Re: Java error Matlab r2011a

I also have this exact same problem. I'm not sure what happened, but I think it started after I added a javapath when I was not in the correct directory. Is this possibly the problem? I'm using Matlab r2011b.

"Mathieu Lartigaud" wrote in message <jksplf$4e5$1@newscl01ah.mathworks.com>...
> Hello everybody,
>
> I am using Matlab r2011a and I have an error when I try to set Matlab parameters. It seems to be Java which generate this problem :
>
> Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
> at com.sun.java.swing.plaf.windows.XPStyle.getTypeEnumName(Unknown Source)
> at com.sun.java.swing.plaf.windows.XPStyle.getBorder(Unknown Source)
> at com.sun.java.swing.plaf.windows.WindowsLookAndFeel$XPBorderValue.getXPValue(Unknown Source)
> at com.sun.java.swing.plaf.windows.WindowsLookAndFeel$XPValue.createValue(Unknown Source)
> at javax.swing.UIDefaults.getFromHashtable(Unknown Source)
> at javax.swing.UIDefaults.get(Unknown Source)
> at javax.swing.MultiUIDefaults.get(Unknown Source)
> at javax.swing.UIDefaults.getBorder(Unknown Source)
> at javax.swing.UIManager.getBorder(Unknown Source)
> at javax.swing.border.TitledBorder.getBorder(Unknown Source)
> at javax.swing.border.TitledBorder.getBorderInsets(Unknown Source)
> at javax.swing.border.TitledBorder.getBorderInsets(Unknown Source)
> at javax.swing.JComponent.getInsets(Unknown Source)
> at com.mathworks.mwswing.MGridLayout.calcLayoutSize(MGridLayout.java:502)
> at com.mathworks.mwswing.MGridLayout.preferredLayoutSize(MGridLayout.java:519)
> at java.awt.Container.preferredSize(Unknown Source)
> at java.awt.Container.getPreferredSize(Unknown Source)
> at javax.swing.JComponent.getPreferredSize(Unknown Source)
> at com.mathworks.mwswing.MGridLayout.calcLayoutSize(MGridLayout.java:447)
> at com.mathworks.mwswing.MGridLayout.preferredLayoutSize(MGridLayout.java:519)
> at java.awt.Container.preferredSize(Unknown Source)
> at java.awt.Container.getPreferredSize(Unknown Source)
> at javax.swing.JComponent.getPreferredSize(Unknown Source)
> at com.mathworks.widgets.prefs.DefaultPrefsContainer.display(DefaultPrefsContainer.java:201)
> at com.mathworks.widgets.prefs.GenericPrefsDialog$6.nodeDisplayed(GenericPrefsDialog.java:397)
> at com.mathworks.widgets.prefs.AbstractPrefsNavigator.fireNodeDisplayed(AbstractPrefsNavigator.java:48)
> at com.mathworks.widgets.prefs.PrefsNavigationTree.changeNode(PrefsNavigationTree.java:261)
> at com.mathworks.widgets.prefs.PrefsNavigationTree.access$400(PrefsNavigationTree.java:30)
> at com.mathworks.widgets.prefs.PrefsNavigationTree$4.valueChanged(PrefsNavigationTree.java:196)
> at javax.swing.JTree.fireValueChanged(Unknown Source)
> at javax.swing.JTree$TreeSelectionRedirector.valueChanged(Unknown Source)
> at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(Unknown Source)
> at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(Unknown Source)
> at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(Unknown Source)
> at javax.swing.JTree.setSelectionPaths(Unknown Source)
> at com.mathworks.mwswing.MJTree.setSelectionPaths(MJTree.java:939)
> at javax.swing.JTree.setSelectionRows(Unknown Source)
> at com.mathworks.mwswing.MJTree.setSelectionRows(MJTree.java:957)
> at javax.swing.JTree.setSelectionRow(Unknown Source)
> at com.mathworks.mwswing.MJTree.setSelectionRow(MJTree.java:948)
> at com.mathworks.widgets.prefs.PrefsNavigationTree$1.refresh(PrefsNavigationTree.java:91)
> at com.mathworks.widgets.prefs.GenericPrefsDialog.refresh(GenericPrefsDialog.java:283)
> at com.mathworks.mlwidgets.prefs.PrefsDialog.registerPanel(PrefsDialog.java:369)
> at com.mathworks.mlwidgets.prefs.PrefsDialogRegistrar.preRegisterPanels(PrefsDialogRegistrar.java:33)
> at com.mathworks.mlwidgets.prefs.PrefsDialog.initialize(PrefsDialog.java:95)
> at com.mathworks.mlwidgets.prefs.PrefsDialog.access$500(PrefsDialog.java:27)
> at com.mathworks.mlwidgets.prefs.PrefsDialog$4.run(PrefsDialog.java:224)
> at com.mathworks.mlwidgets.prefs.PrefsDialog.showPrefsDialog(PrefsDialog.java:238)
> at com.mathworks.mlwidgets.prefs.PrefsDialog.doShowPrefsDialog(PrefsDialog.java:204)
> at com.mathworks.mlwidgets.prefs.PrefsDialog.showPrefsDialog(PrefsDialog.java:121)
> at com.mathworks.mlwidgets.prefs.PrefsDialog.showLastPrefsDialog(PrefsDialog.java:158)
> at com.mathworks.mlservices.MLPrefsDialogServices.showLastPrefsDialog(MLPrefsDialogServices.java:45)
> at com.mathworks.mde.desk.MLDesktop$PreferencesAction.actionPerformed(MLDesktop.java:2317)
> at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
> at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
> at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
> at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
> at javax.swing.AbstractButton.doClick(Unknown Source)
> at com.mathworks.mwswing.plaf.MBasicMenuItemUI.doClick(MBasicMenuItemUI.java:1185)
> at com.mathworks.mwswing.plaf.MBasicMenuItemUI$MouseInputHandler.mouseReleased(MBasicMenuItemUI.java:1005)
> 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.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)
>
> So I tried to generate a new preference directory by renaming the folder r2011a in the folder C:\Users\AppData\Roaming\Mathworks but it doesn't work.
> I try to download a new version of Java but it doesn't work.
>
> Can anyone help me?
>
> Thanks a lot!