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I added a subitem to the tasklist (3 were already in there), I right mouse clicked on it, the item disappeared and a dialog popped up telling about the exception, I did it again the same thing happend (and older item disappeared), after that I left mouse clicked and selected an item and after that I couldn't replicate it anymore: From ide.log: ------------------------------------------------------------------------------- >Log Session: Monday, August 9, 2004 9:40:31 AM CEST >System Info: Product Version = NetBeans IDE 3.6 (Build 200404071636) Operating System = Linux version 2.6.7-gentoo-r12 running on amd64 Java; VM; Vendor = 1.5.0-beta2; Java HotSpot(TM) 64-Bit Server VM 1.5.0-beta2-b51; Sun Microsystems Inc. Java Home = /opt/jdk1.5.0/jre System Locale; Encod. = en_US; ANSI_X3.4-1968 Home Dir; Current Dir = /home/helios; /home/helios IDE Install; User Dir = /opt/netbeans-3.6; /home/helios/.netbeans/3.6 CLASSPATH = /opt/netbeans-3.6/lib/ext/boot.jar:/opt/jdk1.5.0//lib/dt.jar:/opt/jdk1.5.0//lib/jconsole.jar:/opt/jdk1.5.0//lib/sa-jdi.jar:/opt/jdk1.5.0//lib/tools.jar Boot & ext classpath = /opt/jdk1.5.0/jre/lib/rt.jar:/opt/jdk1.5.0/jre/lib/i18n.jar:/opt/jdk1.5.0/jre/lib/sunrsasign.jar:/opt/jdk1.5.0/jre/lib/jsse.jar:/opt/jdk1.5.0/jre/lib/jce.jar:/opt/jdk1.5.0/jre/lib/charsets.jar:/opt/jdk1.5.0/jre/classes:/opt/jdk1.5.0/jre/lib/ext/dnsns.jar:/opt/jdk1.5.0/jre/lib/ext/sunjce_provider.jar:/opt/jdk1.5.0/jre/lib/ext/localedata.jar Dynamic classpath = /opt/netbeans-3.6/lib/openide.jar:/opt/netbeans-3.6/lib/core.jar:/opt/netbeans-3.6/lib/openfile-cli.jar:/opt/netbeans-3.6/lib/openide-loaders.jar ------------------------------------------------------------------------------- [org.netbeans.core.modules #4] Warning - had to upgrade dependencies for module com.xpdev.refactory: added = [module org.openide.src > 1.0, module org.openide.debugger > 1.0, token org.openide.compiler.CompilationEngine, module org.openide.compiler > 1.0, token org.openide.TopManager, module org.openide.execution > 1.0, token org.openide.windows.IOProvider, module org.openide.deprecated > 1.0, token org.openide.execution.ExecutionEngine, module org.openide.io > 1.0] removed = []; details: [API separation phase I (#19443): http://www.netbeans.org/download/dev/javadoc/OpenAPIs/org/openide/doc-files/upgrade.html#3.5i-sep-I, API separation phase II (#19443): http://www.netbeans.org/download/dev/javadoc/OpenAPIs/org/openide/doc-files/upgrade.html#3.5i-sep-II, Debugger API separation (#29914): http://www.netbeans.org/download/dev/javadoc/OpenAPIs/org/openide/doc-files/upgrade.html#3.5i-sep-III] [org.netbeans.core.modules #6] Warning: the module org.netbeans.modules.projects uses org.openide.deprecated which is deprecated: Clients of obsoleted Open APIs are encouraged to remove this dependency. See http://www.netbeans.org/download/dev/javadoc/OpenAPIs/org/openide/doc-files/upgrade.html#3.5i-sep-I [org.netbeans.core.modules #6] Warning: the module com.xpdev.refactory uses org.openide.deprecated which is deprecated: Clients of obsoleted Open APIs are encouraged to remove this dependency. See http://www.netbeans.org/download/dev/javadoc/OpenAPIs/org/openide/doc-files/upgrade.html#3.5i-sep-I Turning on modules: org.openide/1 [4.26.1 200404071636] org.netbeans.lib.cvsclient/1 [1.8.1 200404071636] org.openide.src [1.1.1 200404071636] org.openide.io [1.1.1 200404071636] org.openide.execution [1.1.1 200404071636] org.openide.compiler [1.2.1 200404071636] org.openide.loaders [4.11.1 200404071636] org.netbeans.core/1 [1.21.1 200404071636] org.netbeans.lib.terminalemulator [1.1.1 200404071636] org.netbeans.core.output/1 [1.1.1 200404071636] org.netbeans.core.compiler/1 [1.4.1 200404071636] org.openide.debugger [1.1.1 