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
if (path != null) {
				fPathField.setText(path.toString());
			}
		}
	}
	
	private void doFieldUpdated(DialogField field) {	
		if (field == fNameField) {
			fNameStatus= nameUpdated();
		} else if (field == fPathField) {
			fPathStatus= pathUpdated();
		} else if (field == fDirButton) {
			IPath path= chooseExtDirectory();
			if (path != null) {
				fPathField.setText(path.toString());
			}
		}		
		updateStatus(StatusUtil.getMoreSevere(fPathStatus, fNameStatus));
	}		
	
	private StatusInfo nameUpdated() {
		StatusInfo status= new StatusInfo();
		String name= fNameField.getText();
		if (name.length() == 0) {
			status.setError(NewWizardMessages.getString("VariableCreationDialog.error.entername")); 
			return status;
		}
		IStatus val= JavaConventions.validateIdentifier(name);
		if (val.matches(IStatus.ERROR)) {
			status.setError(NewWizardMessages.getFormattedString("VariableCreationDialog.error.invalidname", val.getMessage()));