Fixes #3409

The old config provider resolver was not being restored
on shutdown, which would cause problems on restarts.

core/devmode/src/main/java/io/quarkus/dev/DevModeMain.java

@@ -255,9 +255,12 @@ public void stop() {
     }
 
     public void close() {
-        stop();
-        for (HotReplacementSetup i : hotReplacement) {
-            i.close();
+        try {
+            stop();
+        } finally {
+            for (HotReplacementSetup i : hotReplacement) {
+                i.close();
+            }
         }
     }
 }

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

@@ -4,6 +4,7 @@
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.LockSupport;
 
+import org.eclipse.microprofile.config.spi.ConfigProviderResolver;
 import org.graalvm.nativeimage.ImageInfo;
 import org.wildfly.common.Assert;
 import org.wildfly.common.lock.Locks;
@@ -37,6 +38,12 @@ public abstract class Application {
     private volatile boolean shutdownRequested;
     private static volatile Application currentApplication;
 
+    /**
+     * The generated config code will install a new resolver, we save the original one here and make sure
+     * to restore it on shutdown.
+     */
+    private final static ConfigProviderResolver originalResolver = ConfigProviderResolver.instance();
+
     /**
      * Construct a new instance.
      */
@@ -151,6 +158,7 @@ public final void stop() {
             doStop();
         } finally {
             currentApplication = null;
+            ConfigProviderResolver.setInstance(originalResolver);
             stateLock.lock();
             try {
                 state = ST_STOPPED;