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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.checkAccess(SecurityManager.java:733) at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:279) at java.lang.ThreadGroup.getParent(ThreadGroup.java:140) at sun.awt.image.ImageFetcher.add(ImageFetcher.java:75) at sun.awt.image.InputStreamImageSource.startProduction(InputStreamImageSource.java:154) at sun.awt.image.InputStreamImageSource.addConsumer(InputStreamImageSource.java:111) at sun.awt.image.InputStreamImageSource.startProduction(InputStreamImageSource.java:149) at sun.awt.image.ImageRepresentation.startProduction(ImageRepresentation.java:634) at sun.awt.image.Image.addWatcher(Image.java:206) at sun.awt.image.Image.getProperty(Image.java:154) at javax.swing.ImageIcon.<init>(ImageIcon.java:205) at javax.swing.LookAndFeel$1.createValue(LookAndFeel.java:275) at javax.swing.UIDefaults.get(UIDefaults.java:145) at javax.swing.MultiUIDefaults.get(MultiUIDefaults.java:46) at javax.swing.UIDefaults.getIcon(UIDefaults.java:250) at javax.swing.UIManager.getIcon(UIManager.java:476) at javax.swing.plaf.basic.BasicOptionPaneUI.getIconForType(BasicOptionPaneUI.java:504) at javax.swing.plaf.basic.BasicOptionPaneUI.getIcon(BasicOptionPaneUI.java:490) at javax.swing.plaf.basic.BasicOptionPaneUI.addIcon(BasicOptionPaneUI.java:471) at javax.swing.plaf.basic.BasicOptionPaneUI.createMessageArea(BasicOptionPaneUI.java:295) at javax.swing.plaf.basic.BasicOptionPaneUI.installComponents(BasicOptionPaneUI.java:124) at javax.swing.plaf.basic.BasicOptionPaneUI.installUI(BasicOptionPaneUI.java:92) at javax.swing.JComponent.setUI(JComponent.java:325) at javax.swing.JOptionPane.setUI(JOptionPane.java:1425) at javax.swing.JOptionPane.updateUI(JOptionPane.java:1447) at javax.swing.JOptionPane.<init>(JOptionPane.java:1410) at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:670) 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)