originalMap.put("refreshKrb5Config", "true");

        @SuppressWarnings("unchecked")
        Map<String, Object> spyOpts = spy(originalMap);

        // Reset the spy to clear any prior invocations from setup
        reset(spyOpts);

        StaticJAASConfiguration cfg = new StaticJAASConfiguration(spyOpts);

        // Act

    @Override
    public @Nullable V remove(Object object) {
      assertTrue(Thread.holdsLock(mutex));
      return super.remove(object);
    }

    @Override
    public void clear() {
      assertTrue(Thread.holdsLock(mutex));
      super.clear();
    }

    @Override
    public boolean containsKey(Object key) {
      assertTrue(Thread.holdsLock(mutex));
      return super.containsKey(key);
    }

    @Override

    }

    /**
     * Sets or clears the specified flag.
     *
     * @param flag
     *            The flag to set/clear (i.e.,
     *            <code>NTLMSSP_NEGOTIATE_OEM</code>).
     * @param value
     *            Indicates whether to set (<code>true</code>) or
     *            clear (<code>false</code>) the specified flag.
     */
    public void setFlag(final int flag, final boolean value) {

 * https://github.com/google/guava/issues/3990
 */
@J2ktIncompatible
@GwtIncompatible
final class Java8Compatibility {
  static void clear(Buffer b) {
    b.clear();
  }

  static void flip(Buffer b) {
    b.flip();
  }

  static void limit(Buffer b, int limit) {
    b.limit(limit);
  }

  static void position(Buffer b, int position) {

 * https://github.com/google/guava/issues/3990
 */
@J2ktIncompatible
@GwtIncompatible
final class Java8Compatibility {
  static void clear(Buffer b) {
    b.clear();
  }

  static void flip(Buffer b) {
    b.flip();
  }

  static void limit(Buffer b, int limit) {
    b.limit(limit);
  }

  static void position(Buffer b, int position) {

  }

  /**
   * A sensible definition of {@link #clear} in terms of the {@code iterator} method of {@link
   * #entrySet}. If you override {@link #entrySet}, you may wish to override {@link #clear} to
   * forward to this implementation.
   *
   * @since 7.0
   */
  @Override
  protected void standardClear() {
    Iterators.clear(entrySet().iterator());
  }

  /**

     * pool thread, the thread pool will reset it for us. Otherwise, the interrupted bit may have
     * been intended for something else, so don't clear it.
     */
    boolean restoreInterruptedBit = false;
    int spinCount = 0;
    // Interrupting Cow Says:
    //  ______
    // < Spin >
    //  ------
    //        \   ^__^

		res = append(res, "SUB")
	}
	return "[" + strings.Join(res, ",") + "]"
}

// Set one or more flags on f.
func (f *Flags) Set(flags Flags) {
	*f |= flags
}

// Clear one or more flags on f.
func (f *Flags) Clear(flags Flags) {
	*f &^= flags
}

// parse an incoming message.
func (m *message) parse(b []byte) (*subHandlerID, []byte, error) {
	var sub *subHandlerID
	if m.Payload == nil {

 * https://github.com/google/guava/issues/3990
 */
@J2ktIncompatible
@GwtIncompatible
final class Java8Compatibility {
  static void clear(Buffer b) {
    b.clear();
  }

  static void flip(Buffer b) {
    b.flip();
  }

  static void limit(Buffer b, int limit) {
    b.limit(limit);
  }

  static void mark(Buffer b) {
    b.mark();
  }

/**
 * Wrappers around {@link Buffer} methods that are covariantly overridden in Java 9+. See
 * https://github.com/google/guava/issues/3990
 */
@GwtIncompatible
final class Java8Compatibility {
  static void clear(Buffer b) {
    b.clear();
  }

  static void flip(Buffer b) {
    b.flip();
  }

  static void limit(Buffer b, int limit) {
    b.limit(limit);
  }

  static void position(Buffer b, int position) {