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java.sql.SQLException: Query can not be null or empty at PeptId.MyJFrame1.jButton4ActionPerformed(MyJFrame1.java:145) at PeptId.MyJFrame1$4.actionPerformed(MyJFrame1.java:84) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1819) at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1872) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258) at javax.swing.plaf.basic.BasicButtonListener$ReleasedAction.actionPerformed(BasicButtonListener.java:303) at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1535) at javax.swing.JComponent.processKeyBinding(JComponent.java:2438) at javax.swing.JComponent.processKeyBindings(JComponent.java:2473) at javax.swing.JComponent.processKeyEvent(JComponent.java:2401) at java.awt.Component.processEvent(Component.java:4909) at java.awt.Container.processEvent(Container.java:1569) at java.awt.Component.dispatchEventImpl(Component.java:3615) at java.awt.Container.dispatchEventImpl(Container.java:1627) at java.awt.Component.dispatchEvent(Component.java:3477) at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1713) at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:627) at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:831) at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:741) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:592) at java.awt.Component.dispatchEventImpl(Component.java:3506) at java.awt.Container.dispatchEventImpl(Container.java:1627) at java.awt.Window.dispatchEventImpl(Window.java:1606) at java.awt.Component.dispatchEvent(Component.java:3477) at java.awt.EventQueue.dispatchEvent(EventQueue.java:456) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:178) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:170) at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)