Fix for „Internal Server Error“ on Scheduled Tasks in Spacewalk 2.6 / 2.7 / 2.8

Add this to /etc/rhn/rhn.conf:

hibernate.enable_lazy_load_no_trans=true

Then restart spacewalk services like so:

systemctl stop tomcat
systemctl stop taskomatic
systemctl stop rhn-search
systemctl start rhn-search
systemctl start taskomatic
systemctl start tomcat
spacewalk-service restart