<exclude>org.apache.maven.model.Contributor#addProperty(java.lang.String,java.lang.String):METHOD_REMOVED</exclude>
              <exclude>org.apache.maven.model.Dependency#clearManagementKey():METHOD_REMOVED</exclude>
              <exclude>org.apache.maven.model.ModelBase#addProperty(java.lang.String,java.lang.String):METHOD_REMOVED</exclude>

  val packageName = "okhttp3.internal.idn"
  val idnaMappingTable = ClassName(packageName, "IdnaMappingTable")

  return FileSpec.builder(packageName, "IdnaMappingTableInstance")
    .addProperty(
      PropertySpec.builder("IDNA_MAPPING_TABLE", idnaMappingTable)
        .addModifiers(KModifier.INTERNAL)
        .initializer(
          """
          |%T(⇥
          |sections = "%L",
          |ranges = "%L",

        if (StringUtil.isBlank(key) || StringUtil.isBlank(value)) {
            throw new CrawlerSystemException("key or value is null.");
        }

        featureMap.put(key, value);
    }

    public void addProperty(final String key, final String value) {
        if (StringUtil.isBlank(key) || StringUtil.isBlank(value)) {
            throw new CrawlerSystemException("key or value is null.");
        }