michaelandrepearce commented on a change in pull request #2517: [ARTEMIS-2171]: 
ThreadPoolExecutor leak under SM due to lack of privileged block.
URL: https://github.com/apache/activemq-artemis/pull/2517#discussion_r250701848
 
 

 ##########
 File path: 
artemis-commons/src/main/java/org/apache/activemq/artemis/core/server/ActiveMQScheduledComponent.java
 ##########
 @@ -153,7 +153,12 @@ public synchronized void start() {
    }
 
    protected ActiveMQThreadFactory getThreadFactory() {
-      return new ActiveMQThreadFactory(this.getClass().getSimpleName() + 
"-scheduled-threads", false, getThisClassLoader());
+      return AccessController.doPrivileged(new 
PrivilegedAction<ActiveMQThreadFactory>() {
+         @Override
+         public ActiveMQThreadFactory run() {
+            return new ActiveMQThreadFactory(this.getClass().getSimpleName() + 
"-scheduled-threads", false, getThisClassLoader());
 
 Review comment:
   Threads created by ActiveMQThreadFactory should be already created by 
doPrivileged. how are we sure its not just that the thread issues you are 
seeing are maybe just where code isn't using ActiveMQThreadFactory
   
   see in ActiveMQThreadFactory
   
   ```
      @Override
      public Thread newThread(final Runnable command) {
         // create a thread in a privileged block if running with Security 
Manager
         if (acc != null) {
            return AccessController.doPrivileged(new 
ThreadCreateAction(command), acc);
         } else {
            return createThread(command);
         }
      }
   ```

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