public abstract class AdminClient implements AutoCloseable {
 	
	public abstract DescribeGroupsResultDescribeConsumerGroupsResult describeGroupsdescribeConsumerGroups(Collection<String> groupIds, DescribeGroupsOptions DescribeConsumerGroupsOptions options);
 
	public DescribeGroupsResultDescribeConsumerGroupsResult describeGroupsdescribeConsumerGroups(Collection<String> groupIds) {
    	return describeGroupsdescribeConsumerGroups(groupIds, new DescribeGroupsOptionsDescribeConsumerGroupsOptions());
	}
 
    public abstract ListGroupsResultListConsumerGroupsResult listGroupslistConsumerGroups(ListGroupsOptionsListConsumerGroupsOptions options);

    public ListGroupsResultListConsumerGroupsResult listGroupslistConsumerGroups() {
        return listGroups(new ListGroupsOptions());
    }

    public abstract ListGroupsResult listConsumerGroups(ListGroupsOptions options); //filtering groups by ConsumerProtocol.PROTOCOL_TYPE
    

    public ListGroupsResult listConsumerGroups() {
        return listGroups(new ListGroupsOptionsnew ListConsumerGroupsOptions());
    }
    
    public ListGroupOffsetsResultListConsumerGroupOffsetsResult listGroupOffsetslistConsumerGroupOffsets(String groupId, ListGroupsOptionsListConsumerGroupsOptions options);
 
    public ListGroupOffsetsResultListConsumerGroupOffsetsResult listGroupOffsetslistConsumerGroupOffsets(String groupId) {
        return listGroupOffsetslistConsumerGroupOffsets(new ListGroupOffsetsOptionsListConsumerGroupOffsetsOptions());
    }
}
 
public class DescribeGroupOptionsDescribeConsumerGroupOptions extends AbstractOptions<DescribeGroupOptions>AbstractOptions<DescribeConsumerGroupOptions> {
}
 
public class DescribeGroupResultDescribeConsumerGroupResult {
    private final Map<String, KafkaFuture<GroupDescription>>KafkaFuture<ConsumerGroupDescription>> futures;
...
}
 
public class GroupDescriptionConsumerGroupDescription {
    private final String groupId;
    private final Stringboolean protocolTypeisSimpleConsumerGroup;
    private final List<MemberDescription> members;
    private final String partitionAssignor;
}
 
public class MemberDescription {
    private final String consumerId;
    private final String clientId;
    private final String host;
    private final MemberAssignment assignment;
}
 
public class MemberAssignment {
    private final List<TopicPartition> assignmenttopicPartitions;
}

public class ListGroupsOptionsListConsumerGroupsOptions extends AbstractOptions<ListGroupsOptions>AbstractOptions<ListConsumerGroupsOptions> {
}

public class ListGroupsResultListConsumerGroupsResult {
    final KafkaFuture<Map<String, GroupListing>> future;

    //...
}
 
public class GroupListingConsumerGroupListing {
    private final Stringboolean nameisSimpleConsumerGroup;
    private final String protocolType;
}
 
public class ListGroupOffsetsOptionsListConsumerGroupOffsetsOptions extends AbstractOptions<ListGroupsOptions>AbstractOptions<ListConsumerGroupsOptions> {
}
 
public class ListGroupOffsetsResultListConsumerGroupOffsetsResult {
    final KafkaFuture<Map<TopicPartition, OffsetAndMetadata>> future;
 
    //...
}