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via Oracle Community by 807587, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at MyProject.GroupableTableHeaderUI.getHeaderHeight(GroupableHeaderExample.java:345)	at MyProject.GroupableTableHeaderUI.createHeaderSize(GroupableHeaderExample.java:366)	at MyProject.GroupableTableHeaderUI.getPreferredSize(GroupableHeaderExample.java:376)	at javax.swing.JComponent.getPreferredSize(JComponent.java:1262)	at javax.swing.ViewportLayout.preferredLayoutSize(ViewportLayout.java:75)	at java.awt.Container.preferredSize(Container.java:1134)	at java.awt.Container.getPreferredSize(Container.java:1118)