val address = canonicalizeInetAddress(inetAddressByteArray)
    if (address.size == 16) return inet6AddressToAscii(address)
    if (address.size == 4) return inet4AddressToAscii(address) // An IPv4-mapped IPv6 address.
    throw AssertionError("Invalid IPv6 address: '$host'")
  }

  val result = idnToAscii(host) ?: return null
  if (result.isEmpty()) return null
  if (result.containsInvalidHostnameAsciiCodes()) return null

```

### Exception Handling
```java
import org.codelibs.core.exception.*;

// Runtime exception wrappers eliminate try-catch boilerplate
try {
    // Code that might throw checked exceptions
    return ClassUtil.newInstance(className); // Wraps checked exceptions automatically
} catch (ClassNotFoundRuntimeException e) {
    // Handle the wrapped exception

            bb.putShort((short) 0); // tflags high bytes

            // Invalid referral version
            bb.putShort((short) 99); // unsupported version

            // Should throw exception for unsupported version
            assertThrows(Exception.class, () -> {
                buffer.decode(testBuffer, 0, testBuffer.length);
            });
        }
    }

    @Nested

        try {
            return createCharMappingItem(this, form, hook);
        } catch (final ValidationErrorException e) {
            saveToken();
            throw e;
        }
    }

    /**
     * Create a char mapping item.
     * @param action The action.
     * @param form The create form.
     * @param hook The error hook.

    }

    @Test
    public void test_encodeUrl_empty_and_null() {
        assertEquals("", DocumentUtil.encodeUrl(""));
        try {
            DocumentUtil.encodeUrl(null);
            fail("Should throw NullPointerException");
        } catch (NullPointerException e) {
            // Expected
        }
    }

    @Test
    public void test_encodeUrl_unicode() {

        transaction.setDataCount(0xFFFFFFFF);
        transaction.setDataOffset(0xFFFFFFFF);
        transaction.setSetupCount(0xFF);

        // Execute the method - should not throw exception
        assertDoesNotThrow(() -> transaction.writeParameterWordsWireFormat(dst, 0));
    }

    @Test
    @DisplayName("Test multiple setup count handling")
    void testMultipleSetupCount() {

    private int crc1 = 0;
    private int crc2 = 0;
    private int crc3 = 0;

    @Override
    protected void process(ByteBuffer bb) {
      if (finished) {
        throw new IllegalStateException(
            "The behavior of calling any method after calling hash() is undefined.");
      }
      while (bb.remaining() >= 16) {
        crc0 = computeForWord(crc0);

                                        <la:textarea styleId="queries" property="queries" styleClass="form-control"
                                                     rows="5"/>
                                    </div>
                                </div>
                                <div class="form-group row">

 * will change the table.
 *
 * <p>All methods that modify the table are optional, and the views returned by the table may or may
 * not be modifiable. When modification isn't supported, those methods will throw an {@link
 * UnsupportedOperationException}.
 *
 * <h3>Implementations</h3>
 *
 * <ul>
 *   <li>{@link ImmutableTable}
 *   <li>{@link HashBasedTable}
 *   <li>{@link TreeBasedTable}
 *   <li>{@link ArrayTable}

                suggestHelper.deleteAllElevateWord(false);
                suggestHelper.storeAllElevateWords(false);
            } catch (final Exception e) {
                throw new FessSystemException("Failed to import elevate word data: fileName=" + form.elevateWordFile.getFileName(), e);
            }
        });
        saveInfo(messages -> messages.addSuccessUploadElevateWord(GLOBAL));