Merge pull request #42794 from zakkak/2024-08-27-fix-NPE

Avoid `NullPointerException`s when application fails to start

core/runtime/src/main/java/io/quarkus/runtime/ApplicationLifecycleManager.java

@@ -452,13 +452,15 @@ public void run() {
  }
  //take a reliable reference before changing the application state:
  final Application app = currentApplication;
- if (app.isStarted()) {
- // On CLI apps, SIGINT won't call io.quarkus.runtime.Application#stop(),
- // making the awaitShutdown() below block the application termination process
- // It should be a noop if called twice anyway
- app.stop();
+ if (app != null) {
+ if (app.isStarted()) {
+ // On CLI apps, SIGINT won't call io.quarkus.runtime.Application#stop(),
+ // making the awaitShutdown() below block the application termination process
+ // It should be a noop if called twice anyway
+ app.stop();
+ }
+ app.awaitShutdown();
  }
- app.awaitShutdown();
  currentApplication = null;
  System.out.flush();
  System.err.flush();