public String getUserId() {
        return this.userId;
    }
<p>
The ID of the client application user. Amazon Lex uses this to identify a user's conversation with your bot.
</p>

@return The ID of the client application user. Amazon Lex uses this to identify a user's conversation with your
        bot.
aws-java-sdk-lex/src/main/java/com/amazonaws/services/lexruntime/model/PutSessionRequest.java