IllegalArgumentException: "null source" in unknown conditions (Mac OS X 10.8, JNLP, Java 7u25)

[anonymous]

What steps will reproduce the problem?
It happened right after I downloaded OSM data, I do not know if it is reproducible.

What is the expected result?
No error message.

What happens instead?
I get the following error message with a message saying I should report it. Everything worked fine once I closed the error message, so there doesn't seem to be anything fatal.

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-07-10 01:34:22
Last Changed Author: stoecker
Revision: 6060
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-07-08 22:13:24 +0200 (Mon, 08 Jul 2013)
Last Changed Rev: 6060

Identification: JOSM/1.5 (6060 de) Mac OS X 10.8.4
Memory Usage: 345 MB / 1056 MB (18 MB allocated, but free)
Java version: 1.7.0_25, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Djava.security.policy=file:/Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/lib/security/javaws.policy, -DtrustProxy=true, -Xverify:remote, -Djnlpx.home=/Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/bin, -Djnlpx.origFilenameArg=/Applications/josm.jnlp, -Djnlpx.remove=true, -Dsun.awt.warmup=true, -Xbootclasspath/a:/Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/lib/javaws.jar:/Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/lib/deploy.jar:/Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/lib/plugin.jar, -Dmacosx.jnlpx.dock.name=JOSM, -Dmacosx.jnlpx.dock.icon=/Users/pck/Library/Application Support/Oracle/Java/Deployment/cache/6.0/34/4be781a2-28cfb77f.icns, -Djnlpx.jvm="/Library/Internet Plug-ins/JavaAppletPlugin.plugin/Contents/Home/bin/java"]
Dataset consistency test: No problems found


java.lang.IllegalArgumentException: null source
	at java.util.EventObject.<init>(EventObject.java:56)
	at java.awt.AWTEvent.<init>(AWTEvent.java:337)
	at java.awt.event.ComponentEvent.<init>(ComponentEvent.java:119)
	at java.awt.event.WindowEvent.<init>(WindowEvent.java:203)
	at java.awt.event.WindowEvent.<init>(WindowEvent.java:248)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:711)
	at java.awt.Component.dispatchEventImpl(Component.java:4731)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Window.dispatchEventImpl(Window.java:2719)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:694)
	at java.awt.EventQueue$3.run(EventQueue.java:692)
	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:708)
	at java.awt.EventQueue$4.run(EventQueue.java:706)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

[Don-vip]

Java bug, no JOSM code involved.
Should be fixed in Java 8 with the closure of ​6907382.