id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
4159	NPE when deleting a data layer	Daeron	team	"I got a NPE when I deleted a data-layer. I also had one WMS-layer.

{{{
Build-Date: 2009-12-13 00:20:01		
Revision: 2623
Is-Local-Build: true

Memory Usage: 442 MB / 910 MB (137 MB allocated, but free)
Java version: 1.6.0_17


Plugins: PicLayer,lakewalker,measurement,validator,wmsplugin
Plugin PicLayer Version: 19062
Plugin lakewalker Version: 18962
Plugin measurement Version: 19058
Plugin validator Version: 19072
Plugin wmsplugin Version: 18953

java.lang.NullPointerException
	at org.openstreetmap.josm.data.osm.event.DatasetEventManager.activeLayerChange(DatasetEventManager.java:71)
	at org.openstreetmap.josm.gui.MapView.fireActiveLayerChanged(MapView.java:107)
	at org.openstreetmap.josm.gui.MapView.removeLayer(MapView.java:327)
	at org.openstreetmap.josm.Main.removeLayer(Main.java:188)
	at org.openstreetmap.josm.gui.dialogs.LayerListDialog$DeleteLayerAction.actionPerformed(LayerListDialog.java:313)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
	at javax.swing.AbstractButton$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:6263)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3255)
	at java.awt.Component.processEvent(Component.java:6028)
	at java.awt.Container.processEvent(Container.java:2041)
	at java.awt.Component.dispatchEventImpl(Component.java:4630)
	at java.awt.Container.dispatchEventImpl(Container.java:2099)
	at java.awt.Component.dispatchEvent(Component.java:4460)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
	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:2475)
	at java.awt.Component.dispatchEvent(Component.java:4460)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
	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	latest	fixed