Simple error !!

[geofrizz@…]

What steps will reproduce the problem?

1. Update JOSM to the latest snapshot
2. Update plugins
3. Help/About

What is the expected result?

The "About" window

What happens instead?

Error message with a link to this page !!! :-)

Please provide any additional information below. Attach a screenshot if possible.

After restart of JOSM all ok, no error message.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2015-06-02 12:06:24
Last Changed Author: Don-vip
Revision: 8441
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Relative URL: ^/trunk
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2015-06-02 14:03:31 +0200 (Tue, 02 Jun 2015)
Last Changed Rev: 8441

Identification: JOSM/1.5 (8441 en) Linux Ubuntu 14.04.2 LTS
Memory Usage: 519 MB / 2656 MB (263 MB allocated, but free)
Java version: 1.7.0_79, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: openjdk-7-jre:amd64-7u79-2.5.5-0ubuntu0.14.04.2
VM arguments: [-Djosm.restart=true, -Djosm.home=/home/geofrizz/.josm-latest, -Djava.net.useSystemProxies=true]

Plugins:
- BuildingGeneralization (UNKNOWN)
- FixAddresses (30892)
- buildings_tools (31120)
- imagery_offset_db (31056)
- measurement (30892)
- merge-overlap (30988)
- pbf (31010)
- reltoolbox (31056)
- todo (29154)
- undelete (30892)
- utilsplugin2 (31153)
- waydownloader (30892)

Last errors/warnings:
- E: Failed to locate image 'icons/hot_camping.n.24.png'
- W: Could not get presets icon icons/hot_camping.n.24.png
- E: Failed to locate image ''
- W: Could not get presets icon 
- E: sun.awt.X11.XException: Cannot write XdndAware property

sun.awt.X11.XException: Cannot write XdndAware property
	at sun.awt.X11.XDnDDropTargetProtocol.registerDropTarget(XDnDDropTargetProtocol.java:97)
	at sun.awt.X11.XDropTargetRegistry.registerDropSite(XDropTargetRegistry.java:571)
	at sun.awt.X11.XWindowPeer.addDropTarget(XWindowPeer.java:1932)
	at sun.awt.X11.XComponentPeer.addDropTarget(XComponentPeer.java:1386)
	at java.awt.dnd.DropTarget.addNotify(DropTarget.java:509)
	at java.awt.Component.addNotify(Component.java:6924)
	at java.awt.Container.addNotify(Container.java:2758)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at java.awt.Container.addNotify(Container.java:2769)
	at javax.swing.JComponent.addNotify(JComponent.java:4744)
	at javax.swing.JRootPane.addNotify(JRootPane.java:756)
	at java.awt.Container.addNotify(Container.java:2769)
	at java.awt.Window.addNotify(Window.java:770)
	at java.awt.Dialog.addNotify(Dialog.java:760)
	at java.awt.Window.pack(Window.java:807)
	at javax.swing.JOptionPane.initDialog(JOptionPane.java:987)
	at javax.swing.JOptionPane.createDialog(JOptionPane.java:968)
	at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:867)
	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:667)
	at org.openstreetmap.josm.actions.AboutAction.actionPerformed(AboutAction.java:107)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)
	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
	at java.awt.Component.processMouseEvent(Component.java:6516)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3312)
	at java.awt.Component.processEvent(Component.java:6281)
	at java.awt.Container.processEvent(Container.java:2229)
	at java.awt.Component.dispatchEventImpl(Component.java:4872)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Component.dispatchEvent(Component.java:4698)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
	at java.awt.Container.dispatchEventImpl(Container.java:2273)
	at java.awt.Window.dispatchEventImpl(Window.java:2719)
	at java.awt.Component.dispatchEvent(Component.java:4698)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:747)
	at java.awt.EventQueue.access$300(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:706)
	at java.awt.EventQueue$3.run(EventQueue.java:704)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.awt.EventQueue$4.run(EventQueue.java:720)
	at java.awt.EventQueue$4.run(EventQueue.java:718)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:717)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
...<snip>...

[Don-vip]

Closed as duplicate of #9771.
This is a known bug of Java, please update to Java 8.