Bonjour à tous j'ai une question bête car je ne maîtrise pas particulièrement les applets java mais j'aimerai savoir qu'est-ce qui peut expliquer d'une manière générale qu'une application java applet s'execute parfaitement dans son environnement de programmation et qu'elle puisse engendrer des erreur telles que des NullPointerException lorsqu'elle est exécuter à partir du navigateur WEB ?

Pour ma part vous vous doutez bien que c'est le cas, mon applet fonctionne parfaitement sous eclipse mais lorsque je veux l'executer à partir de Firefox ou IE j'ai les erreurs suivantes dans la JavaConsole :

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Exception in thread "Thread-117" java.lang.NullPointerException
	at com.ibm.labeling.ui.JPanelPrintLabel$2.actionPerformed(JPanelPrintLabel.java:1110)
	at javax.swing.JComboBox.fireActionEvent(Unknown Source)
	at javax.swing.JComboBox.contentsChanged(Unknown Source)
	at javax.swing.AbstractListModel.fireContentsChanged(Unknown Source)
	at javax.swing.DefaultComboBoxModel.setSelectedItem(Unknown Source)
	at javax.swing.DefaultComboBoxModel.addElement(Unknown Source)
	at javax.swing.JComboBox.addItem(Unknown Source)
	at com.ibm.labeling.ui.JPanelPrintLabel.getJComboBoxStandard(JPanelPrintLabel.java:1380)
	at com.ibm.labeling.ui.JPanelPrintLabel.getJPanelFilter(JPanelPrintLabel.java:780)
	at com.ibm.labeling.ui.JPanelPrintLabel.getJPanelLabels(JPanelPrintLabel.java:749)
	at com.ibm.labeling.ui.JPanelPrintLabel.initialize(JPanelPrintLabel.java:674)
	at com.ibm.labeling.ui.JPanelPrintLabel.<init>(JPanelPrintLabel.java:92)
	at com.ibm.labeling.ui.JMainPanel.printLabel(JMainPanel.java:60)
	at com.ibm.labeling.tool.ClientManager.run(ClientManager.java:47)
	at java.lang.Thread.run(Unknown Source)

ou encore :

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Exception occurred during event dispatching:
java.lang.ExceptionInInitializerError
	at com.ibm.swat.password.cwa2.<clinit>(cwa2.java:68)
	at com.ibm.labeling.ui.JDialogLogOn$2.actionPerformed(JDialogLogOn.java:238)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.Dialog$1.run(Unknown Source)
	at java.awt.Dialog$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.Dialog.show(Unknown Source)
	at java.awt.Component.show(Unknown Source)
	at java.awt.Component.setVisible(Unknown Source)
	at java.awt.Window.setVisible(Unknown Source)
	at java.awt.Dialog.setVisible(Unknown Source)
	at com.ibm.labeling.ui.MainJFrame$1.actionPerformed(MainJFrame.java:198)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.security.AccessControlException: access denied (java.util.PropertyPermission javax.net.debug read)
	at java.security.AccessControlContext.checkPermission(Unknown Source)
	at java.security.AccessController.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
	at java.lang.System.getProperty(Unknown Source)
	at com.ibm.jsse.JSSEProvider$1.run(JSSEProvider$1.java:1)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.ibm.jsse.JSSEProvider.<clinit>(JSSEProvider.java:25)
	... 58 more