Bug 56965 Classpath variable name has to be a valid Java identifier
I20040330 window>preferences>java>classpath variables>new type '444' an error is displayed in the dialog : Invalid name: ''444' is not a valid Java identifier.'. I don't see any reason why the name of the variable has to be a valid Java identifier.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/VariableCreationDialog.java
private IDialogSettings fDialogSettings;
	
	private StringDialogField fNameField;
	private StatusInfo fNameStatus;	
	
	private StringButtonDialogField fPathField;
	private StatusInfo fPathStatus;
	private SelectionButtonDialogField fDirButton;
		
	private CPVariableElement fElement;
	
	private List fExistingNames;
		
	public VariableCreationDialog(Shell parent, CPVariableElement element, List existingNames) {
		super(parent);
		if (element == null) {
			setTitle(NewWizardMessages.getString("VariableCreationDialog.titlenew")); 
		} else {
			setTitle(NewWizardMessages.getString("VariableCreationDialog.titleedit")); 
		}
		
		fDialogSettings= JavaPlugin.getDefault().getDialogSettings();
		
		fElement= element;
		
		fNameStatus= new StatusInfo();