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