--- name: azure-communication-chat-java description: "Build real-time chat applications with thread management, messaging, participants, and read receipts." risk: unknown source: community date_added: "2026-02-27" --- # Azure Communication Chat (Java) Build real-time chat applications with thread management, messaging, participants, and read receipts. ## Installation ```xml com.azure azure-communication-chat 1.6.0 ``` ## Client Creation ```java import com.azure.communication.chat.ChatClient; import com.azure.communication.chat.ChatClientBuilder; import com.azure.communication.chat.ChatThreadClient; import com.azure.communication.common.CommunicationTokenCredential; // ChatClient requires a CommunicationTokenCredential (user access token) String endpoint = "https://.communication.azure.com"; String userAccessToken = ""; CommunicationTokenCredential credential = new CommunicationTokenCredential(userAccessToken); ChatClient chatClient = new ChatClientBuilder() .endpoint(endpoint) .credential(credential) .buildClient(); // Async client ChatAsyncClient chatAsyncClient = new ChatClientBuilder() .endpoint(endpoint) .credential(credential) .buildAsyncClient(); ``` ## Key Concepts | Class | Purpose | |-------|---------| | `ChatClient` | Create/delete chat threads, get thread clients | | `ChatThreadClient` | Operations within a thread (messages, participants, receipts) | | `ChatParticipant` | User in a chat thread with display name | | `ChatMessage` | Message content, type, sender info, timestamps | | `ChatMessageReadReceipt` | Read receipt tracking per participant | ## Create Chat Thread ```java import com.azure.communication.chat.models.*; import com.azure.communication.common.CommunicationUserIdentifier; import java.util.ArrayList; import java.util.List; // Define participants List participants = new ArrayList<>(); ChatParticipant participant1 = new ChatParticipant() .setCommunicationIdentifier(new CommunicationUserIdentifier("")) .setDisplayName("Alice"); ChatParticipant participant2 = new ChatParticipant() .setCommunicationIdentifier(new CommunicationUserIdentifier("")) .setDisplayName("Bob"); participants.add(participant1); participants.add(participant2); // Create thread CreateChatThreadOptions options = new CreateChatThreadOptions("Project Discussion") .setParticipants(participants); CreateChatThreadResult result = chatClient.createChatThread(options); String threadId = result.getChatThread().getId(); // Get thread client for operations ChatThreadClient threadClient = chatClient.getChatThreadClient(threadId); ``` ## Send Messages ```java // Send text message SendChatMessageOptions messageOptions = new SendChatMessageOptions() .setContent("Hello, team!") .setSenderDisplayName("Alice") .setType(ChatMessageType.TEXT); SendChatMessageResult sendResult = threadClient.sendMessage(messageOptions); String messageId = sendResult.getId(); // Send HTML message SendChatMessageOptions htmlOptions = new SendChatMessageOptions() .setContent("Important: Meeting at 3pm") .setType(ChatMessageType.HTML); threadClient.sendMessage(htmlOptions); ``` ## Get Messages ```java import com.azure.core.util.paging.PagedIterable; // List all messages PagedIterable messages = threadClient.listMessages(); for (ChatMessage message : messages) { System.out.println("ID: " + message.getId()); System.out.println("Type: " + message.getType()); System.out.println("Content: " + message.getContent().getMessage()); System.out.println("Sender: " + message.getSenderDisplayName()); System.out.println("Created: " + message.getCreatedOn()); // Check if edited or deleted if (message.getEditedOn() != null) { System.out.println("Edited: " + message.getEditedOn()); } if (message.getDeletedOn() != null) { System.out.println("Deleted: " + message.getDeletedOn()); } } // Get specific message ChatMessage message = threadClient.getMessage(messageId); ``` ## Update and Delete Messages ```java // Update message UpdateChatMessageOptions updateOptions = new UpdateChatMessageOptions() .setContent("Updated message content"); threadClient.updateMessage(messageId, updateOptions); // Delete message threadClient.deleteMessage(messageId); ``` ## Manage Participants ```java // List participants PagedIterable participants = threadClient.listParticipants(); for (ChatParticipant participant : participants) { CommunicationUserIdentifier user = (CommunicationUserIdentifier) participant.getCommunicationIdentifier(); System.out.println("User: " + user.getId()); System.out.println("Display Name: " + participant.getDisplayName()); } // Add