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java.lang.NullPointerException: 	at tbl.TestTable$TM.getRowCount(TestTable.java:45)	at javax.swing.table.DefaultTableModel.setDataVector(DefaultTableModel.java:224)	at javax.swing.table.DefaultTableModel.(DefaultTableModel.java:124)	at javax.swing.table.DefaultTableModel.(DefaultTableModel.java:106)	at javax.swing.table.DefaultTableModel.(DefaultTableModel.java:86)	at tbl.TestTable$TM.(TestTable.java:35)	at tbl.TestTable.initComponents(TestTable.java:28)	at tbl.TestTable.(TestTable.java:24)	at tbl.TestTable.createAndShowGUI(TestTable.java:55)	at tbl.TestTable.access$000(TestTable.java:21)	at tbl.TestTable$1.run(TestTable.java:63)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:711)	at java.awt.EventQueue.access$000(EventQueue.java:104)	at java.awt.EventQueue$3.run(EventQueue.java:672)	at java.awt.EventQueue$3.run(EventQueue.java:670)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:681)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)