PubNub MCP Server

# Channel Groups API – Java SDK > PubNub Java SDK v9.0.0 merges Java & Kotlin codebases, introduces a new client constructor, and changes async callbacks/status events. Applications built with <9.0.0 **must** follow the migration guide. Channel Groups bundle many channels under one name. • You can **subscribe**, **not publish**, to a group. • Every operation below requires the **Stream Controller** add-on. --- ## Add channels to a channel group Maximum 200 channels per call. ```java this.pubnub.addChannelsToChannelGroup() .channelGroup(String) .channels(Array) ``` Parameter | Type | Description --------- | ---- | ----------- channelGroup | String | Target group channels | Array<String> | Channels to add async | Consumer<Result<PNChannelGroupsAddChannelResult>> | Completion callback Sample: ``` ` ` ``` Response: no payload—use `result.isFailure()` or `result.onFailure(e -> { ... })`. --- ## List channels in a channel group ```java pubnub.listChannelsForChannelGroup() .channelGroup(String) .async(result -> { /* check result */ }); ``` Parameter | Type | Description --------- | ---- | ----------- channelGroup | String | Group to query async | Consumer<Result<PNChannelGroupsAllChannelsResult>> | Completion callback Sample: ``` ` ` ``` Return object: `PNChannelGroupsAllChannelsResult` • `getChannels()` → `List<String>` --- ## Remove channels from a channel group ```java pubnub.removeChannelsFromChannelGroup() .channelGroup(String) .channels(Array) ``` Parameter | Type | Description --------- | ---- | ----------- channels | Array<String> | Channels to remove channelGroup | String | Target group async | Consumer<Result<PNChannelGroupsRemoveChannelResult>> | Completion callback Sample: ``` ` ` ``` Response: no payload—check `result.isFailure()` / `onFailure`. --- ## Delete a channel group ```java pubnub.deleteChannelGroup() .channelGroup(String) ``` Parameter | Type | Description --------- | ---- | ----------- channelGroup | String | Group to delete async | Consumer<Result<PNChannelGroupsDeleteGroupResult>> | Completion callback Sample: ``` ` ` ``` Response: no payload—check `result.isFailure()` / `onFailure`. _Last updated: Jul 15 2025_