public Builder startAt(String startAt) {
            this.startAt = startAt;
            return this;
        }
REQUIRED. Name of the state to start execution at. Must match a state name provided via {@link #state(String,
State.Builder)}.

@param startAt Name of starting state.
@return This object for method chaining.
aws-java-sdk-stepfunctions/src/main/java/com/amazonaws/services/stepfunctions/builder/StateMachine.java