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With current HEAD. Happens every time for me. java.lang.NullPointerException at org.eclipse.cdt.ui.newui.EnvironmentTab.updateData(EnvironmentTab.java:347) at org.eclipse.cdt.ui.newui.EnvironmentTab.updateData(EnvironmentTab.java:321) at org.eclipse.cdt.ui.newui.AbstractCPropertyTab.setVisible(AbstractCPropertyTab.java:243) at org.eclipse.cdt.ui.newui.AbstractCPropertyTab.handleTabEvent(AbstractCPropertyTab.java:541) at org.eclipse.cdt.ui.newui.AbstractPage.setVisible(AbstractPage.java:810) at org.eclipse.jface.preference.PreferenceDialog.showPage(PreferenceDialog.java:1323) at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.showPage(FilteredPreferenceDialog.java:674) at org.eclipse.jface.preference.PreferenceDialog$10.run(PreferenceDialog.java:708) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.preference.PreferenceDialog$9.selectionChanged(PreferenceDialog.java:704) at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:867) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:865) at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1205) at org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1230) at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:251) at org.eclipse.jface.util.OpenStrategy.access$5(OpenStrategy.java:245) at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:419) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4059) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3678) at org.eclipse.jface.window.Window.runEventLoop(Window.java:825) at org.eclipse.jface.window.Window.open(Window.java:801) at org.eclipse.ui.internal.dialogs.WorkbenchPreferenceDialog.open(WorkbenchPreferenceDialog.java:211) at org.eclipse.ui.internal.OpenPreferencesAction.run(OpenPreferencesAction.java:66) at org.eclipse.jface.action.Action.runWithEvent(Action.java:498) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584) at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501) at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4084)
Fixed on HEAD (8.0). Thanks for reporting. Caused by changes of bug 274684.
*** cdt cvs genie on behalf of agvozdev *** bug 330785: NPE opening Build > Environment preference page [*] EnvironmentTab.java 1.29 http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.cdt/all/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/EnvironmentTab.java?root=Tools_Project&r1=1.28&r2=1.29