unexpected exception when panning the map

[richlv]

data, slippymap, wms and a couple of gpx layers; images added & one open.

panning the view with right mouse button :

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2010-10-06 01:31:17
Last Changed Author: bastiK
Revision: 3592
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2010-10-05 20:34:31 +0200 (Tue, 05 Oct 2010)
Last Changed Rev: 3592

Identification: JOSM/1.5 (3592 en)
Memory Usage: 764 MB / 764 MB (526 MB allocated, but free)
Java version: 1.6.0_22, Sun Microsystems Inc., Java HotSpot(TM) Server VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: PicLayer (24308)
Plugin: SimplifyArea (21873)
Plugin: livegps (21706)
Plugin: osmarender (22765)
Plugin: remotecontrol (22734)
Plugin: routing (22549)
Plugin: slippymap (22848)
Plugin: wmsplugin (24221)

java.lang.NullPointerException
	at javax.swing.ToolTipManager.initiateToolTip(ToolTipManager.java:477)
	at javax.swing.ToolTipManager.mouseEntered(ToolTipManager.java:434)
	at java.awt.AWTEventMulticaster.mouseEntered(AWTEventMulticaster.java:282)
	at java.awt.AWTEventMulticaster.mouseEntered(AWTEventMulticaster.java:282)
	at java.awt.AWTEventMulticaster.mouseEntered(AWTEventMulticaster.java:282)
	at java.awt.Component.processMouseEvent(Component.java:6276)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
	at org.openstreetmap.josm.gui.dialogs.LayerListDialog$LayerList.processMouseEvent(LayerListDialog.java:1096)
	at java.awt.Component.processEvent(Component.java:6032)
	at java.awt.Container.processEvent(Container.java:2041)
	at java.awt.Component.dispatchEventImpl(Component.java:4630)
	at java.awt.Container.dispatchEventImpl(Container.java:2099)
	at java.awt.Component.dispatchEvent(Component.java:4460)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
	at java.awt.LightweightDispatcher.trackMouseEnterExit(Container.java:4366)
	at java.awt.LightweightDispatcher.eventDispatched(Container.java:4500)
	at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2353)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2245)
	at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2203)
	at java.awt.Component.dispatchEventImpl(Component.java:4528)
	at java.awt.Container.dispatchEventImpl(Container.java:2099)
	at java.awt.Component.dispatchEvent(Component.java:4460)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4255)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
	at java.awt.Container.dispatchEventImpl(Container.java:2085)
	at java.awt.Window.dispatchEventImpl(Window.java:2478)
	at java.awt.Component.dispatchEvent(Component.java:4460)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

[Don-vip]

It's not a JOSM bug, but this JDK bug: ​http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6219960