200404071636] org.netbeans.modules.j2eeapis/1 [1.0.1 200404071636] org.netbeans.modules.settings/1 [1.4.1 200404071636] org.netbeans.libs.xalan/1 [1.4.1 2.5.2] org.netbeans.libs.jaxp/1 [1.2.1 1.1.2] org.netbeans.api.xml/1 [1.3.1.3.6.0 3.6.0 200404071636] org.netbeans.modules.javahelp/1 [2.1.1 200404071636] org.netbeans.modules.schema2beans/1 [1.7.1 200404071636] org.netbeans.core.execution/1 [1.3.1 200404071636] org.netbeans.modules.debugger.core/3 [2.10.1 200404071636] org.netbeans.api.java/1 [1.3.1 200404071636] org.netbeans.libs.j2eeeditor/1 [1.1.1 200404071636] org.netbeans.modules.j2eeserver/3 [1.1.1 200404071636] org.netbeans.modules.debugger.jpda/1 [1.17.1 200404071636] org.netbeans.api.web.dd/1 [1.1.1 1.0 200404071636] org.netbeans.libs.xerces/1 [1.4.1 2.6.0] org.netbeans.modules.tomcat5/1 [1.0.1 200404071636] org.netbeans.modules.classfile/1 [1.8 200404071636] org.netbeans.modules.java/1 [1.16.1 200404071636] org.netbeans.tasklistapi/1 [1.7.1.2 2 200404071636] org.netbeans.modules.tasklist.core/2 [1.22.1.26 6 200404071636] org.netbeans.modules.suggestions_framework/2 [1.2.1.265 5 200404071636] org.netbeans.modules.junit/2 [2.11.1 200404071636] org.netbeans.core.windows/2 [2.0.1 200404071636] org.netbeans.modules.xml.core/2 [1.1.1.3.6.0 3.6.0 200404071636] org.netbeans.modules.servletapi24/1 [2.0.1 2.0.1 200404071636] org.apache.tools.ant.module/3 [3.6.1 200404071636] org.netbeans.modules.web.jspparser/2 [2.0.1 200404071636] org.openide.deprecated [1.3.1 200404071636] org.netbeans.core.deprecated [1.3.1 200404071636] org.netbeans.modules.projects/1 [1.14.1 200404071636] org.netbeans.modules.xml.catalog/2 [1.1.1.3.6.0 3.6.0 200404071636] org.netbeans.modules.jarpackager/2 [1.14.1 200404071636] org.netbeans.modules.editor/1 [1.14.1 200404071636] org.netbeans.modules.xml.text/2 [1.1.1.3.6.0 3.6.0 200404071636] org.netbeans.modules.html/1 [1.12.1 200404071636] org.netbeans.modules.web.core.syntax/1 [1.13.1 200404071636] org.netbeans.modules.web.core/1 [1.17.1 200404071636] org.netbeans.modules.web.debug/1 [2.0.1 200404071636] org.netbeans.modules.extbrowser/1 [1.3.1 200404071636] org.netbeans.modules.tasklist.javaparser/2 [1.3.263 3 dev] org.netbeans.modules.treefs/2 [1.27 ${buildnumber}] org.netbeans.modules.servletapi/1 [1.3.1 200404071636] org.netbeans.modules.httpserver/1 [1.13.1 200404071636] org.netbeans.modules.xsl/1 [1.1.1.3.6.0 3.6.0 200404071636] org.netbeans.modules.diff/1 [1.7.1 200404071636] org.openidex.util/2 [2.7.1 200404071636] org.netbeans.modules.vcscore/1 [1.9.1 200404071636] org.netbeans.modules.vcs.advanced/1 [1.9.1 200404071636] org.netbeans.modules.vcs.profiles.cvsprofiles/1 [1.3.1 200404071636] org.netbeans.modules.utilities/1 [1.15.1 200404071636] org.netbeans.modules.tomcat5.bundled/1 [1.0.1 200404071636] org.netbeans.modules.tasklist.usertasks/2 [1.14.268 8 dev] org.netbeans.modules.css/2 [1.1.1.3.6.0 3.6.0 200404071636] org.netbeans.core.ui/1 [1.3.1 200404071636] org.netbeans.modules.beans/1 [1.11.1 200404071636] org.netbeans.modules.xml.schema/1 [1.1.1.3.6.0 3.6.0 200404071636] org.netbeans.modules.web.monitor/1 [1.9.1 200404071636] org.netbeans.modules.db/1 [1.8.1 200404071636] org.netbeans.modules.properties/1 [1.11.1 200404071636] org.netbeans.modules.properties.syntax/1 [1.11 200404071636] org.netbeans.modules.tasklist.docscan/2 [1.13.1.2653 3 200404071636] org.netbeans.modules.vcs.profiles.pvcs/1 [1.3.1 200404071636] org.netbeans.modules.xml.tax/2 [1.1.1.3.6.0 3.6.0 200404071636] org.netbeans.modules.autoupdate/1 [2.8.1 200404071636] org.netbeans.modules.updatecenters/1 [1.0.1 200404071636] org.netbeans.modules.clazz/1 [1.13.1 200404071636] org.netbeans.modules.web.taglibed/1 [1.13.1.3.6.0 200404071636] org.netbeans.modules.i18n/1 [1.14.1 200404071636] org.netbeans.modules.form/2 [1.13.1 