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
ArrayList elements= new ArrayList(entries.length);
		for (int i= 0; i < entries.length; i++) {
			String name= entries[i];
			CPVariableElement elem;
			IPath entryPath= JavaCore.getClasspathVariable(name);
			if (entryPath != null) {
				elem= new CPVariableElement(name, entryPath, reserved.contains(name));
				elements.add(elem);
				if (name.equals(initSelection)) {
					initSelectedElement= elem;
				}
			} else {				
				JavaPlugin.logErrorMessage("VariableBlock: Classpath variable with null value: " + name); 
			}
		}
		
		fVariablesList.setElements(elements);
		
		if (initSelectedElement != null) {
			ISelection sel= new StructuredSelection(initSelectedElement);
			fVariablesList.selectElements(sel);
		} else {
			fVariablesList.selectFirstElement();
		}
	}
	
	private String[] getReservedVariableNames() {
		return new String[] {
			JavaRuntime.JRELIB_VARIABLE,
			JavaRuntime.JRESRC_VARIABLE,