public PublishVersionResult withHandler(String handler) {
        setHandler(handler);
        return this;
    }
<p>
The function that Lambda calls to begin running your function.
</p>

@param handler
       The function that Lambda calls to begin running your function.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-lambda/src/main/java/com/amazonaws/services/lambda/model/PublishVersionResult.java