participants List newParticipants = new ArrayList<>(); newParticipants.add(new ChatParticipant() .setCommunicationIdentifier(new CommunicationUserIdentifier("")) .setDisplayName("Charlie") .setShareHistoryTime(OffsetDateTime.now().minusDays(7))); // Share last 7 days threadClient.addParticipants(newParticipants); // Remove participant CommunicationUserIdentifier userToRemove = new CommunicationUserIdentifier(""); threadClient.removeParticipant(userToRemove); ``` ## Read Receipts ```java // Send read receipt threadClient.sendReadReceipt(messageId); // Get read receipts PagedIterable receipts = threadClient.listReadReceipts(); for (ChatMessageReadReceipt receipt : receipts) { System.out.println("Message ID: " + receipt.getChatMessageId()); System.out.println("Read by: " + receipt.getSenderCommunicationIdentifier()); System.out.println("Read at: " + receipt.getReadOn()); } ``` ## Typing Notifications ```java import com.azure.communication.chat.models.TypingNotificationOptions; // Send typing notification TypingNotificationOptions typingOptions = new TypingNotificationOptions() .setSenderDisplayName("Alice"); threadClient.sendTypingNotificationWithResponse(typingOptions, Context.NONE); // Simple typing notification threadClient.sendTypingNotification(); ``` ## Thread Operations ```java // Get thread properties ChatThreadProperties properties = threadClient.getProperties(); System.out.println("Topic: " + properties.getTopic()); System.out.println("Created: " + properties.getCreatedOn()); // Update topic threadClient.updateTopic("New Project Discussion Topic"); // Delete thread chatClient.deleteChatThread(threadId); ``` ## List Threads ```java // List all chat threads for the user PagedIterable threads = chatClient.listChatThreads(); for (ChatThreadItem thread : threads) { System.out.println("Thread ID: " + thread.getId()); System.out.println("Topic: " + thread.getTopic()); System.out.println("Last message: " + thread.getLastMessageReceivedOn()); } ``` ## Pagination ```java import com.azure.core.http.rest.PagedResponse; // Paginate through messages int maxPageSize = 10; ListChatMessagesOptions listOptions = new ListChatMessagesOptions() .setMaxPageSize(maxPageSize); PagedIterable pagedMessages = threadClient.listMessages(listOptions); pagedMessages.iterableByPage().forEach(page -> { System.out.println("Page status code: " + page.getStatusCode()); page.getElements().forEach(msg -> System.out.println("Message: " + msg.getContent().getMessage())); }); ``` ## Error Handling ```java import com.azure.core.exception.HttpResponseException; try { threadClient.sendMessage(messageOptions); } catch (HttpResponseException e) { switch (e.getResponse().getStatusCode()) { case 401: System.out.println("Unauthorized - check token"); break; case 403: System.out.println("Forbidden - user not in thread"); break; case 404: System.out.println("Thread not found"); break; default: System.out.println("Error: " + e.getMessage()); } } ``` ## Message Types | Type | Description | |------|-------------| | `TEXT` | Regular chat message | | `HTML` | HTML-formatted message | | `TOPIC_UPDATED` | System message - topic changed | | `PARTICIPANT_ADDED` | System message - participant joined | | `PARTICIPANT_REMOVED` | System message - participant left | ## Environment Variables ```bash AZURE_COMMUNICATION_ENDPOINT=https://.communication.azure.com AZURE_COMMUNICATION_USER_TOKEN= ``` ## Best Practices 1. **Token Management** - User tokens expire; implement refresh logic with `CommunicationTokenRefreshOptions` 2. **Pagination** - Use `listMessages(options)` with `maxPageSize` for large threads 3. **Share History** - Set `shareHistoryTime` when adding participants to control message visibility 4. **Message Types** - Filter system messages (`PARTICIPANT_ADDED`, etc.) from user messages 5. **Read Receipts** - Send receipts only when messages are actually viewed by user ## Trigger Phrases - "chat application Java", "real-time messaging Java" - "chat thread", "chat participants", "chat messages" - "read receipts", "typing notifications" - "Azure Communication Services chat" ## When to Use This skill is applicable to execute the workflow or actions described in the overview. ## Limitations - Use this skill only when the task clearly matches the scope described above. - Do not treat the output as a substitute for environment-specific validation, testing, or expert review. - Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

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