// Create a hook that simulates an exception scenario
        AtomicBoolean exceptionHandled = new AtomicBoolean(false);

        FessCurtainFinallyHook customHook = new FessCurtainFinallyHook() {
            @Override
            public void hook(final FwAssistantDirector assistantDirector) {
                try {
                    // Simulate a scenario where the method exists but invocation fails

    }

    // Test handling of processing exception
    public void test_execute_withProcessingException() {
        // Create a mock that returns 0 to simulate processing error
        SearchEngineClient errorClient = new SearchEngineClient() {
            @Override
            public long updateByQuery(String index,

                return false;
            }

            // Simulate thumbnail generation
            try {
                if (!outputFile.exists()) {
                    outputFile.createNewFile();
                }
                // Write some dummy content to simulate actual thumbnail
                Files.write(outputFile.toPath(), ("thumbnail-" + thumbnailId).getBytes());

        Exception exception = new Exception() {
            @Override
            public void printStackTrace(java.io.PrintWriter writer) {
                // Simulate a normal stack trace output
                writer.println("Special test exception");
                writer.flush();
            }
        };

        monitorTarget.appendException(buf, exception);

            // We can't easily test the static process method directly without full container setup
            // So we'll test the Options behavior separately
            assertNull(options.sessionId);

            // Simulate what process() does - generate default sessionId
            if (options.sessionId == null) {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");

        dataStore = new DataStore() {
            @Override
            public void store(DataConfig config, IndexUpdateCallback callback, DataStoreParams initParamMap) {
                // Simulate storing documents
                Map<String, Object> doc1 = new HashMap<>();
                doc1.put("id", "1");
                doc1.put("title", "Document 1");
                callback.store(initParamMap, doc1);

        // Test empty directory deletion logic
        File emptyDir = new File(tempDir, "empty");
        emptyDir.mkdirs();
        assertTrue(emptyDir.exists());

        // Simulate the behavior of postVisitDirectory - delete empty directories
        if (emptyDir.isDirectory() && emptyDir.list().length == 0) {
            emptyDir.delete();
        }

        assertFalse(emptyDir.exists());

            private long totalTime = 0;

            @Override
            public void store(DataStoreParams paramMap, Map<String, Object> dataMap) {
                try {
                    Thread.sleep(10); // Simulate processing time
                } catch (InterruptedException e) {
                    // Ignore
                }
                totalTime = System.currentTimeMillis() - startTime;
            }

        }
    }

    // Test property filter returning null simulation
    public void test_get_filterReturnsNull() {
        // The filter.null property is configured to simulate null filter behavior
        try {
            fessConfig.get("filter.null");
            fail("Should throw exception when property is not found");
        } catch (ConfigPropertyNotFoundException e) {

        @Override
        public Object evaluate(String template, Map<String, Object> paramMap) {
            if ("error".equals(template)) {
                // Simulate error by returning null
                return null;
            }
            return template;
        }
    }

    // Test helper class
    private static class TestUser {