Bug 35265 NPE in classpath variables page
Build: I-20030317 I was switching back and forth between target platform and classpath variables preference pages, changing values on target platform page and seeing if changes are reflected on classpath variables page. At some point, I got the following null pointer: java.lang.NullPointerException at org.eclipse.jdt.internal.ui.wizards.buildpaths.CPVariableElementLabelProvider.ge tImage(CPVariableElementLabelProvider.java:55) at org.eclipse.jface.viewers.TableViewer.doUpdateItem(TableViewer.java:202) at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run (StructuredViewer.java:119) at org.eclipse.core.internal.runtime.InternalPlatform.run (InternalPlatform.java:867) at org.eclipse.core.runtime.Platform.run(Platform.java:413) at org.eclipse.jface.viewers.StructuredViewer.updateItem (StructuredViewer.java:1271) at org.eclipse.jface.viewers.TableViewer.internalRefresh(TableViewer.java:454) at org.eclipse.jface.viewers.TableViewer.internalRefresh(TableViewer.java:431) at org.eclipse.jface.viewers.StructuredViewer$7.run(StructuredViewer.java:861) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection (StructuredViewer.java:801) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:859) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:821) at org.eclipse.jdt.internal.ui.wizards.dialogfields.ListDialogField.refresh (ListDialogField.java:739) at org.eclipse.jdt.internal.ui.wizards.buildpaths.VariableBlock.refresh (VariableBlock.java:406) at org.eclipse.jdt.internal.ui.preferences.ClasspathVariablesPreferencePage.setVisi ble(ClasspathVariablesPreferencePage.java:80) at org.eclipse.jface.preference.PreferenceDialog.showPage (PreferenceDialog.java:1064) at org.eclipse.jface.preference.PreferenceDialog$9.run (PreferenceDialog.java:496)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/VariableBlock.java
try {
			IJavaModel model= JavaCore.create(ResourcesPlugin.getWorkspace().getRoot());
			IJavaProject[] projects= model.getJavaProjects();
			for (int i= 0; i < projects.length; i++) {
				IClasspathEntry[] entries= projects[i].getRawClasspath();
				for (int k= 0; k < entries.length; k++) {
					IClasspathEntry curr= entries[k];
					if (curr.getEntryKind() == IClasspathEntry.CPE_VARIABLE) {
						String var= curr.getPath().segment(0);
						if (removed.contains(var) || changed.contains(var)) {
							return true;
						}
					}
				}
			}
		} catch (JavaModelException e) {
			return true;
		}
		return false;
	}
	
	private class VariableBlockRunnable implements IRunnableWithProgress {
		private List fToRemove;
		private List fToChange;
		private boolean fDoBuild;
		
		public VariableBlockRunnable(List toRemove, List toChange, boolean doBuild) {
			fToRemove= toRemove;
			fToChange= toChange;
			fDoBuild= doBuild;