The benefit of raising an exception over returning a value will be more evident in the section about Dependencies and Security.

In this example, when the client requests an item by an ID that doesn't exist, raise an exception with a status code of `404`:

        // Execute
        corsHandlerFactory.add(originWithSlash, handlerWithSlash);
        corsHandlerFactory.add(originWithoutSlash, handlerWithoutSlash);

        // Verify - trailing slash matters
        assertEquals(handlerWithSlash, corsHandlerFactory.get(originWithSlash));
        assertEquals(handlerWithoutSlash, corsHandlerFactory.get(originWithoutSlash));
    }

// characters, as defined by [unicode.IsSpace], returning a slice of subslices of s or an
// empty slice if s contains only white space. Every element of the returned slice is
// non-empty. Unlike [Split], leading and trailing runs of white space characters
// are discarded.
func Fields(s []byte) [][]byte {
	// First count the fields.
	// This is an exact count if s is ASCII, otherwise it is an approximation.
	n := 0
	wasSpace := 1

fun String.canParseAsIpAddress(): Boolean = VERIFY_AS_IP_ADDRESS.matches(this)

/**
 * Returns true if the length is not valid for DNS (empty or greater than 253 characters), or if any
 * label is longer than 63 characters. Trailing dots are okay.
 */
internal fun String.containsInvalidLabelLengths(): Boolean {
  if (length !in 1..253) return true

  var labelStart = 0
  while (true) {
    val dot = indexOf('.', startIndex = labelStart)

    "output": "xn----xhn"
  },
  {
    "input": "-x.xn--zca",
    "output": "-x.xn--zca"
  },
  {
    "input": "-x.ß",
    "output": "-x.xn--zca"
  },
  {
    "comment": "Label with trailing hyphen",
    "input": "x-.xn--zca",
    "output": "x-.xn--zca"
  },
  {
    "input": "x-.ß",
    "output": "x-.xn--zca"
  },
  {
    "comment": "Empty labels",
    "input": "x..xn--zca",

        QueryBuilder queryBuilder = QueryBuilders.matchAllQuery();
        UpdateLabelJob returnedJob = updateLabelJob.query(queryBuilder);

        assertSame(updateLabelJob, returnedJob); // Method chaining
        assertEquals(queryBuilder, updateLabelJob.queryBuilder);
    }

    // Test query() method with null
    public void test_query_withNull() {
        updateLabelJob.query(null);

    }

    /**
     * Sets the query builder for filtering documents.
     *
     * @param queryBuilder the query builder to filter documents
     * @return this UpdateLabelJob instance for method chaining
     */
    public UpdateLabelJob query(final QueryBuilder queryBuilder) {
        this.queryBuilder = queryBuilder;
        return this;
    }

    }

    /**
     * Sets the expiration time for thumbnails.
     *
     * @param expiry the expiration time in milliseconds (must be positive)
     * @return this PurgeThumbnailJob instance for method chaining
     */
    public PurgeThumbnailJob expiry(final long expiry) {
        if (expiry > 0) {
            this.expiry = expiry;
        }
        return this;
    }

        } catch (Exception e) {
            fail("Should have caught as FessSystemException");
        }
    }

    public void test_exceptionChaining() {
        // Test that the exception can be used in exception chaining
        String username = "testuser";
        FessUserNotFoundException originalException = new FessUserNotFoundException(username);

        try {

### Always `raise` in Dependencies with `yield` and `except` { #always-raise-in-dependencies-with-yield-and-except }