Deadlock while starting unit tests

[michael2402]

Just encountered a deadlock while trying to start unit tests. It happens every time. If you enable headless mode, everything works fine.

MapRendererPerformanceTest [JUnit]	
	org.eclipse.jdt.internal.junit.runner.RemoteTestRunner at localhost:42318 (Suspended)	
		Daemon System Thread [Signal Dispatcher] (Suspended)	
		Daemon System Thread [Finalizer] (Suspended)	
		Daemon System Thread [Reference Handler] (Suspended)	
		Thread [main] (Suspended)	
		Thread [ReaderThread] (Suspended)	
		Daemon Thread [Thread-1] (Suspended)	
		Daemon System Thread [Java2D Disposer] (Suspended)	
		Daemon System Thread [AWT-XAWT] (Suspended)	
		System Thread [AWT-Shutdown] (Suspended)	
		Thread [AWT-EventQueue-0] (Suspended)	
			Unsafe.park(boolean, long) line: not available [native method]	
			LockSupport.park(Object) line: 175	
			FutureTask<V>.awaitDone(boolean, long) line: 429	
			FutureTask<V>.get() line: 191 [local variables unavailable]	
			ThreadPoolExecutor(AbstractExecutorService).invokeAll(Collection<Callable<T>>) line: 244	
			MainApplication(Main).initialize() line: 559	
			JOSMFixture.setupGUI() line: 150	
			JOSMFixture.access$0(JOSMFixture) line: 140	
			JOSMFixture$1.run() line: 129	
			InvocationEvent.dispatch() line: 301	
			EventQueue.dispatchEventImpl(AWTEvent, Object) line: 756	
			EventQueue.access$500(EventQueue, AWTEvent, Object) line: 97	
			EventQueue$3.run() line: 709	
			EventQueue$3.run() line: 703	
			AccessController.doPrivileged(PrivilegedAction<T>, AccessControlContext) line: not available [native method]	
			ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(PrivilegedAction<T>, AccessControlContext, AccessControlContext) line: 76	
			EventQueue.dispatchEvent(AWTEvent) line: 726	
			EventDispatchThread.pumpOneEventForFilters(int) line: 201	
			EventDispatchThread.pumpEventsForFilter(int, Conditional, EventFilter) line: 116	
			EventDispatchThread.pumpEventsForHierarchy(int, Conditional, Component) line: 105	
			EventDispatchThread.pumpEvents(int, Conditional) line: 101	
			EventDispatchThread.pumpEvents(Conditional) line: 93	
			EventDispatchThread.run() line: 82	
		Thread [File Watcher] (Suspended)	
		Daemon System Thread [TimerQueue] (Suspended)	
		Thread [main-init-1] (Suspended)	
			owns: Class<T> (org.openstreetmap.josm.gui.conflict.tags.CombinePrimitiveResolverDialog) (id=54)	
			owns: Class<T> (org.openstreetmap.josm.tools.RightAndLefthandTraffic) (id=55)	
			waiting for: EventQueue$1AWTInvocationLock  (id=53)	
			Object.wait(long) line: not available [native method]	
			EventQueue$1AWTInvocationLock(Object).wait() line: 502	
			EventQueue.invokeAndWait(Object, Runnable) line: 1315	
			EventQueue.invokeAndWait(Runnable) line: 1296	
			SwingUtilities.invokeAndWait(Runnable) line: 1348	
			GuiHelper.runInEDTAndWait(Runnable) line: 119	
			CombinePrimitiveResolverDialog.getInstance() line: 101	
			CombinePrimitiveResolverDialog.launchIfNecessary(TagCollection, Collection<OsmPrimitive>, Collection<OsmPrimitive>) line: 518	
			CombineWayAction.combineWaysWorker(Collection<Way>) line: 184	
			JoinAreasAction.joinOrientedWays(List<WayInPolygon>) line: 1339	
			JoinAreasAction.joinWays(List<WayInPolygon>) line: 1304	
			JoinAreasAction.joinPolygon(JoinAreasAction$AssembledMultipolygon) line: 1275	
			JoinAreasAction.joinAreas(List<Multipolygon>) line: 668	
			RightAndLefthandTraffic.computeOptimizedBoundaries() line: 112	
			RightAndLefthandTraffic.initialize() line: 67	
			1671376799.run() line: not available	
			Main$InitializationTask.call() line: 605	
			Main$InitializationTask.call() line: 1	
			FutureTask<V>.run() line: 266	
			ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker) line: 1142	
			ThreadPoolExecutor$Worker.run() line: 617	
			Thread.run() line: 745	
		Thread [main-init-0] (Suspended)	
		Thread [main-init-3] (Suspended)	
		Thread [main-init-4] (Suspended)	
		Thread [main-init-2] (Suspended)	
		Thread [main-init-5] (Suspended)	
	/usr/lib/jvm/java-8-openjdk-amd64/bin/java (05.03.2017, 17:55:40)	

Build-Date:2017-03-05 17:38:12
Revision:11691
Is-Local-Build:true

Identification: JOSM/1.5 (11691 SVN en) Linux Ubuntu 14.04.5 LTS
Memory Usage: 541 MB / 3559 MB (356 MB allocated, but free)
Java version: 1.8.0_111-8u111-b14-3~14.04.1-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 1920x1080, :0.1 1920x1080
Maximum Screen Size: 1920x1080
Java package: openjdk-8-jre:amd64-8u111-b14-3~14.04.1
Java ATK Wrapper package: libatk-wrapper-java:all-0.30.4-4
VM arguments: [-Dfile.encoding=UTF-8]
Program arguments: [--trace]

[Don-vip]

In 11772/josm:

fix #14475 - Deadlock while starting unit tests: remove the need to construct a CombinePrimitiveDialog to detect conflicts