} catch (Exception e) {
                exceptions[1] = e;
            }
        });

        // Start both threads
        threads[0].start();
        threads[1].start();

        // Wait for completion
        threads[0].join();
        threads[1].join();

        // Verify no exceptions occurred (the main goal is no ConcurrentModificationException)

     *
     * @return array of character codes to be treated as spaces
     */
    protected int[] getSpaceChars() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return fessConfig.getCrawlerDocumentSpaceCharsAsArray();
    }

    /**
     * Creates a digest (abbreviated summary) of document content.
     * Truncates and normalizes content to create a summary suitable for display.
     *

        maxRedirectCount = fessConfig.getIndexerDataMaxRedirectCountAsInteger();
    }

    /**
     * Creates a new fixed thread pool executor with the specified number of threads.
     *
     * @param nThreads the number of threads in the pool
     * @return a new ThreadPoolExecutor configured for this callback
     */
    protected ExecutorService newFixedThreadPool(final int nThreads) {

        super.setUp(testInfo);

        // Create a temporary test file
        testFile = File.createTempFile("test_stopwords", ".txt");
        testFile.deleteOnExit();

        // Write test data to file
        try (FileOutputStream fos = new FileOutputStream(testFile)) {
            fos.write(getTestContent().getBytes(StandardCharsets.UTF_8));
        }

        // Create a temporary project.properties file for SystemHelper

                    exceptions[index] = e;
                }
            });
        }

        // Start all threads
        for (Thread thread : threads) {
            thread.start();
        }

        // Wait for all threads to complete
        for (Thread thread : threads) {
            thread.join();
        }

        // Check all providers were created successfully

                }
            });
        }

        // Start all threads
        for (Thread thread : threads) {
            thread.start();
        }

        // Wait for all threads to complete
        for (Thread thread : threads) {
            thread.join(5000); // 5 second timeout
        }

        // Verify no errors occurred during concurrent execution

            });
            threads[i].start();
        }

        // Wait for all threads to complete
        for (Thread thread : threads) {
            try {
                thread.join();
            } catch (InterruptedException e) {
                fail("Thread interrupted: " + e.getMessage());
            }
        }

        // Verify all threads got the same instances

    /**
     * Creates a new role item.
     *
     * @param form the create form containing the new item data
     * @return HTML response redirecting to the list page after creation
     */
    @Execute
    @Secured({ ROLE })
    public HtmlResponse create(final CreateForm form) {
        verifyCrudMode(form.crudMode, CrudMode.CREATE, this::asListHtml);

    protected DictionaryManager dictionaryManager;

    /**
     * Creates a new DictionaryCreator with the specified pattern.
     *
     * @param pattern the regular expression pattern to match file paths
     */
    protected DictionaryCreator(final String pattern) {
        this.pattern = Pattern.compile(pattern);
    }

    /**
     * Creates a dictionary file for the given path and timestamp if it matches this creator's pattern.

    @Override
    protected void tearDown(TestInfo testInfo) throws Exception {
        ComponentUtil.setFessConfig(null);
        super.tearDown(testInfo);
    }

    /**
     * Test that setting search fields creates both array and Set.
     */
    @Test
    public void test_setSearchFields_createsSet() {
        String[] fields = { "field1", "field2", "field3" };
        queryFieldConfig.setSearchFields(fields);