From b95bc5511bce1352ae1827676cd4ff628f056793 Mon Sep 17 00:00:00 2001
From: Diana Krepinska Vilkolakova <skyllarr@gmail.com>
Date: Tue, 19 Oct 2021 12:05:50 +0200
Subject: [PATCH] [ELY-2195] Use daemon threads in default
 ScheduledExecutorService

---
 .../org/wildfly/security/auth/server/SecurityDomain.java  | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/auth/server/base/src/main/java/org/wildfly/security/auth/server/SecurityDomain.java b/auth/server/base/src/main/java/org/wildfly/security/auth/server/SecurityDomain.java
index 93ba7e8d45f..5464b7989e6 100644
--- a/auth/server/base/src/main/java/org/wildfly/security/auth/server/SecurityDomain.java
+++ b/auth/server/base/src/main/java/org/wildfly/security/auth/server/SecurityDomain.java
@@ -33,6 +33,7 @@
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.function.Consumer;
@@ -1242,7 +1243,12 @@ private void assertNotBuilt() {
 
     private static class ScheduledExecutorServiceProvider {
 
-        private static final ScheduledThreadPoolExecutor INSTANCE = new ScheduledThreadPoolExecutor(1);
+        private static final ScheduledThreadPoolExecutor INSTANCE = new ScheduledThreadPoolExecutor(1, runnable -> {
+            // use daemon thread
+            Thread thread = Executors.defaultThreadFactory().newThread(runnable);
+            thread.setDaemon(true);
+            return thread;
+        });
 
         static {
             INSTANCE.setRemoveOnCancelPolicy(true);