@Override
    public DescribeDBParameterGroupsResult describeDBParameterGroups() {
        return describeDBParameterGroups(new DescribeDBParameterGroupsRequest());
    }
<p>
Returns a list of <code>DBParameterGroup</code> descriptions. If a <code>DBParameterGroupName</code> is
specified, the list will contain only the description of the specified DB parameter group.
</p>

@param describeDBParameterGroupsRequest
@return Result of the DescribeDBParameterGroups operation returned by the service.
@throws DBParameterGroupNotFoundException
        <code>DBParameterGroupName</code> doesn't refer to an existing DB parameter group.
@sample AmazonRDS.DescribeDBParameterGroups
@see <a href="http://docs.aws.amazon.com/goto/WebAPI/rds-2014-10-31/DescribeDBParameterGroups" target="_top">AWS
     API Documentation</a>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/AmazonRDSClient.java