Tigase XMPP Server has a utility that can be called using upgrade-config that will update your old init.properties file and create a new file using DSL.
./scripts/tigase.sh upgrade-config etc/tigase.conf
When everything is ready it will printout following information
============================================================================= Configuration file etc/init.properties was converted to DSL format. Previous version of a configuration file was saved at etc/init.properties.old =============================================================================