200404071636] org.netbeans.modules.i18n.form/2 [1.12 200404071636] org.netbeans.modules.text/1 [1.12.1 200404071636] org.netbeans.modules.web.ie/1 [1.16.1 200404071636] org.netbeans.modules.cvsclient/1 [2.0.1 200404071636] org.netbeans.modules.javadoc/1 [1.11.1 200404071636] org.netbeans.modules.usersguide/1 [1.13.1 200404071636] org.netbeans.core.ide/1 [1.3.1 200404071636] org.netbeans.modules.welcome/1 [1.5.1 200404071636] org.netbeans.modules.xml.tools/2 [1.1.1.3.6.0 3.6.0 200404071636] org.netbeans.modules.tasklist.javadoc/2 [1.6.261 1 040308] com.xpdev.refactory [2.0.7 200408061628] org.netbeans.modules.vcs.profiles.vss/1 [1.3.1 200404071636] org.netbeans.modules.image/1 [1.11.1 200404071636] org.netbeans.modules.tasklist.bugs/2 [0.11.1.261 1 animuk20040316] org.netbeans.modules.tasklist.html/2 [1.6.1.261 1 animuk20040316] org.netbeans.modules.applet/1 [1.14.1 200404071636] org.netbeans.modules.group/1 [1.0.1 200404071636] org.netbeans.modules.vcs.cmdline.compat/1 [1.3.1 200404071636] *********** Exception occurred ************ at Mon Aug 09 10:02:00 CEST 2004 java.lang.IndexOutOfBoundsException: Index: 11, Size: 11 at java.util.ArrayList.RangeCheck(ArrayList.java:547) at java.util.ArrayList.get(ArrayList.java:322) at org.netbeans.modules.tasklist.core.TaskList.fireRemoved(TaskList.java:275) at org.netbeans.modules.tasklist.usertasks.UserTaskList.fireRemoved(UserTaskList.java:644) at org.netbeans.modules.tasklist.core.Task.fireRemovedTask(Task.java:213) at org.netbeans.modules.tasklist.core.Task.removeSubtask(Task.java:424) at org.netbeans.modules.tasklist.core.TaskNode.destroy(TaskNode.java:183) at org.netbeans.modules.tasklist.core.TaskNode.clipboardCut(TaskNode.java:241) at org.openide.explorer.ExplorerActionsImpl$CopyCutActionPerformer.getTransferableOwner(ExplorerActionsImpl.java:462) at org.openide.explorer.ExplorerActionsImpl$CopyCutActionPerformer.performAction(ExplorerActionsImpl.java:451) at org.openide.explorer.ExplorerActionsImpl$CopyCutActionPerformer.actionPerformed(ExplorerActionsImpl.java:473) at org.openide.util.actions.CallbackSystemAction$2.run(CallbackSystemAction.java:438) at org.openide.util.actions.CallableSystemAction.doPerformAction(CallableSystemAction.java:116) at org.openide.util.actions.CallbackSystemAction$DelegateAction.actionPerformed(CallbackSystemAction.java:441) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2167) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258) at javax.swing.AbstractButton.doClick(AbstractButton.java:302) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1000) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.menuDragMouseReleased(BasicMenuItemUI.java:1104) at javax.swing.JMenuItem.fireMenuDragMouseReleased(JMenuItem.java:578) at javax.swing.JMenuItem.processMenuDragMouseEvent(JMenuItem.java:475) at javax.swing.JMenuItem.processMouseEvent(JMenuItem.java:422) at javax.swing.MenuSelectionManager.processMouseEvent(MenuSelectionManager.java:283) at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.eventDispatched(BasicPopupMenuUI.java:757) at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2203) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2097) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2096) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2096) at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2055) at java.awt.Component.dispatchEventImpl(Component.java:3845) at java.awt.Container.dispatchEventImpl(Container.java:2019) at java.awt.Component.dispatchEvent(Component.java:3781) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4205) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3885) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3815) at java.awt.Container.dispatchEventImpl(Container.java:2005) at