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java.lang.NullPointerException: 	at javax.swing.JTable$1.getRowCount(JTable.java:686)	at javax.swing.JTable.getRowCount(JTable.java:2662)	at javax.swing.plaf.basic.BasicTableUI.createTableSize(BasicTableUI.java:1692)	at javax.swing.plaf.basic.BasicTableUI.getPreferredSize(BasicTableUI.java:1733)	at javax.swing.JComponent.getPreferredSize(JComponent.java:1662)	at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:791)	at java.awt.Container.layout(Container.java:1510)	at java.awt.Container.doLayout(Container.java:1499)	at java.awt.Container.validateTree(Container.java:1695)	at java.awt.Container.validateTree(Container.java:1704)	at java.awt.Container.validateTree(Container.java:1704)	at java.awt.Container.validateTree(Container.java:1704)	at java.awt.Container.validateTree(Container.java:1704)	at java.awt.Container.validate(Container.java:1630)	at java.awt.Window.dispatchEventImpl(Window.java:2748)	at java.awt.Component.dispatchEvent(Component.java:4713)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)