--- a/ChangeLog	Wed Feb 18 18:47:18 2015 +0100
+++ b/ChangeLog	Tue Feb 24 16:17:28 2015 +0100
@@ -1,3 +1,11 @@
+2015-02-24  Jiri Vanek  <jvanek@redhat.com>
+
+	Marking threads in ResourceTracker's threadPool as daemons, so the dont prevent shutdown.
+	* netx/net/sourceforge/jnlp/cache/CachedDaemonThreadPoolProvider.java: new file,
+	implementation of ExecutorService singleton, whose threads are daemons.
+	* netx/net/sourceforge/jnlp/cache/ResourceTracker.java: (startDownloadThread)
+	now calls CachedDaemonThreadPoolProvider
+
 2015-02-18  Jiri Vanek  <jvanek@redhat.com>
 
 	Added menuentry to PolicyEditor to allow quicky open default java.policy

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netx/net/sourceforge/jnlp/cache/CachedDaemonThreadPoolProvider.java	Tue Feb 24 16:17:28 2015 +0100
@@ -0,0 +1,86 @@
+/*
+ Copyright (C) 2011 Red Hat, Inc
+
+ This file is part of IcedTea.
+
+ IcedTea is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ IcedTea is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with IcedTea; see the file COPYING.  If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301 USA.
+
+ Linking this library statically or dynamically with other modules is
+ making a combined work based on this library.  Thus, the terms and
+ conditions of the GNU General Public License cover the whole
+ combination.
+
+ As a special exception, the copyright holders of this library give you
+ permission to link this library with independent modules to produce an
+ executable, regardless of the license terms of these independent
+ modules, and to copy and distribute the resulting executable under
+ terms of your choice, provided that you also meet, for each linked
+ independent module, the terms and conditions of the license of that
+ module.  An independent module is a module which is not derived from
+ or based on this library.  If you modify this library, you may extend
+ this exception to your version of the library, but you are not
+ obligated to do so.  If you do not wish to do so, delete this
+ exception statement from your version. */
+package net.sourceforge.jnlp.cache;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class CachedDaemonThreadPoolProvider {
+
+    /**
+     * This is copypasted default factory from java.util.concurrent.Executors.
+     * The only difference is, that it creates daemon threads.
+     *
+     * Except creating new threads, the rest of class is complicated creation of
+     * name.
+     */
+    private static class DaemonThreadFactory implements ThreadFactory {
+
+        private static final AtomicInteger poolNumber = new AtomicInteger(1);
+        private final ThreadGroup group;
+        private final AtomicInteger threadNumber = new AtomicInteger(1);
+        private final String namePrefix;
+
+        DaemonThreadFactory() {
+            SecurityManager s = System.getSecurityManager();
+            group = (s != null) ? s.getThreadGroup()
+                    : Thread.currentThread().getThreadGroup();
+            namePrefix = "itwpool-"
+                    + poolNumber.getAndIncrement()
+                    + "-itwthread-";
+        }
+
+        @Override
+        public Thread newThread(Runnable r) {
+            Thread t = new Thread(group, r,
+                    namePrefix + threadNumber.getAndIncrement(),
+                    0);
+            if (!t.isDaemon()) {
+                t.setDaemon(true);
+            }
+            if (t.getPriority() != Thread.NORM_PRIORITY) {
+                t.setPriority(Thread.NORM_PRIORITY);
+            }
+            return t;
+        }
+    }
+
+    public static final ExecutorService DAEMON_THREAD_POOL = Executors.newCachedThreadPool(new DaemonThreadFactory());
+
+}

--- a/netx/net/sourceforge/jnlp/cache/ResourceTracker.java	Wed Feb 18 18:47:18 2015 +0100
+++ b/netx/net/sourceforge/jnlp/cache/ResourceTracker.java	Tue Feb 24 16:17:28 2015 +0100
@@ -32,8 +32,6 @@
 import java.util.Collection;
 import java.util.EnumSet;
 import java.util.List;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
 
 import net.sourceforge.jnlp.DownloadOptions;
 import net.sourceforge.jnlp.Version;
@@ -101,12 +99,10 @@
             return requestMethods;
         }
     }
-
-    /** notified on initialization or download of a resource */
+    
+      /** notified on initialization or download of a resource */
     private static final Object lock = new Object(); // used to lock static structures
 
-    private static final ExecutorService threadPool = Executors.newCachedThreadPool();
-
     /** the resources known about by this resource tracker */
     private final List<Resource> resources = new ArrayList<>();
 
@@ -510,7 +506,7 @@
      * </p>
      */
     protected void startDownloadThread(Resource resource) {
-        threadPool.execute(new ResourceDownloader(resource, lock));
+        CachedDaemonThreadPoolProvider.DAEMON_THREAD_POOL.execute(new ResourceDownloader(resource, lock));
     }
 
     static Resource selectByFilter(Collection<Resource> source, Filter<Resource> filter) {
@@ -633,4 +629,4 @@
     interface Filter<T> {
         public boolean test(T t);
     }
-}
+}
\ No newline at end of file