Problémes avec JTree

Salut a tous
Voila je suis entrains de développez une arbre avec les Jtree
J'ai ajouter deux événements ajouter un nœud et supprimer un nœud
Quand je l'exécute ça me donne des exceptions

Code:

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	public void mousePressed(MouseEvent e) {
		// TODO Auto-generated method stub
		if(e.getSource().equals(MenuA)){
		temptree.add(new DefaultMutableTreeNode("test"));
 
		((DefaultTreeModel)tree.getModel()).reload(parent);
		}
		if(e.getSource().equals(MenuS)){
			parent.remove(temptree);
		((DefaultTreeModel)tree.getModel()).reload(parent);
		}
	}

Voici les exceptions

Code:

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Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
	at AppletImage.valueChanged(AppletImage.java:313)
	at javax.swing.JTree.fireValueChanged(JTree.java:2823)
	at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:3194)
	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
	at javax.swing.tree.DefaultTreeSelectionModel.clearSelection(DefaultTreeSelectionModel.java:570)
	at javax.swing.tree.VariableHeightLayoutCache.rebuild(VariableHeightLayoutCache.java:740)
	at javax.swing.tree.VariableHeightLayoutCache.treeStructureChanged(VariableHeightLayoutCache.java:626)
	at javax.swing.plaf.basic.BasicTreeUI$Handler.treeStructureChanged(BasicTreeUI.java:3829)
	at javax.swing.tree.DefaultTreeModel.fireTreeStructureChanged(DefaultTreeModel.java:561)
	at javax.swing.tree.DefaultTreeModel.reload(DefaultTreeModel.java:279)
	at AppletImage.mousePressed(AppletImage.java:292)
	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:263)
	at java.awt.Component.processMouseEvent(Component.java:6038)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
	at java.awt.Component.processEvent(Component.java:5806)
	at java.awt.Container.processEvent(Container.java:2058)
	at java.awt.Component.dispatchEventImpl(Component.java:4413)
	at java.awt.Container.dispatchEventImpl(Container.java:2116)
	at java.awt.Component.dispatchEvent(Component.java:4243)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3983)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
	at java.awt.Container.dispatchEventImpl(Container.java:2102)
	at java.awt.Window.dispatchEventImpl(Window.java:2440)
	at java.awt.Component.dispatchEvent(Component.java:4243)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)