* - Any character between 0x10000 and 0x10FFFF
     *
     * @param in the input string to be processed
     * @return a new string with invalid XML characters removed, or the original
     *         string if it is empty
     */
    public static String stripInvalidXMLCharacters(final String in) {
        if (StringUtil.isEmpty(in)) {
            return in;
        }

    public void test_throwAndCatchWithCause() {
        // Test throwing and catching the exception with cause
        String message = "Throw and catch with cause test";
        Throwable cause = new RuntimeException("Original error");

        try {
            throw new SearchEngineClientException(message, cause);
        } catch (SearchEngineClientException e) {
            assertEquals(message, e.getMessage());

        TestAbstractCIFSContext spyContext = new TestAbstractCIFSContext(mockCredentials) {
            @Override
            public boolean close() throws CIFSException {
                super.close(); // Call original close to set closeCalled
                throw new CIFSException("Test exception during close");
            }
        };

        // Simulate the shutdown hook being run
        spyContext.run();

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