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java.lang.NullPointerException: 	at java.util.Hashtable.get(Hashtable.java:333)	at java.awt.Component.getFontMetrics(Component.java:2172)	at oracle.jdevimpl.cm.dt.editor.explainPlan.ExplainPlanPane.init(ExplainPlanPane.java:118)	at oracle.jdevimpl.cm.dt.editor.explainPlan.ExplainPlanPane.(ExplainPlanPane.java:42)	at oracle.jdevimpl.cm.dt.editor.sqlview.SqlEditorMainPanel.(SqlEditorMainPanel.java:88)	at oracle.jdevimpl.cm.dt.editor.sqlview.SqlEditor._createGUI(SqlEditor.java:422)	at oracle.jdevimpl.cm.dt.editor.sqlview.SqlEditor.getGUI(SqlEditor.java:282)	at oracle.ideimpl.flateditor.SplitPane.attachFlatEditor(SplitPane.java:605)	at oracle.ideimpl.flateditor.SplitPane.attachCurrentEditor(SplitPane.java:590)	at oracle.ideimpl.flateditor.SplitPane.setCurrentEditorStatePos(SplitPane.java:800)	at oracle.ideimpl.flateditor.SplitPane.setSplitPaneState(SplitPane.java:167)	at oracle.ideimpl.flateditor.TabGroup.attachCurrentDocument(TabGroup.java:441)	at oracle.ideimpl.flateditor.TabGroup.setCurrentTabGroupState(TabGroup.java:1212)	at oracle.ideimpl.flateditor.TabGroup.activateEditor(TabGroup.java:574)	at oracle.ideimpl.flateditor.FlatEditorManager.createEditor(FlatEditorManager.java:1021)	at oracle.ideimpl.flateditor.FlatEditorManager.createEditorInFrame(FlatEditorManager.java:976)	at oracle.ideimpl.flateditor.FlatEditorManager.openEditorInFrame(FlatEditorManager.java:910)	at oracle.jdeveloper.cm.dt.addin.AbstractConnectionEditorWizard.invoke(AbstractConnectionEditorWizard.java:130)	at oracle.ide.cmd.OpenWizardCommand.doit(OpenWizardCommand.java:42)	at oracle.ide.CommandProcessor.invokeImpl(CommandProcessor.java:391)	at oracle.ide.CommandProcessor.invoke(CommandProcessor.java:343)	at oracle.ide.CommandProcessor.invoke(CommandProcessor.java:110)	at oracle.ide.WizardManager.handleEvent(WizardManager.java:399)	at oracle.ide.IdeAction.performAction(IdeAction.java:649)	at oracle.ide.IdeAction$1.run(IdeAction.java:857)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)