Aparna pradhan build issues

[AparnaPradhan]

Title:
Fix application startup failures: Firebase, Java version, and infrastructure setup

Description:

Summary

• Make Firebase push notification configuration optional so the app starts without forums-firebase.json
• Add no-op fallback FireBaseMessagingService when Firebase credentials are not present
• Document infrastructure prerequisites (PostgreSQL, Keycloak) required to run the application

Changes

Firebase (conditional startup)

• FireBaseMessagingConfiguration — added @ConditionalOnResource so the Firebase bean is only created when forums-firebase.json exists on the classpath
• FireBaseMessagingServiceImpl — added @ConditionalOnBean(FirebaseMessaging.class) so it is only registered when Firebase is configured

Summary

• Make Firebase push notification configuration optional so the app starts without forums-firebase.json
• Add no-op fallback FireBaseMessagingService when Firebase credentials are not present
• Document infrastructure prerequisites (PostgreSQL, Keycloak) required to run the application

Changes

Firebase (conditional startup)

• FireBaseMessagingConfiguration — added @ConditionalOnResource so the Firebase bean is only created when forums-firebase.json exists on the classpath
• FireBaseMessagingServiceImpl — added @ConditionalOnBean(FirebaseMessaging.class) so it is only registered when Firebase is configured
• FireBaseMessagingServiceNoOpImpl (new) — no-op fallback that satisfies the FireBaseMessagingService dependency and logs a warning when Firebase is not
  configured

Infrastructure setup

The application requires the following services running before startup:

• PostgreSQL on localhost:5432 — start with docker compose -f src/main/docker/postgresql.yml up -d
• Keycloak on localhost:9080 — start with docker compose -f src/main/docker/keycloak.yml up -d
• Run with mvn spring-boot:run -Denforcer.skip=true if using JDK 15+