if (contextClassLoader != null) {
            return contextClassLoader;
        }

        final ClassLoader targetClassLoader = targetClass.getClassLoader();
        final ClassLoader thisClassLoader = ClassLoaderUtil.class.getClassLoader();
        if (targetClassLoader != null && thisClassLoader != null) {
            if (isAncestor(thisClassLoader, targetClassLoader)) {

                }
            }

            if ( "null".equals( versioning.getLastUpdated() ) )
            {
                versioning.setLastUpdated( null );
            }

            if ( "null".equals( v.getLastUpdated() ) )
            {
                v.setLastUpdated( null );
            }

            if ( versioning.getLastUpdated() == null || versioning.getLastUpdated().length() == 0 )
            {

                this.systemProperties =
                        systemProperties != null ? Map.copyOf(systemProperties) : session.getSystemProperties();
                this.userProperties = userProperties != null ? Map.copyOf(userProperties) : session.getUserProperties();
                this.repositoryMerging = repositoryMerging;

                .setState(state)//
                .build();
    }

    protected byte[] decodeBase64(String base64String) {
        if (base64String == null) {
            return null;
        }
        try {
            return BASE64_DECODER.decode(base64String);
        } catch (IllegalArgumentException e) {
            if (e.getCause() instanceof DecodingException) {

            }
        }
        return null;
    }

    protected Integer getAttributeAsInteger(final NamedNodeMap attributes, final String name) {
        final Node namedItem = attributes.getNamedItem(name);
        if (namedItem == null) {
            return null;
        }
        final String value = namedItem.getTextContent();
        if (value == null) {
            return null;
        }
        try {

  if (result.containsInvalidLabelLengths()) return null

  return result
}

internal fun idnToAscii(host: String): String? {
  val bufferA = Buffer().writeUtf8(host)
  val bufferB = Buffer()

  // 1. Map, from bufferA to bufferB.
  while (!bufferA.exhausted()) {
    val codePoint = bufferA.readUtf8CodePoint()
    if (!IDNA_MAPPING_TABLE.map(codePoint, bufferB)) return null
  }

             * is serviced. The alternative complicates things
             * more than I think is worth it.
             */

            if( socket != null ) {
                socket.close();
                socket = null;
            }
            thread = null;
            responseTable.clear();
        }
    }
    public void run() {
        int nameTrnId;
        NameServicePacket response;

    protected void assertObjectNotNull(String variableName, Object value) {
        if (variableName == null) {
            String msg = "The value should not be null: variableName=null value=" + value;
            throw new IllegalArgumentException(msg);
        }
        if (value == null) {
            String msg = "The value should not be null: variableName=" + variableName;
            throw new IllegalArgumentException(msg);
        }

    protected void assertObjectNotNull(String variableName, Object value) {
        if (variableName == null) {
            String msg = "The value should not be null: variableName=null value=" + value;
            throw new IllegalArgumentException(msg);
        }
        if (value == null) {
            String msg = "The value should not be null: variableName=" + variableName;
            throw new IllegalArgumentException(msg);
        }

                            valueClass == null ? null : valueClass.getName(), valueClass == null ? null : valueClass.getClassLoader(),
                            value, targetClass == null ? null : targetClass.getName(),
                            targetClass == null ? null : targetClass.getClassLoader()),
                    e);
        }
    }

    /**
     * インスタンスフィールドかどうか返します。