public String getDBParameterGroupName() {
        return this.dBParameterGroupName;
    }
<p>
The name of the DB parameter group to apply to the DB instance. Changing this setting doesn't result in an
outage. The parameter group name itself is changed immediately, but the actual parameter changes are not applied
until you reboot the instance without failover. The db instance will NOT be rebooted automatically and the
parameter changes will NOT be applied during the next maintenance window.
</p>
<p>
Default: Uses existing setting
</p>
<p>
Constraints: The DB parameter group must be in the same DB parameter group family as this DB instance.
</p>

@return The name of the DB parameter group to apply to the DB instance. Changing this setting doesn't result in
        an outage. The parameter group name itself is changed immediately, but the actual parameter changes are
        not applied until you reboot the instance without failover. The db instance will NOT be rebooted
        automatically and the parameter changes will NOT be applied during the next maintenance window.</p>
        <p>
        Default: Uses existing setting
        </p>
        <p>
        Constraints: The DB parameter group must be in the same DB parameter group family as this DB instance.
aws-java-sdk-neptune/src/main/java/com/amazonaws/services/neptune/model/ModifyDBInstanceRequest.java