id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
8750	error after deleting layer	didier2020	team	"What steps will reproduce the problem?
 1. work with josm
 2. delete layer


What is the expected result?
no layer 

What happens instead?
popup with error

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

{{{
Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-05-08 01:34:29
Last Changed Author: stoecker
Revision: 5939
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-05-07 14:05:08 +0200 (Tue, 07 May 2013)
Last Changed Rev: 5939

Identification: JOSM/1.5 (5939 fr) Linux Debian GNU/Linux 6.0.7 (squeeze)
Memory Usage: 1131 MB / 1820 MB (214 MB allocated, but free)
Java version: 1.6.0_26, Sun Microsystems Inc., Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Xmx2048M]

Plugin: cadastre-fr (29526)
Plugin: geotools (29435)
Plugin: jts (29435)
Plugin: poly (29435)
Plugin: proj4j (29435)
Plugin: tag2link (29461)
Plugin: todo (29155)
Plugin: utilsplugin2 (29435)
Plugin: wikipedia (29523)

java.lang.NullPointerException
	at org.openstreetmap.josm.gui.dialogs.ValidatorDialog$SelectionWatch.valueChanged(ValidatorDialog.java:501)
	at javax.swing.JTree.fireValueChanged(JTree.java:2820)
	at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:3191)
	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
	at javax.swing.tree.DefaultTreeSelectionModel.clearSelection(DefaultTreeSelectionModel.java:570)
	at javax.swing.tree.VariableHeightLayoutCache.rebuild(VariableHeightLayoutCache.java:740)
	at javax.swing.tree.VariableHeightLayoutCache.treeStructureChanged(VariableHeightLayoutCache.java:626)
	at javax.swing.plaf.basic.BasicTreeUI$Handler.treeStructureChanged(BasicTreeUI.java:3824)
	at javax.swing.tree.DefaultTreeModel.fireTreeStructureChanged(DefaultTreeModel.java:561)
	at javax.swing.tree.DefaultTreeModel.nodeStructureChanged(DefaultTreeModel.java:347)
	at javax.swing.tree.DefaultTreeModel.setRoot(DefaultTreeModel.java:117)
	at org.openstreetmap.josm.gui.dialogs.validator.ValidatorTreePanel.buildTree(ValidatorTreePanel.java:130)
	at org.openstreetmap.josm.gui.dialogs.validator.ValidatorTreePanel.setErrorList(ValidatorTreePanel.java:287)
	at org.openstreetmap.josm.gui.dialogs.ValidatorDialog.layerRemoved(ValidatorDialog.java:444)
	at org.openstreetmap.josm.gui.MapView.fireLayerRemoved(MapView.java:176)
	at org.openstreetmap.josm.gui.MapView.removeLayer(MapView.java:414)
	at org.openstreetmap.josm.Main.removeLayer(Main.java:296)
	at org.openstreetmap.josm.gui.dialogs.LayerListDialog$DeleteLayerAction.actionPerformed(LayerListDialog.java:397)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
	at java.awt.Component.processMouseEvent(Component.java:6288)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
	at java.awt.Component.processEvent(Component.java:6053)
	at java.awt.Container.processEvent(Container.java:2041)
	at java.awt.Component.dispatchEventImpl(Component.java:4651)
	at java.awt.Container.dispatchEventImpl(Container.java:2099)
	at java.awt.Component.dispatchEvent(Component.java:4481)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
	at java.awt.Container.dispatchEventImpl(Container.java:2085)
	at java.awt.Window.dispatchEventImpl(Window.java:2478)
	at java.awt.Component.dispatchEvent(Component.java:4481)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643)
	at java.awt.EventQueue.access$000(EventQueue.java:84)
	at java.awt.EventQueue$1.run(EventQueue.java:602)
	at java.awt.EventQueue$1.run(EventQueue.java:600)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
	at java.awt.EventQueue$2.run(EventQueue.java:616)
	at java.awt.EventQueue$2.run(EventQueue.java:614)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:613)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

}}}
"	defect	closed	normal		Core	tested	fixed	template_report