public CreateDBInstanceRequest withEngine(String engine) {
        setEngine(engine);
        return this;
    }
<p>
The name of the database engine to be used for this instance.
</p>
<p>
Valid Values: <code>neptune</code>
</p>

@param engine
       The name of the database engine to be used for this instance.</p>
       <p>
       Valid Values: <code>neptune</code>
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-neptune/src/main/java/com/amazonaws/services/neptune/model/CreateDBInstanceRequest.java