I have followed the steps of  building onap portal sdk web application using beijing sdk and after reaching the step of "Viewing your app" and login using demo/demo i got the following error 

Error: org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only

URI: /epsdk-app-os/login_external

Status code: 200

Note: i have attached the application log file and screen shot of the error