* @return the extractor instance for processing the document
     * @throws FessSystemException if no suitable extractor can be found
     */
    @Override
    protected Extractor getExtractor(final ResponseData responseData) {
        final ExtractorFactory extractorFactory = ComponentUtil.getExtractorFactory();
        if (extractorFactory == null) {
            throw new FessSystemException("Could not find extractorFactory.");
        }

        validateIdentity();
    }

    private void validateIdentity() {
        if (empty(groupId)) {
            throw new InvalidArtifactRTException(
                    groupId, artifactId, getVersion(), type, "The groupId cannot be empty.");
        }

        if (empty(artifactId)) {
            throw new InvalidArtifactRTException(
                    groupId, artifactId, getVersion(), type, "The artifactId cannot be empty.");

        } catch (final Exception ignored) {}
    }

    protected void handleFileUploadException(final FileUploadException e) throws ServletException {
        // suppress logging because it can be caught by logging filter
        //log.error("Failed to parse multipart request", e);
        throw new ServletException("Failed to upload the file.", e);
    }

        assertArgumentNotNull("is", is);
        assertArgumentNotEmpty("encoding", encoding);

        try {
            return new InputStreamReader(is, encoding);
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    /**
     * Creates a {@link Reader} to read from a file with the default encoding.
     *
     * @param file
     *            the file (must not be {@literal null})

        setAlpnProtocols.invoke(
          sslSocket,
          Platform.concatLengthPrefixed(protocols),
        )
      } catch (e: IllegalAccessException) {
        throw AssertionError(e)
      } catch (e: InvocationTargetException) {
        throw AssertionError(e)
      }
    }
  }

  override fun getSelectedProtocol(sslSocket: SSLSocket): String? {
    // No TLS extensions if the socket class is custom.

            throw new TransportException(expectedMessage);
        });

        // Test throwing and catching with cause
        RuntimeException cause = new RuntimeException("Cause");
        TransportException thrown = assertThrows(TransportException.class, () -> {
            throw new TransportException(cause);
        });
        assertEquals(cause, thrown.getCause());

      throw new UnsupportedOperationException();
    }

    @Override
    public boolean putAll(@ParametricNullness K key, Iterable<? extends V> values) {
      throw new UnsupportedOperationException();
    }

    @Override
    public boolean putAll(Multimap<? extends K, ? extends V> multimap) {
      throw new UnsupportedOperationException();
    }

    @Override

    }

    private void parse(final byte[] material) throws IOException {
        for (int i = 0; i < 8; i++) {
            if (material[i] != NTLMSSP_SIGNATURE[i]) {
                throw new IOException("Not an NTLMSSP message.");
            }
        }
        if (readULong(material, 8) != 1) {
            throw new IOException("Not a Type 1 message.");
        }

    Exception exception = new Exception("deliberate");
    TestService service =
        new TestService() {
          @Override
          protected void startUp() throws Exception {
            super.startUp();
            throw exception;
          }
        };
    assertEquals(0, service.startUpCalled);
    RuntimeException e =
        assertThrows(RuntimeException.class, () -> service.startAsync().awaitRunning());

      if (index == null) {
        throw new IllegalArgumentException(
            getKeyRole() + " " + key + " not in " + keyIndex.keySet());
      }
      return setValue(index, value);
    }

    @Override
    public @Nullable V remove(@Nullable Object key) {
      throw new UnsupportedOperationException();
    }

    @Override
    public void clear() {
      throw new UnsupportedOperationException();
    }