Hallo ihr,
wenn ich in meinem Baum einen Knoten selektiert habe und daraufhin den Elternknoten zusammenklappe erhalte ich folgende Fehlermeldung:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at of.startfenster$12.valueChanged(startfenster.java:583)
at javax.swing.JTree.fireValueChanged(JTree.java:2820)
at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:3191)
at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1078)
at javax.swing.tree.DefaultTreeSelectionModel.removeSelectionPaths(DefaultTreeSelectionModel.java:497)
at javax.swing.JTree.removeDescendantSelectedPaths(JTree.java:3516)
at javax.swing.JTree.setExpandedState(JTree.java:3404)
at javax.swing.JTree.collapsePath(JTree.java:2188)
at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2215)
at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2191)
at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2149)
at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3511)
at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3459)
at java.awt.Component.processMouseEvent(Component.java:6260)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
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:4235)
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: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)
An besagter Stelle rufe ich folgende Funktion auf:
Wie kann ich denn das umgehen?
mfg
Jens
wenn ich in meinem Baum einen Knoten selektiert habe und daraufhin den Elternknoten zusammenklappe erhalte ich folgende Fehlermeldung:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at of.startfenster$12.valueChanged(startfenster.java:583)
at javax.swing.JTree.fireValueChanged(JTree.java:2820)
at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:3191)
at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1078)
at javax.swing.tree.DefaultTreeSelectionModel.removeSelectionPaths(DefaultTreeSelectionModel.java:497)
at javax.swing.JTree.removeDescendantSelectedPaths(JTree.java:3516)
at javax.swing.JTree.setExpandedState(JTree.java:3404)
at javax.swing.JTree.collapsePath(JTree.java:2188)
at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2215)
at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2191)
at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2149)
at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3511)
at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3459)
at java.awt.Component.processMouseEvent(Component.java:6260)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
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:4235)
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: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)
An besagter Stelle rufe ich folgende Funktion auf:
Java:
String value = e.getNewLeadSelectionPath().getPathComponent(0).toString();
Wie kann ich denn das umgehen?
mfg
Jens