public PsiClass checkClassName(final String className, final @NlsContexts.DialogMessage String errorMessage) throws RuntimeConfigurationException {
    if (className == null || className.length() == 0) {
      throw new RuntimeConfigurationError(errorMessage);
    }
    return findNotNullClass(className);
  }
public PsiClass checkClassName(final String className, final @NlsContexts.DialogMessage String errorMessage)