id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
8712	"""Comparison method violates its general contract"" when sorting a collection in Java 7"	mdk	team	"Simply open the attached file and start Validator. After validation (when moving the mouse ?) these error occurs.

First I found it in Revision 5950, but it is also in the latest version 5958:
{{{
Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-05-13 01:34:36
Last Changed Author: Don-vip
Revision: 5958
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-05-13 03:10:05 +0200 (Mon, 13 May 2013)
Last Changed Rev: 5958

Identification: JOSM/1.5 (5958 en) Linux Ubuntu 12.10
Memory Usage: 347 MB / 876 MB (79 MB allocated, but free)
Java version: 1.7.0_21, Oracle Corporation, OpenJDK Server VM
VM arguments: [-Djosm.home=/home/michael/.josm-latest, -Djava.net.useSystemProxies=true]
Dataset consistency test: No problems found

Plugin: ColumbusCSV (29500)
Plugin: FastDraw (29532)
Plugin: HouseNumberTaggingTool (29487)
Plugin: OpeningHoursEditor (29435)
Plugin: RoadSigns (29435)
Plugin: SimplifyArea (29435)
Plugin: buildings_tools (29435)
Plugin: contourmerge (1003)
Plugin: imagery_offset_db (29467)
Plugin: multipoly-convert (29435)
Plugin: poly (29435)
Plugin: public_transport (29435)
Plugin: reltoolbox (29535)
Plugin: reverter (29561)
Plugin: terracer (29509)
Plugin: turnrestrictions (29435)
Plugin: utilsplugin2 (29435)

java.lang.IllegalArgumentException: Comparison method violates its general contract!
	at java.util.TimSort.mergeLo(TimSort.java:747)
	at java.util.TimSort.mergeAt(TimSort.java:483)
	at java.util.TimSort.mergeCollapse(TimSort.java:410)
	at java.util.TimSort.sort(TimSort.java:214)
	at java.util.TimSort.sort(TimSort.java:173)
	at java.util.Arrays.sort(Arrays.java:659)
	at java.util.Collections.sort(Collections.java:217)
	at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(SortingFocusTraversalPolicy.java:136)
	at javax.swing.SortingFocusTraversalPolicy.getFocusTraversalCycle(SortingFocusTraversalPolicy.java:110)
	at javax.swing.SortingFocusTraversalPolicy.getComponentAfter(SortingFocusTraversalPolicy.java:280)
	at javax.swing.LayoutFocusTraversalPolicy.getComponentAfter(LayoutFocusTraversalPolicy.java:106)
	at java.awt.Component.getNextFocusCandidate(Component.java:7860)
	at java.awt.Component.transferFocus(Component.java:7828)
	at java.awt.Component.hide(Component.java:1684)
	at java.awt.Component.show(Component.java:1653)
	at java.awt.Component.setVisible(Component.java:1603)
	at javax.swing.JComponent.setVisible(JComponent.java:2631)
	at org.openstreetmap.josm.gui.dialogs.ToggleDialog.eventDispatched(ToggleDialog.java:875)
	at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2434)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2326)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2325)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2325)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2325)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2325)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2325)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2325)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2325)
	at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2284)
	at java.awt.Component.dispatchEventImpl(Component.java:4757)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4505)
	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:4687)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:688)
	at java.awt.EventQueue$3.run(EventQueue.java:686)
	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:702)
	at java.awt.EventQueue$4.run(EventQueue.java:700)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
	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)
}}}
"	defect	closed	normal		Core	latest	fixed	java7, java8	stoecker