hello every one,

I have installed the jasper_report module in the odoo11 version.
and I did as in version 8, I developed with jasper_studio a report that connects via jdbc and 
I did the test and it works well.
The problem is when I install the jrxml report in the odoo version 11 
I get the following error message:

  File "/home/hp/PycharmProjects/jasper_reports/report_xml.py", line 181, in render_jasper
    jasper = r.execute()
  File "/home/hp/PycharmProjects/jasper_reports/jasper_report.py", line 203, in execute
    sub_report_data_files)
  File "/home/hp/PycharmProjects/jasper_reports/jasper_report.py", line 291, in execute_report
    output_file, parameters)
  File "/home/hp/PycharmProjects/jasper_reports/JasperReports/jasper_server.py", line 119, in execute
    raise UserError(_('Report Error\n%s' % e))
odoo.exceptions.UserError: ("Report Error\n<Fault 0: 'Failed to invoke method execute in class com.nantic.jasperreports.JasperServer: java.lang.ClassNotFoundException: '>", '')
2019-03-22 11:02:40,717 23148 INFO DB werkzeug: 127.0.0.1 - - [22/Mar/2019 11:02:40] "POST /longpolling/poll HTTP/1.1" 200 -

Thanks in advance for all your help.
Regards,