CkFinder with Java with session issue?

    @Override
    public String getBaseUrl(HttpServletRequest request) {
        String userFolder = request.getSession(true).getAttribute("userFolder").toString();
        return "/personalUpload/" + userFolder + "/";
}

INFO: Session ID = "e54c5282b348300eaa98ef3014cf"   Reqest : /Demo.Upload/ckfinder/core/connector/java/connector.java
WARNING: PWC4011: Unable to set request character encoding to UTF-8 from context /Demo.Upload, because request parameters have already been read, or ServletRequest.getReader() has already been called

INFO: Session ID = "e6b68691c72b4527717f4d5daad9"   Reqest : /Demo.Upload/ckfinder/core/connector/java/connector.java
WARNING: PWC4011: Unable to set request character encoding to UTF-8 from context /Demo.Upload, because request parameters have already been read, or ServletRequest.getReader() has already been called
SEVERE: javax.servlet.ServletException: java.lang.NullPointerException