docs: public ClassGraph whitelistClasses(final String... classNames) {
          enableClassInfo();
          for (final String className : classNames) {
              if (className.contains("*")) {
                  throw new IllegalArgumentException("Cannot use a glob wildcard here: " + className);
              }
              final String classNameNormalized = WhiteBlackList.normalizePackageOrClassName(className);
              // Whitelist the class itself
              scanSpec.classWhiteBlackList.addToWhitelist(classNameNormalized);
              scanSpec.classfilePathWhiteBlackList
                      .addToWhitelist(WhiteBlackList.classNameToClassfilePath(classNameNormalized));
              final String packageName = PackageInfo.getParentPackageName(classNameNormalized);
              // Record the package containing the class, so we can recurse to this point even if the package
              // is not itself whitelisted
              scanSpec.classPackageWhiteBlackList.addToWhitelist(packageName);
              scanSpec.classPackagePathWhiteBlackList
                      .addToWhitelist(WhiteBlackList.packageNameToPath(packageName) + "/");
          }
          return this;
      }