assertEquals(expected, written);
    }

    // Helper method to extract string from buffer
    private String extractStringFromBuffer(byte[] buffer, int offset, int maxLen) {
        int end = offset;
        while (end < offset + maxLen && buffer[end] != 0) {
            end++;
        }
        return new String(buffer, offset, end - offset, StandardCharsets.UTF_8);
    }

  public void testRegister() {
    assertEquals(0, registry.getSubscribersForTesting(String.class).size());

    registry.register(new StringSubscriber());
    assertEquals(1, registry.getSubscribersForTesting(String.class).size());

    registry.register(new StringSubscriber());
    assertEquals(2, registry.getSubscribersForTesting(String.class).size());

    registry.register(new ObjectSubscriber());

    ListenableFuture<String> f =
        new SimpleForwardingListenableFuture<String>(immediateFuture("a")) {};
    verify(!(f instanceof FluentFuture));
    assertThat(FluentFuture.from(f).get()).isEqualTo("a");
    // TODO(cpovirk): Test forwarding more extensively.
  }

  public void testAddCallback() {
    FluentFuture<String> f = FluentFuture.from(immediateFuture("a"));

@SuppressWarnings("unused") // For use by NullPointerTester
public class SomeClassThatDoesNotUseNullable {

  void packagePrivateButDoesNotCheckNull(String s) {}

  protected void protectedButDoesNotCheckNull(String s) {}

  public void publicButDoesNotCheckNull(String s) {}

  public static void staticButDoesNotCheckNull(String s) {}

   * are expected.
   *
   * @param string the string representation of a {@code float} value
   * @return the floating point value represented by {@code string}, or {@code null} if {@code
   *     string} has a length of zero or cannot be parsed as a {@code float} value
   * @throws NullPointerException if {@code string} is {@code null}
   * @since 14.0
   */
  @GwtIncompatible // regular expressions

 * {@code @ParametricNullness E}, which means:
 *
 * <ul>
 *   <li>{@code getElement} on a {@code Multiset.Entry<@NonNull String>} returns {@code @NonNull
 *       String}.
 *   <li>{@code getElement} on a {@code Multiset.Entry<@Nullable String>} returns {@code @Nullable
 *       String}.
 * </ul>
 *
 * This is the same behavior as type-variable usages have to Kotlin and to the Checker Framework.
 * Contrast the method above to:

 * {@code @ParametricNullness E}, which means:
 *
 * <ul>
 *   <li>{@code getElement} on a {@code Multiset.Entry<@NonNull String>} returns {@code @NonNull
 *       String}.
 *   <li>{@code getElement} on a {@code Multiset.Entry<@Nullable String>} returns {@code @Nullable
 *       String}.
 * </ul>
 *
 * This is the same behavior as type-variable usages have to Kotlin and to the Checker Framework.
 * Contrast the method above to:

    /**
     * Default constructor.
     */
    public AdminDuplicatehostAction() {
        super();
    }

    /**
     * Role name for duplicate host administration.
     */
    public static final String ROLE = "admin-duplicatehost";

    private static final Logger logger = LogManager.getLogger(AdminDuplicatehostAction.class);

    // ===================================================================================

<% 
Integer statusCode = (Integer)request.getAttribute("jakarta.servlet.error.status_code");
String servletName = (String)request.getAttribute("jakarta.servlet.error.servlet_name");
String requestUri = (String)request.getAttribute("jakarta.servlet.error.request_uri");
String type = request.getParameter("type");
StringBuilder redirectPage = new StringBuilder();
redirectPage.append(((jakarta.servlet.http.HttpServletRequest)request).getContextPath());

<% 
Integer statusCode = (Integer)request.getAttribute("jakarta.servlet.error.status_code");
String servletName = (String)request.getAttribute("jakarta.servlet.error.servlet_name");
String requestUri = (String)request.getAttribute("jakarta.servlet.error.request_uri");
String type = request.getParameter("type");
StringBuilder redirectPage = new StringBuilder();
redirectPage.append(((jakarta.servlet.http.HttpServletRequest)request).getContextPath());