*
     * @param namePrefix the prefix that JAR file names should start with
     * @return an array of File objects representing matching JAR files, or empty array if none found
     */
    public static File[] getJarFiles(final String namePrefix) {
        final ServletContext context = LaServletContextUtil.getServletContext();
        if (context == null) {
            return new File[0];
        }

    @Test
    public void test_getJarFiles() {
        File[] jarFiles = ResourceUtil.getJarFiles("fess");
        assertNotNull(jarFiles);
        // Should return empty array when no servlet context available in test
        assertEquals(0, jarFiles.length);

        // Test with empty prefix
        jarFiles = ResourceUtil.getJarFiles("");
        assertNotNull(jarFiles);
        assertEquals(0, jarFiles.length);
    }