Sometimes, while checking the preview for any policy (Firewall, NAT, etc) will be stuck at "Calculating CLI and XML edit". But if we check the same in Job management, this will be failing with the error "javax.ejb.EJBTransactionRollbackException". This article explains how to fix such issues

This issue will occur when the Junos version between Primary and Secondary SRX is showing different in Security Director. But it is showing the same in the Network management platform.

WARNING:  EJBTransactionRollbackException  is a GENERIC message for any time a job has failed and aborted, an earlier log message (before this one) in jboss logs is the "real" error.  This KB does not capture the "real" message to look for for this workaround

• In this situation, we may see the Secondary SRX shows as active in WebUI.
• If yes, we need to delete the Primary SRX which is showing the old version in Security Director (This will not delete the IPsec VPN configurations since all services are assigned to Secondary SRX).
• Then discover the Primary SRX back. Post that the primary will be showing active in SD UI and preview will be working as expected