java.awt.Window.dispatchEventImpl(Window.java:1764) at java.awt.Component.dispatchEvent(Component.java:3781) at java.awt.EventQueue.dispatchEvent(EventQueue.java:463) [catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110) *********** Exception occurred ************ at Mon Aug 09 10:02:01 CEST 2004 java.lang.IndexOutOfBoundsException: Index: 9, Size: 9 at java.util.ArrayList.RangeCheck(ArrayList.java:547) at java.util.ArrayList.get(ArrayList.java:322) at org.netbeans.modules.tasklist.core.TaskList.fireRemoved(TaskList.java:275) at org.netbeans.modules.tasklist.usertasks.UserTaskList.fireRemoved(UserTaskList.java:644) at org.netbeans.modules.tasklist.core.Task.fireRemovedTask(Task.java:213) at org.netbeans.modules.tasklist.core.Task.removeSubtask(Task.java:424) at org.netbeans.modules.tasklist.core.TaskNode.destroy(TaskNode.java:183) at org.netbeans.modules.tasklist.core.TaskNode.clipboardCut(TaskNode.java:241) at org.openide.explorer.ExplorerActionsImpl$CopyCutActionPerformer.getTransferableOwner(ExplorerActionsImpl.java:462) at org.openide.explorer.ExplorerActionsImpl$CopyCutActionPerformer.performAction(ExplorerActionsImpl.java:451) at org.openide.explorer.ExplorerActionsImpl$CopyCutActionPerformer.actionPerformed(ExplorerActionsImpl.java:473) at org.openide.util.actions.CallbackSystemAction$2.run(CallbackSystemAction.java:438) at org.openide.util.actions.CallableSystemAction.doPerformAction(CallableSystemAction.java:116) at org.openide.util.actions.CallbackSystemAction$DelegateAction.actionPerformed(CallbackSystemAction.java:441) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2167) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258) at javax.swing.AbstractButton.doClick(AbstractButton.java:302) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1000) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.menuDragMouseReleased(BasicMenuItemUI.java:1104) at javax.swing.JMenuItem.fireMenuDragMouseReleased(JMenuItem.java:578) at javax.swing.JMenuItem.processMenuDragMouseEvent(JMenuItem.java:475) at javax.swing.JMenuItem.processMouseEvent(JMenuItem.java:422) at javax.swing.MenuSelectionManager.processMouseEvent(MenuSelectionManager.java:283) at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.eventDispatched(BasicPopupMenuUI.java:757) at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2203) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2097) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2096) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2096) at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2055) at java.awt.Component.dispatchEventImpl(Component.java:3845) at java.awt.Container.dispatchEventImpl(Container.java:2019) at java.awt.Component.dispatchEvent(Component.java:3781) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4205) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3885) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3815) at java.awt.Container.dispatchEventImpl(Container.java:2005) at java.awt.Window.dispatchEventImpl(Window.java:1764) at java.awt.Component.dispatchEvent(Component.java:3781) at java.awt.EventQueue.dispatchEvent(EventQueue.java:463) [catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110) java.lang.IllegalStateException: This must happen in the event thread! at org.openide.awt.Actions$Bridge.propertyChange(Actions.java:341) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270) at org.openide.util.SharedClassObject.firePropertyChange(SharedClassObject.java:386) at org.openide.util.SharedClassObject.putProperty(SharedClassObject.java:276) at org.openide.util.actions.SystemAction.setEnabled(SystemAction.java:101) at org.openide.util.actions.CallbackSystemAction.updateEnabled(CallbackSystemAction.java:126) at org.openide.util.actions.CallbackSystemAction.access$200(CallbackSystemAction.java:53) at