public boolean addAll(Collection<? extends E> elementsToAdd) {
    throw up();
  }

  @Override
  public boolean removeAll(Collection<?> elementsToRemove) {
    throw up();
  }

  @Override
  public boolean retainAll(Collection<?> elementsToRetain) {
    throw up();
  }

  @Override
  public void clear() {
    throw up();
  }

  private static UnsupportedOperationException up() {

        if (token.length <= 0) {
            throw new PACDecodingException("Empty kerberos ApReq");
        }

        ASN1Sequence sequence;
        try {
            try (ASN1InputStream stream = new ASN1InputStream(new ByteArrayInputStream(token))) {
                sequence = ASN1Util.as(ASN1Sequence.class, stream);
            }
        } catch (IOException e) {
            throw new PACDecodingException("Malformed Kerberos Ticket", e);

                    cleanupThread(timeout);
                    throw new ConnectionTimeoutException("Connection timeout");
                case 2:
                    if (this.te != null) { /* doConnect throw Exception */
                        this.state = 4; /* error */
                        cleanupThread(timeout);
                        throw this.te;
                    }
                    this.state = 3; /* Success! */

     */
    protected ResponseData doGet(final String url) {
        throw new CrawlerSystemException("GET method is not supported.");
    }

    /**
     * Performs a HEAD request.
     * @param url The URL to request.
     * @return The ResponseData.
     */
    protected ResponseData doHead(final String url) {
        throw new CrawlerSystemException("HEAD method is not supported.");
    }

    /**

   *
   * @deprecated unsupported operation
   * @throws UnsupportedOperationException always
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public @Nullable B put(TypeToken<? extends B> key, B value) {
    throw new UnsupportedOperationException();
  }

  /**

   *     write {@code throw sneakyThrow(t);} to convince the compiler that the statement will always
   *     throw.
   */
  @CanIgnoreReturnValue
  static Error sneakyThrow(Throwable t) {
    throw new SneakyThrows<Error>().throwIt(t);
  }

  @SuppressWarnings("unchecked") // not really safe, but that's the point
  private Error throwIt(Throwable t) throws T {
    throw (T) t;
  }

  private SneakyThrows() {}

        } catch (PluginResolutionException e) {
            throw new PluginNotFoundException(plugin, project.getPluginArtifactRepositories());
        } catch (PluginDescriptorParsingException | InvalidPluginDescriptorException e) {
            throw new PluginManagerException(plugin, e.getMessage(), e);
        }
    }

                blob.toBuilder().setMetadata(tags).build().update();
            } else {
                throw new StorageException("Object not found: " + objectName);
            }
        } catch (final StorageException e) {
            throw e;
        } catch (final Exception e) {
            throw new StorageException("Failed to update tags for " + objectName, e);
        }
    }

    @Override

  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public final @Nullable E pollFirst() {
    throw new UnsupportedOperationException();
  }

  /**
   * Guaranteed to throw an exception and leave the set unmodified.
   *
   * @since 12.0
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated

    if (key == null) {
      throw new NullPointerException("null key in entry: null=" + value);
    } else if (value == null) {
      throw new NullPointerException("null value in entry: " + key + "=null");
    }
  }

  @CanIgnoreReturnValue
  static int checkNonnegative(int value, String name) {
    if (value < 0) {
      throw new IllegalArgumentException(name + " cannot be negative but was: " + value);