Cita:
Iniciado por Fuzzylog 
Ahi solo pones DONDE se produce la excepción, pero no cual es la excepción, sería interesante disponer de toda la traza para poder analizarla.
Aqui esta todo lo que mi terminal Fedora linux hace durante el proceso de ejecucion:
Cita: [stivenson@ROCKERITO ~]$ cd /home/stivenson/Escritorio/Applets/ProyectoAppletCompetencia/src/PaquetePrincipal
[stivenson@ROCKERITO PaquetePrincipal]$ appletviewer PruevaJuegoCompetencia.html
6/12/2010 06:24:34 PM com.sun.corba.se.impl.ior.IORImpl getProfile
ADVERTENCIA: "IOP00511201: (INV_OBJREF) IOR must have at least one IIOP profile"
org.omg.CORBA.INV_OBJREF: vmcid: SUN minor code: 1201 completed: No
at com.sun.corba.se.impl.logging.IORSystemException.i orMustHaveIiopProfile(IORSystemException.java:473)
at com.sun.corba.se.impl.logging.IORSystemException.i orMustHaveIiopProfile(IORSystemException.java:495)
at com.sun.corba.se.impl.ior.IORImpl.getProfile(IORIm pl.java:334)
at com.sun.corba.se.impl.encoding.CDRInputStream_1_0. read_Object(CDRInputStream_1_0.java:787)
at com.sun.corba.se.impl.encoding.CDRInputStream_1_0. read_Object(CDRInputStream_1_0.java:761)
at com.sun.corba.se.impl.encoding.CDRInputStream.read _Object(CDRInputStream.java:231)
at com.sun.corba.se.impl.resolver.INSURLOperationImpl .getIORFromString(INSURLOperationImpl.java:120)
at com.sun.corba.se.impl.resolver.INSURLOperationImpl .operate(INSURLOperationImpl.java:130)
at com.sun.corba.se.impl.orb.ORBImpl.string_to_object (ORBImpl.java:836)
at org.GNOME.Accessibility.AccessUtil.getRegistryObje ct(AccessUtil.java:143)
at org.GNOME.Accessibility.JavaBridge.registerApplica tion(JavaBridge.java:1099)
at org.GNOME.Accessibility.JavaBridge.<init>(JavaBrid ge.java:364)
at sun.reflect.NativeConstructorAccessorImpl.newInsta nce0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInsta nce(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newI nstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Construc tor.java:532)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at java.awt.Toolkit.loadAssistiveTechnologies(Toolkit .java:786)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:87 5)
at java.awt.Window.getToolkit(Window.java:1170)
at java.awt.Window.init(Window.java:400)
at java.awt.Window.<init>(Window.java:438)
at java.awt.Frame.<init>(Frame.java:419)
at java.awt.Frame.<init>(Frame.java:384)
at sun.applet.AppletViewer.<init>(AppletViewer.java:1 59)
at sun.applet.StdAppletViewerFactory.createAppletView er(AppletViewer.java:100)
at sun.applet.AppletViewer.parse(AppletViewer.java:11 40)
at sun.applet.AppletViewer.parse(AppletViewer.java:10 74)
at sun.applet.Main.run(Main.java:156)
at sun.applet.Main.main(Main.java:98)
Exception occurred during event dispatching:
java.lang.NullPointerException
at JUEGO_1_Calculo.IniciarExpre(JUEGO_1_Calculo.java: 49)
at JUEGO_1_Calculo.<init>(JUEGO_1_Calculo.java:13)
at Menu$2.actionPerformed(Menu.java:38)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:2012)
at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2335)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:404)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:253)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:289)
at java.awt.Component.processMouseEvent(Component.jav a:6108)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3267)
at java.awt.Component.processEvent(Component.java:587 3)
at java.awt.Container.processEvent(Container.java:210 5)
at java.awt.Component.dispatchEventImpl(Component.jav a:4469)
at java.awt.Container.dispatchEventImpl(Container.jav a:2163)
at java.awt.Component.dispatchEvent(Component.java:42 95)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4461)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:4125)
at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:4055)
at java.awt.Container.dispatchEventImpl(Container.jav a:2149)
at java.awt.Window.dispatchEventImpl(Window.java:2478 )
at java.awt.Component.dispatchEvent(Component.java:42 95)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 604)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:194)
at java.awt.Dialog$1.run(Dialog.java:1072)
at java.awt.Dialog$3.run(Dialog.java:1126)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1124)
at javax.swing.JOptionPane.showOptionDialog(JOptionPa ne.java:871)
at JuegoCompetencia.actionPerformed(JuegoCompetencia. java:188)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:2012)
at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2335)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:404)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:253)
at java.awt.Component.processMouseEvent(Component.jav a:6108)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3267)
at java.awt.Component.processEvent(Component.java:587 3)
at java.awt.Container.processEvent(Container.java:210 5)
at java.awt.Component.dispatchEventImpl(Component.jav a:4469)
at java.awt.Container.dispatchEventImpl(Container.jav a:2163)
at java.awt.Component.dispatchEvent(Component.java:42 95)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4461)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:4125)
at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:4055)
at java.awt.Container.dispatchEventImpl(Container.jav a:2149)
at java.awt.Component.dispatchEvent(Component.java:42 95)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 604)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:138)