code: public static void saveVMParametersIfNotSet(String classToLaunch, String... parameters) {
  		if (classnameToLaunch == null || "".equals(classnameToLaunch)) { //$NON-NLS-1$
  			saveVMParameters(classToLaunch, parameters);
  		}
  	}
docs: Save parameters that permit to relaunch a VM with
  {@link #relaunchVM()}.
  
  @param classToLaunch is the class which contains a <code>main</code>.
  @param parameters is the parameters to pass to the <code>main</code>.
  @since 6.2