This might have to do with an error in the SSL handshake:
PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Make sure both sides of the connection have valid SSL-certificaties.
Hi Fadil Muslun,
The retrieve of data throws a error, plse check whether the call rest service is configured properly and whether there exist a data and access to the user roles.
I hope it works.