From 7c758c727a5ef32bf5936a98a76def28717bb1c7 Mon Sep 17 00:00:00 2001
From: Georgios Andrianakis <geoand@gmail.com>
Date: Mon, 13 Dec 2021 16:14:27 +0200
Subject: [PATCH] Provide meaningful error message when updating Quarkus in
 dev-mode

Closes: #22105
---
 .../deployment/dev/IsolatedDevModeMain.java        | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/core/deployment/src/main/java/io/quarkus/deployment/dev/IsolatedDevModeMain.java b/core/deployment/src/main/java/io/quarkus/deployment/dev/IsolatedDevModeMain.java
index 86b6770e72857..0792198e44625 100644
--- a/core/deployment/src/main/java/io/quarkus/deployment/dev/IsolatedDevModeMain.java
+++ b/core/deployment/src/main/java/io/quarkus/deployment/dev/IsolatedDevModeMain.java
@@ -334,12 +334,18 @@ public void close() {
         fsWatchUtil.shutdown();
         try {
             stop();
+            if (RuntimeUpdatesProcessor.INSTANCE == null) {
+                throw new IllegalStateException(
+                        "Hot deployment of the application is not supported when updating the Quarkus version. The application needs to be stopped and dev mode started up again");
+            }
         } finally {
             try {
-                try {
-                    RuntimeUpdatesProcessor.INSTANCE.close();
-                } catch (IOException e) {
-                    log.error("Failed to close compiler", e);
+                if (RuntimeUpdatesProcessor.INSTANCE != null) {
+                    try {
+                        RuntimeUpdatesProcessor.INSTANCE.close();
+                    } catch (IOException e) {
+                        log.error("Failed to close compiler", e);
+                    }
                 }
                 for (HotReplacementSetup i : hotReplacementSetups) {
                     i.close();