java.lang.NullPointerException: This exception has no message.

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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)

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