Change in xpUpload:
    var out:javax.servlet.ServletOutputStream = response.getOutputStream();
    out.print(renamedFile.getAbsolutePath() + "#UPLOADEDFILE#" + serverFile.getAbsolutePath() );
    to
    response.setCharacterEncoding("UTF-8");
    var writer = response.getWriter(); 
    writer.write(renamedFile.getAbsolutePath() + "#UPLOADEDFILE#" + serverFile.getAbsolutePath() );