-Replace old import statements for the new locations
-Mark the aggregate as @Aggregate to make it autowired through the
spring boot starter
-Move all command handlers/decision making functions to the top of the
file
-Rename the command handler to `handle` as a best practice for command
handlers
-Use @EventSourcingHandler i.o. @EventHandler as a best practice for
event handlers in Aggregates, as those only are used to 'source' the
aggregate
-Update test case according to latest standards
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