public void setSessionId(String sessionId) {
        this.sessionId = sessionId;
    }
<p>
The session ID associated with the user's visit. Your application generates the sessionId when a user first
visits your website or uses your application. Amazon Personalize uses the sessionId to associate events with the
user before they log in. For more information, see <a
href="https://docs.aws.amazon.com/personalize/latest/dg/recording-item-interaction-events.html">Recording item
interaction events</a>.
</p>

@param sessionId
       The session ID associated with the user's visit. Your application generates the sessionId when a user
       first visits your website or uses your application. Amazon Personalize uses the sessionId to associate
       events with the user before they log in. For more information, see <a
       href="https://docs.aws.amazon.com/personalize/latest/dg/recording-item-interaction-events.html">Recording
       item interaction events</a>.
aws-java-sdk-personalizeevents/src/main/java/com/amazonaws/services/personalizeevents/model/PutEventsRequest.java