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() );