Error when drawing a closed loop

[trekki <bergenholtz@…>]

What steps will reproduce the problem?

1. open a new josm session
2. create a empty layer
3. click a triangle of ways
4. last of the 3 ways must connect to the start of the first way

What is the expected result?
a closed way in a triangle form

What happens instead?
crash

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2010-03-11 02:31:32
Last Changed Author: jttt
Revision: 3107
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2010-03-10 19:11:58 +0100 (Wed, 10 Mar 2010)
Last Changed Rev: 3107

Memory Usage: 70 MB / 2730 MB (45 MB allocated, but free)
Java version: 1.6.0_0, Sun Microsystems Inc., OpenJDK 64-Bit Server VM
Operating system: Linux

Dataset consistency test:
No problems found


Plugins: wmsplugin,validator
Plugin wmsplugin Version: 19240
Plugin validator Version: 19229

java.lang.UnsupportedOperationException
	at java.util.Collections$UnmodifiableCollection.clear(Collections.java:1053)
	at org.openstreetmap.josm.actions.mapmode.DrawAction.mouseReleased(DrawAction.java:510)
	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
	at java.awt.Component.processMouseEvent(Component.java:6108)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
	at java.awt.Component.processEvent(Component.java:5873)
	at java.awt.Container.processEvent(Container.java:2105)
	at java.awt.Component.dispatchEventImpl(Component.java:4469)
	at java.awt.Container.dispatchEventImpl(Container.java:2163)
	at java.awt.Component.dispatchEvent(Component.java:4295)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4461)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4125)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4055)
	at java.awt.Container.dispatchEventImpl(Container.java:2149)
	at java.awt.Window.dispatchEventImpl(Window.java:2478)
	at java.awt.Component.dispatchEvent(Component.java:4295)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:604)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)

[urbanrambler1]

I'm experiencing exactly the same. I've just uploaded latest (3107) and editing JOSM for first time.

[bastiK]

Why don't you use tested version then, for latest it says "may have more errors than "tested", be careful with this one".

[anonymous]

Closed as duplicate of #4705.