org.openide.util.actions.CallbackSystemAction$ActionDelegateListener.propertyChange(CallbackSystemAction.java:386) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270) at javax.swing.AbstractAction.firePropertyChange(AbstractAction.java:178) at javax.swing.AbstractAction.setEnabled(AbstractAction.java:138) at org.openide.explorer.ExplorerActionsImpl$OwnPaste.setPasteTypes(ExplorerActionsImpl.java:405) at org.openide.explorer.ExplorerActionsImpl.updatePasteTypes(ExplorerActionsImpl.java:292) at org.openide.explorer.ExplorerActionsImpl.updatePasteAction(ExplorerActionsImpl.java:280) at org.openide.explorer.ExplorerActionsImpl.access$300(ExplorerActionsImpl.java:48) at org.openide.explorer.ExplorerActionsImpl$ActionStateUpdater.clipboardChanged(ExplorerActionsImpl.java:619) at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:582) at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:383) at $Proxy8.clipboardChanged(Unknown Source) at org.openide.util.datatransfer.ExClipboard.fireClipboardChange(ExClipboard.java:60) at org.netbeans.core.NbClipboard.run(NbClipboard.java:149) at org.openide.util.Task.run(Task.java:136) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:330) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:686) java.lang.IllegalStateException: This must happen in the event thread! at org.openide.awt.Actions$Bridge.propertyChange(Actions.java:341) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270) at org.openide.util.SharedClassObject.firePropertyChange(SharedClassObject.java:386) at org.openide.util.SharedClassObject.putProperty(SharedClassObject.java:276) at org.openide.util.actions.SystemAction.setEnabled(SystemAction.java:101) at org.openide.util.actions.CallbackSystemAction.updateEnabled(CallbackSystemAction.java:126) at org.openide.util.actions.CallbackSystemAction.access$200(CallbackSystemAction.java:53) at org.openide.util.actions.CallbackSystemAction$ActionDelegateListener.propertyChange(CallbackSystemAction.java:386) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270) at javax.swing.AbstractAction.firePropertyChange(AbstractAction.java:178) at javax.swing.AbstractAction.setEnabled(AbstractAction.java:138) at org.openide.explorer.ExplorerActionsImpl$OwnPaste.setPasteTypes(ExplorerActionsImpl.java:405) at org.openide.explorer.ExplorerActionsImpl.updatePasteTypes(ExplorerActionsImpl.java:341) at org.openide.explorer.ExplorerActionsImpl.updatePasteAction(ExplorerActionsImpl.java:280) at org.openide.explorer.ExplorerActionsImpl.access$300(ExplorerActionsImpl.java:48) at org.openide.explorer.ExplorerActionsImpl$ActionStateUpdater.clipboardChanged(ExplorerActionsImpl.java:619) at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:582) at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:383) at $Proxy8.clipboardChanged(Unknown Source) at org.openide.util.datatransfer.ExClipboard.fireClipboardChange(ExClipboard.java:60) at org.netbeans.core.NbClipboard.run(NbClipboard.java:149) at org.openide.util.Task.run(Task.java:136) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:330) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:686) Warning: use of system property netbeans.debug.exceptions in org.netbeans.modules.xml.text.syntax.javacc.DTDSyntaxTokenManager has been obsoleted in favor of ErrorManager
*** This issue has been marked as a duplicate of 41883 ***
Now I spotted that exception goes from ArrayList that is removed in the issue #41883 patch. I looks like IDE reports another module version than is actually use. Try to delete modules/tasklits-core.jar and system/Modules/org-netbeans-mosules-tasklist-core.xml from your user dir an update again. Then please attach results to issue #41883. Preferably closing it as resolved, verified :-).