Type Parameters:: ID - the type of aggregate id; EVENT_TYPE - the type of event; AGGREGATE_TYPE - the type of aggregate; AGGREGATE_STATE - the type of the aggregate-state

public interface WithState<ID,EVENT_TYPE,AGGREGATE_TYPE extends AggregateRoot<ID,EVENT_TYPE,AGGREGATE_TYPE>,AGGREGATE_STATE extends AggregateState<ID,EVENT_TYPE,AGGREGATE_TYPE>>

Marker interface that indicates that all state and all EventHandler annotated methods will be hosted with the AggregateState object. The state object will be maintained by the AggregateRoot.
You can use the AggregateRoot.state() or AggregateRoot.state(Class) methodst o access the concrete State object.

See Also:

Interface WithState<ID,EVENT_TYPE,AGGREGATE_TYPE extends AggregateRoot<ID,EVENT_TYPE,AGGREGATE_TYPE>,AGGREGATE_STATE extends AggregateState<ID,EVENT_TYPE,AGGREGATE_TYPE>>