java.lang.NullPointerException

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  • How to see true origin of exception?
    via by Libor Jelinek,
    • java.lang.NullPointerException at org.openide.windows.OpenComponentAction.actionPerformed(OpenComponentAction.java:89) at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:137) at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:95) at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116) at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:99) at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:140) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.AbstractButton.doClick(AbstractButton.java:376) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877) at java.awt.Component.processMouseEvent(Component.java:6437) at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) at java.awt.Component.processEvent(Component.java:6202) at java.awt.Container.processEvent(Container.java:2213) at java.awt.Component.dispatchEventImpl(Component.java:4793) at java.awt.Container.dispatchEventImpl(Container.java:2271) at java.awt.Component.dispatchEvent(Component.java:4619) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4816) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4476) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4406) at java.awt.Container.dispatchEventImpl(Container.java:2257) at java.awt.Window.dispatchEventImpl(Window.java:2677) at java.awt.Component.dispatchEvent(Component.java:4619) at java.awt.EventQueue.dispatchEvent(EventQueue.java:662) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148)
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