Exception on deleting a way with 0 points

[Pepou]

What steps will reproduce the problem?

1. I've got a 3-fold building, consisting of I think 5 or 6 points. With Validation window the error subtree listed 3 "duplicated" ways exactly one over another.
2. I've selected it and pressed the "Selection" button. The 3 ways were displayed in the "Sel.: ..." window.
3. I've selected the first of the ways and pressed the "Selection" button, only this way remained in the "Sel.: ..." window.
4. Then I've pressed the Delete button.
5. I think I've repeated this again (from point 2.) - one of the displayed ways had just 0 (zero) points.
6. Finally I've again selected the same way (with 0 points). After pressing the Delete button the JOSM threw an exception. But remained functional (or at least seems to be.)

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2011-07-11 01:31:35
Last Changed Author: stoecker
Revision: 4223
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2011-07-10 22:46:41 +0200 (Sun, 10 Jul 2011)
Last Changed Rev: 4223

Identification: JOSM/1.5 (4223 sk)
Memory Usage: 220 MB / 455 MB (81 MB allocated, but free)
Java version: 1.6.0_25, Sun Microsystems Inc., Java HotSpot(TM) 64-Bit Server VM
Operating system: Windows 7
Dataset consistency test: No problems found

Plugin: DirectDownload (26174)
Plugin: ElevationProfile (26174)
Plugin: OpeningHoursEditor (26284)
Plugin: buildings_tools (26254)
Plugin: openstreetbugs (26299)
Plugin: turnlanes (26316)
Plugin: turnrestrictions (26299)

java.lang.IllegalArgumentException: {Way id=123066507 version=1 MVDT nodes=[]} is already deleted
	at org.openstreetmap.josm.command.DeleteCommand.executeCommand(DeleteCommand.java:117)
	at org.openstreetmap.josm.command.SequenceCommand.executeCommand(SequenceCommand.java:53)
	at org.openstreetmap.josm.data.UndoRedoHandler.addNoRedraw(UndoRedoHandler.java:36)
	at org.openstreetmap.josm.data.UndoRedoHandler.add(UndoRedoHandler.java:58)
	at org.openstreetmap.josm.actions.mapmode.DeleteAction.doActionPerformed(DeleteAction.java:142)
	at org.openstreetmap.josm.actions.DeleteAction.actionPerformed(DeleteAction.java:28)
	at javax.swing.SwingUtilities.notifyAction(Unknown Source)
	at javax.swing.JComponent.processKeyBinding(Unknown Source)
	at javax.swing.KeyboardManager.fireBinding(Unknown Source)
	at javax.swing.KeyboardManager.fireKeyboardAction(Unknown Source)
	at javax.swing.JComponent.processKeyBindingsForAllComponents(Unknown Source)
	at javax.swing.JComponent.processKeyBindings(Unknown Source)
	at javax.swing.JComponent.processKeyEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$000(Unknown Source)
	at java.awt.EventQueue$1.run(Unknown Source)
	at java.awt.EventQueue$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$2.run(Unknown Source)
	at java.awt.EventQueue$2.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

[bastiK]

It should not be possible to create a way with 0 nodes. If you can reproduce the problem, please attach the *.osm and give a more concrete instructions. Otherwise this will be hard to fix.

[skyper]

Replying to bastiK:

It should not be possible to create a way with 0 nodes. If you can reproduce the problem, please attach the *.osm and give a more concrete instructions. Otherwise this will be hard to fix.

If you use the selection history or validator, it is easy to select already deleted objects.

I can reproduce two errors:

1. If you merge all the middle nodes on the west side onto the north-west edge node of example.osm, you get example2.osm, a square, closed way containing six nodes.
2. Just select a way, delete it and select it with the selection history -> way with 0 nodes. Delete it -> exception.

[skyper]

example

[skyper]

example2

[Pepou]

Replying to skyper:

Replying to bastiK:

It should not be possible to create a way with 0 nodes. If you can reproduce the problem, ...

If you use the selection history or validator, it is easy to select already deleted objects.

Exactly.

Another example:

1. Create 2 short ways with two endpoints, placed one over another like X. Tag them e.g. building=garages.
2. Select them and launch Validation - "Overlapping buildings, 2 ways" will apear in the "Validation results" dialog.
3. Click on the "2 ways" row and press the dialog's "Selecion" button. Both ways will appear in the "Sel.:Rel.:0 / Ways:2 / Points:0" dialog (both "id=0 (2 points)", with "building=garages" in tooltip).
4. Select one of them in the Selection dialog and press the dialog's "Selection" button (just one of the lines will get selected) and delete the line.
5. Again in the "Validation results" dialog, click on the "2 ways" row and press the dialog's "Selecion" button. Both ways will again appear in the "Sel.:Rel.:0 / Ways:2 / Points:0" dialog, both "id=0", with "building=garages" in tooltip, but one of them will have just 0 points.

[skyper]

Ticket #5566 has been marked as a duplicate of this ticket.

[skyper]

Ticket #5528 has been marked as a duplicate of this ticket.