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java.lang.NullPointerException: 	at GroupableTableHeaderUI.getHeaderHeight(GroupableTableHeaderUI.java:87)	at GroupableTableHeaderUI.createHeaderSize(GroupableTableHeaderUI.java:108)	at GroupableTableHeaderUI.getPreferredSize(GroupableTableHeaderUI.java:118)	at javax.swing.JComponent.getPreferredSize(JComponent.java:1272)	at javax.swing.ViewportLayout.preferredLayoutSize(ViewportLayout.java:75)	at java.awt.Container.preferredSize(Container.java:1175)	at java.awt.Container.getPreferredSize(Container.java:1159)	at javax.swing.JComponent.getPreferredSize(JComponent.java:1274)	at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:702)	at java.awt.Container.layout(Container.java:1017)	at java.awt.Container.doLayout(Container.java:1007)	at java.awt.Container.validateTree(Container.java:1089)	at java.awt.Container.validateTree(Container.java:1096)	at java.awt.Container.validateTree(Container.java:1096)	at java.awt.Container.validateTree(Container.java:1096)	at java.awt.Container.validateTree(Container.java:1096)	at java.awt.Container.validate(Container.java:1064)	at java.awt.Window.show(Window.java:450)	at java.awt.Component.show(Component.java:1134)	at java.awt.Component.setVisible(Component.java:1089)	at GroupableHeaderExample.main(GroupableHeaderExample.java:66)