WELD-2755 Remove usage of ThreadGroup from Weld executors

environments/se/tests/src/test/java/org/jboss/weld/environment/se/test/event/options/timeout/IncompleteCustomExecutorServices.java

@@ -32,7 +32,7 @@ public class IncompleteCustomExecutorServices extends AbstractExecutorServices {
     static final String PREFIX = "weld-worker-test";
 
     private final transient ExecutorService taskExecutor = Executors
-        .newSingleThreadExecutor(new DaemonThreadFactory(new ThreadGroup(DaemonThreadFactory.WELD_WORKERS), PREFIX));
+            .newSingleThreadExecutor(new DaemonThreadFactory(PREFIX));
 
     public ExecutorService getTaskExecutor() {
         return taskExecutor;

impl/src/main/java/org/jboss/weld/bootstrap/events/ContainerLifecycleEventPreloader.java

@@ -55,7 +55,8 @@ public Void call() throws Exception {
     private final ObserverNotifier notifier;
 
     public ContainerLifecycleEventPreloader(int threadPoolSize, ObserverNotifier notifier) {
-        this.executor = Executors.newFixedThreadPool(threadPoolSize, new DaemonThreadFactory(new ThreadGroup("weld-preloaders"), "weld-preloader-"));
+        this.executor = Executors.newFixedThreadPool(threadPoolSize,
+                new DaemonThreadFactory("weld-preloader-"));
         this.notifier = notifier;
     }
 

impl/src/main/java/org/jboss/weld/executor/AbstractExecutorServices.java

@@ -40,8 +40,8 @@ public abstract class AbstractExecutorServices implements ExecutorServices {
 
     private static final long SHUTDOWN_TIMEOUT = 60L;
 
-    private final ScheduledExecutorService timerExecutor =
-        Executors.newScheduledThreadPool(1, new DaemonThreadFactory(new ThreadGroup(DaemonThreadFactory.WELD_WORKERS), "weld-timer-"));
+    private final ScheduledExecutorService timerExecutor = Executors.newScheduledThreadPool(1,
+            new DaemonThreadFactory("weld-timer-"));
 
     /**
      * Returns a singleton instance of ScheduledExecutorService.

impl/src/main/java/org/jboss/weld/executor/DaemonThreadFactory.java

@@ -26,20 +26,16 @@
  */
 public class DaemonThreadFactory implements ThreadFactory {
 
-    public static final String WELD_WORKERS = "weld-workers";
-
     private final AtomicInteger threadNumber = new AtomicInteger(1);
     private final String threadNamePrefix;
-    private final ThreadGroup threadGroup ;
 
-    public DaemonThreadFactory(ThreadGroup threadGroup, String threadNamePrefix) {
-        this.threadGroup = threadGroup;
+    public DaemonThreadFactory(String threadNamePrefix) {
         this.threadNamePrefix = threadNamePrefix;
     }
 
     @Override
     public Thread newThread(Runnable r) {
-        Thread thread = new Thread(threadGroup, r, threadNamePrefix + threadNumber.getAndIncrement());
+        Thread thread = new Thread(r, threadNamePrefix + threadNumber.getAndIncrement());
         thread.setDaemon(true);
         return thread;
     }

impl/src/main/java/org/jboss/weld/executor/FixedThreadPoolExecutorServices.java

@@ -36,7 +36,8 @@ public class FixedThreadPoolExecutorServices extends AbstractExecutorServices {
 
     public FixedThreadPoolExecutorServices(int threadPoolSize) {
         this.threadPoolSize = threadPoolSize;
-        this.executor = Executors.newFixedThreadPool(threadPoolSize, new DaemonThreadFactory(new ThreadGroup(DaemonThreadFactory.WELD_WORKERS), "weld-worker-"));
+        this.executor = Executors.newFixedThreadPool(threadPoolSize,
+                new DaemonThreadFactory("weld-worker-"));
         BootstrapLogger.LOG.threadsInUse(threadPoolSize);
     }
 

impl/src/main/java/org/jboss/weld/executor/TimingOutFixedThreadPoolExecutorServices.java

@@ -46,7 +46,7 @@ public TimingOutFixedThreadPoolExecutorServices(int threadPoolSize, long keepAli
         this.executor = new ThreadPoolExecutor(threadPoolSize, threadPoolSize,
                 keepAliveTime, TimeUnit.SECONDS,
                 new LinkedBlockingQueue<Runnable>(),
-                new DaemonThreadFactory(new ThreadGroup(DaemonThreadFactory.WELD_WORKERS), "weld-worker-"));
+                new DaemonThreadFactory("weld-worker-"));
         // Terminate threads if no new tasks arrive within the keep-alive time
         this.executor.allowCoreThreadTimeOut(true);
 

tests-arquillian/src/test/java/org/jboss/weld/tests/event/async/stage/CustomExecutorServices.java

@@ -27,7 +27,7 @@ public class CustomExecutorServices extends AbstractExecutorServices {
     static final String PREFIX = "weld-worker-test";
 
     private final transient ExecutorService taskExecutor = Executors
-            .newSingleThreadExecutor(new DaemonThreadFactory(new ThreadGroup(DaemonThreadFactory.WELD_WORKERS), PREFIX));
+            .newSingleThreadExecutor(new DaemonThreadFactory(PREFIX));
 
     /**
      * Provides access to the executor service used for asynchronous tasks.