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

@param userId
       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