return (javaUtilOptional == null) ? null : fromNullable(javaUtilOptional.orElse(null));
  }

  /**
   * Returns the equivalent {@code java.util.Optional} value to the given {@code
   * com.google.common.base.Optional}, or {@code null} if the argument is null.
   *
   * <p>If {@code googleOptional} is known to be non-null, use {@code googleOptional.toJavaUtil()}
   * instead.
   *

    assertEquals("null [null, null]", Strings.lenientFormat("%s", null, null, null));
    assertEquals("null [5, 6]", Strings.lenientFormat(null, 5, 6));
    assertEquals("null", Strings.lenientFormat("%s", (Object) null));
  }

  @J2ktIncompatible // TODO(b/319404022): Allow passing null array as varargs
  public void testLenientFormat_nullArrayVarargs() {

    /**
     * Reads the model from the specified file.
     *
     * @param input The file to deserialize the model from, must not be {@code null}.
     * @param options The options to use for deserialization, may be {@code null} to use the default values.
     * @return The deserialized model, never {@code null}.
     * @throws IOException If the model could not be deserialized.
     * @throws ModelParseException If the input format could not be parsed.

                .installationSettingsSource(
                        installationSettingsPath != null && Files.exists(installationSettingsPath)
                                ? Source.fromPath(installationSettingsPath)
                                : null)
                .projectSettingsSource(
                        projectSettingsPath != null && Files.exists(projectSettingsPath)

                    val someVal: String? = null
                    var someVar: String? = null
                    fun foo(): String? = null
                }
            """
        ) {
            assertHasErrors(
                "Method com.example.Source.foo(): From non-null returning to null returning breaking change.",
                "Method com.example.Source.getSomeVal(): From non-null returning to null returning breaking change.",

        return "Type2Message[target=" + targetString + ",challenge=" + ( challengeBytes == null ? "null" : "<" + challengeBytes.length + " bytes>" )
                + ",context=" + ( contextBytes == null ? "null" : "<" + contextBytes.length + " bytes>" ) + ",targetInformation="
                + ( targetInformationBytes == null ? "null" : "<" + targetInformationBytes.length + " bytes>" ) + ",flags=0x"

                    it.set(MavenPropertiesLoader.substVars(it.next(), null, null, callback));
                }
            }
            commandLineBuilder.addOption(option);
        }
        for (String arg : cliRequest.commandLine.getArgList()) {
            commandLineBuilder.addArg(MavenPropertiesLoader.substVars(arg, null, null, callback));
        }
        cliRequest.commandLine = commandLineBuilder.build();

    assertTrue(multimap().putAll(k0(), Lists.newArrayList(v3(), null)));
    assertGet(k0(), v0(), v3(), null);
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_VALUES})
  public void testPutAllNullValueOnAbsentKey_supported() {
    assertTrue(multimap().putAll(k3(), Lists.newArrayList(v3(), null)));
    assertGet(k3(), v3(), null);
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)

    assertThat(callbacks.remove()).isEqualTo(Event(null, null, "third event"))
  }

  @Test
  fun nakedFieldNames() {
    consumeEvents(
      """
      |data
      |
      |data
      |data
      |
      |data:
      |
      """.trimMargin(),
    )
    assertThat(callbacks.remove()).isEqualTo(Event(null, null, ""))

    protected ResponseData processRequest(final String uri, final boolean includeContent) {
        if (smbAuthenticationHolder == null) {
            init();
        }

        // start
        AccessTimeoutTarget accessTimeoutTarget = null;
        TimeoutTask accessTimeoutTask = null;
        if (accessTimeout != null) {
            accessTimeoutTarget = new AccessTimeoutTarget(Thread.currentThread());