id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
4450	LiveGPS sporadic errors	willis@…	team	"What steps will reproduce the problem?
 1. Connect to GPS receiver with gpsd.
 2. GPS receiver can stay at same position when static navigation is switched off.
 3. Within JOSM load no data, do only the following:
 3.1 LiveGPS / Track.
 3.2 LiveGPS / Center one time
 3.3 Save LiveGPS data under filename test.gpx for the first time and from time to time.
 4. Wait: Sometimes the error occurs for the first time after a few minutes sometimes after more than one hour. Later more frequently, up to each second.
 5. The program continues working before and after klicking ""No action"".

What is the expected result?
What happens instead?
Besides the message window I did not recognize any effect. But it is uncomfortable to work with JOSM especially in the field when you want enter something but have to click away the message every second.

Please provide any additional information below. Attach a screenshot if
possible.
I am using a netbook Samsung N140 with Windows 7 Starter. I recognized the error the first time using JOSM version 2561 after changing the parameter livegps.refreshintervall from default (empty) to 3. It also occurs with version 2894 and livegps.refreshintervall=3 or empty. Screenshot attached.

{{{
Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2010-01-26 02:32:20
Last Changed Author: bastiK
Revision: 2894
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2010-01-25 23:05:57 +0100 (Mon, 25 Jan 2010)
Last Changed Rev: 2894

Memory Usage: 43 MB / 1016 MB (16 MB allocated, but free)
Java version: 1.6.0_17


Plugins: PicLayer,editgpx,livegps,measurement,surveyor,validator,wmsplugin
Plugin wmsplugin Version: 19626
Plugin editgpx Version: 19434
Plugin PicLayer Version: 19467
Plugin validator Version: 19616
Plugin livegps Version: 19448
Plugin measurement Version: 19450
Plugin surveyor Version: 19479

java.util.ConcurrentModificationException
	at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
	at java.util.AbstractList$Itr.next(Unknown Source)
	at org.openstreetmap.josm.data.gpx.GpxTrack.length(GpxTrack.java:21)
	at org.openstreetmap.josm.data.gpx.GpxData.length(GpxData.java:125)
	at org.openstreetmap.josm.gui.layer.GpxLayer.getToolTipText(G"	defect	closed	normal		Core		fixed	template_report