// Verify backward compatibility - Exception types still work
        String url = "http://example.com/test";
        String message = "Crawling error";

        // Test with IOException
        java.io.IOException ioException = new java.io.IOException("Network error");
        DataStoreCrawlingException exception1 = new DataStoreCrawlingException(url, message, ioException);
        assertTrue(exception1.getCause() instanceof java.io.IOException);

        String componentName = "testComponent";
        ContainerNotAvailableException exception = new ContainerNotAvailableException(componentName);

        assertEquals(componentName + " is not available.", exception.getMessage());
        assertNull(exception.getCause());
        assertEquals(componentName, exception.getComponentName());
    }

    @Test
    public void test_constructor_withComponentNameAndCause() {

        FessUserNotFoundException exception1 = new FessUserNotFoundException("user1");
        FessUserNotFoundException exception2 = new FessUserNotFoundException("user2");

        assertNotSame(exception1, exception2);
        assertFalse(exception1.getMessage().equals(exception2.getMessage()));
        assertEquals("User is not found: user1", exception1.getMessage());

        assertTrue(exception instanceof FessSystemException);
        assertTrue(exception instanceof RuntimeException);
        assertTrue(exception instanceof Exception);
        assertTrue(exception instanceof Throwable);

        // Should be runtime exception (unchecked), not an Error
        // CommandExecutionException extends RuntimeException, not Error

        String message = "Session expired";
        InvalidAccessTokenException exception = new InvalidAccessTokenException(type, message);

        assertTrue(exception instanceof FessSystemException);
        assertTrue(exception instanceof RuntimeException);
        assertTrue(exception instanceof Exception);
        assertTrue(exception instanceof Throwable);
    }

    @Test
    public void test_throwAndCatch() {

        // Test that different instances are not equal
        DictionaryExpiredException exception1 = new DictionaryExpiredException();
        DictionaryExpiredException exception2 = new DictionaryExpiredException();

        assertNotSame(exception1, exception2);
        assertFalse(exception1.equals(exception2));
        assertTrue(exception1.equals(exception1));
    }

    @Test
    public void test_hashCode() {

        assertTrue(exception.getMessage().contains(cause.getClass().getName()));
        assertTrue(exception.getMessage().contains("Cause exception"));
    }

    @Test
    public void test_constructor_withNullMessage() {
        // Test constructor with null message
        FessSystemException exception = new FessSystemException((String) null);

        assertNull(exception.getMessage());
        assertNull(exception.getCause());
    }

        SearchQueryException exception1 = new SearchQueryException("Exception 1");
        SearchQueryException exception2 = new SearchQueryException("Exception 2", new Exception("Cause 2"));
        SearchQueryException exception3 = new SearchQueryException(new Exception("Cause 3"));

        assertNotSame(exception1, exception2);
        assertNotSame(exception2, exception3);
        assertNotSame(exception1, exception3);

        @DisplayName("Should handle deeply nested exceptions")
        void testToStringWithNestedExceptions() {
            Exception innermost = new IOException("Innermost exception");
            Exception middle = new RuntimeException("Middle exception", innermost);
            Exception rootCause = new IllegalStateException("Outer exception", middle);
            TransportException exception = new TransportException("Transport failed", rootCause);

        assertThat(toSqlDateJdbcEscape(null), is(nullValue()));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testToSqlDate_EmptyString() throws Exception {
        assertThat(toSqlDateJdbcEscape(""), is(nullValue()));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testToSqlDate_ShortStyle() throws Exception {