd64/bin/java -classpath /usr/share/apache-maven-3.9.12/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.12/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.12 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.12/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/PhotoAlbum-Java/PhotoAlbum-Java org.codehaus.plexus.classworlds.launcher.Launcher rewrite:run --quiet (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Call skill execute-modernization-plan to Execute modernization plan

Using the below context

• modernization-description: execute the upgrade plan
• modernization-work-folder: .github\modernize\001-upgrade-to-lts

This pull request contains changes made by the Modernization Cloud Coding Agent.

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