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java.lang.Exception: Stack trace	at java.lang.Thread.dumpStack(Thread.java:993)	at java.security.AccessControlContext.checkPermission(AccessControlContext.java:261)	at java.security.AccessController.checkPermission(AccessController.java:399)	at java.lang.SecurityManager.checkPermission(SecurityManager.java:545)	at java.lang.SecurityManager.checkAwtEventQueueAccess(SecurityManager.java:1399)	at java.awt.Toolkit.getSystemEventQueue(Toolkit.java:1100)	at javax.swing.SystemEventQueueUtilities$SystemEventQueue.get(SystemEventQueueUtilities.java:84)	at javax.swing.SystemEventQueueUtilities$SystemEventQueue.get(SystemEventQueueUtilities.java:116)	at javax.swing.SystemEventQueueUtilities.addRunnableCanvas(SystemEventQueueUtilities.java:258)	at javax.swing.JRootPane.addNotify(JRootPane.java:482)	at java.awt.Container.addNotify(Container.java:1579)	at java.awt.Window.addNotify(Window.java:347)	at java.awt.Dialog.addNotify(Dialog.java:247)	at java.awt.Window.pack(Window.java:365)	at javax.swing.JOptionPane.createDialog(JOptionPane.java:753)	at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:676)	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:521)	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:499)	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:480)	at RMIServer.DBHandler.connectToDB(DBHandler.java:45)	at GUI.mainFrame.source_actionPerformed(mainFrame.java:188)	at GUI.mainFrame$15.actionPerformed(mainFrame.java:434)	at java.awt.Button.processActionEvent(Button.java:329)	at java.awt.Button.processEvent(Button.java:302)	at java.awt.Component.dispatchEventImpl(Component.java:2595)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:319)	at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:103)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:84)