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java.lang.NullPointerException: 	at com.bea.xmleditor.core.xml.XMLDocument.getCharAt(XMLDocument.java:258)	at com.bea.xmleditor.core.xml.XMLDocumentQuotedText.hasQuoteAt(XMLDocumentQuotedText.java:120)	at com.bea.xmleditor.core.xml.XMLDocumentQuotedText.untranslatedText(XMLDocumentQuotedText.java:44)	at com.bea.xmleditor.core.xml.XMLDocumentQuotedText.treeDisplayText(XMLDocumentQuotedText.java:188)	at com.bea.xmleditor.application.ui.XMLTree.convertValueToText(XMLTree.java:198)	at javax.swing.tree.DefaultTreeCellRenderer.getTreeCellRendererComponent(UnknownSource)	at com.bea.xmleditor.application.ui.XMLTree$TreeNodeRenderer.getTreeCellRendererComponent(XMLTree.java:273)	at javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(UnknownSource)	at javax.swing.tree.AbstractLayoutCache.getNodeDimensions(Unknown Source)	at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.updatePreferredSize(UnknownSource)	at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(Unknown Source)	at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(Unknown Source)	at javax.swing.tree.VariableHeightLayoutCache.ensurePathIsExpanded(Unknown Source)	at javax.swing.tree.VariableHeightLayoutCache.setExpandedState(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI.updateExpandedDescendants(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI$TreeExpansionHandler.treeExpanded(UnknownSource)	at javax.swing.JTree.fireTreeExpanded(Unknown Source)	at javax.swing.JTree.setExpandedState(Unknown Source)	at javax.swing.JTree.expandPath(Unknown Source)	at javax.swing.JTree.makeVisible(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI$TreeSelectionHandler.valueChanged(UnknownSource)	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(Unknown Source)	at javax.swing.JTree.setSelectionPath(Unknown Source)	at com.bea.xmleditor.application.ui.XMLTree.selectItem(XMLTree.java:229)	at com.bea.xmleditor.core.xml.XMLDocument.selectItemInTree(XMLDocument.java:1455)	at com.bea.xmleditor.core.xml.XMLDocumentItem.selectInTree(XMLDocumentItem.java:1364)	at com.bea.xmleditor.application.ui.XMLEditPane.mousePressed(XMLEditPane.java:340)	at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)