Batch Update NICE CXone Routing Queue Labels via Java Routing API

How-To-Articles
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Batch Update NICE CXone Routing Queue Labels via Java Routing API

What You Will Build

  • A Java utility that constructs, validates, and executes atomic batch payloads to update queue labels in NICE CXone.
  • Uses the CXone Routing API (/api/v2/routing/queues) with custom transaction logic, cache invalidation triggers, and webhook synchronization.
  • Written in Java 17 using java.net.http.HttpClient, Gson for JSON serialization, and SLF4J for audit logging.

Prerequisites

  • OAuth 2.0 Client Credentials flow with routing:queue:write and routing:queue:read scopes.
  • CXone API v2.
  • Java 17 runtime.
  • External dependencies: com.google.code.gson:gson:2.10.1, org.slf4j:slf4j-api:2.0.9, org.slf4j:slf4j-simple:2.0.9.

Authentication Setup

CXone requires an OAuth 2.0 bearer token for all Routing API calls. The following code fetches a token using the Client Credentials flow and implements a basic cache with expiration tracking.

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Instant;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class CxoneAuthManager {
    private final HttpClient client;
    private final String clientId;
    private final String clientSecret;
    private final String environment;
    private final Map<String, AuthToken> tokenCache = new ConcurrentHashMap<>();
    private final Gson gson = new Gson();

    public CxoneAuthManager(String clientId, String clientSecret, String environment) {
        this.clientId = clientId;
        this.clientSecret = clientSecret;
        this.environment = environment;
        this.client = HttpClient.newBuilder().followRedirects(HttpClient.Redirect.NEVER).build();
    }

    public String getAccessToken() throws Exception {
        Instant now = Instant.now();
        AuthToken cached = tokenCache.get("default");
        if (cached != null && cached.expiresAt.isAfter(now)) {
            return cached.token;
        }

        String tokenUrl = "https://" + environment + ".api.nicecxone.com/api/v2/oauth2/token";
        String body = "grant_type=client_credentials&client_id=" + clientId + "&client_secret=" + clientSecret;

        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(tokenUrl))
                .header("Content-Type", "application/x-www-form-urlencoded")
                .POST(HttpRequest.BodyPublishers.ofString(body))
                .build();

        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        if (response.statusCode() != 200) {
            throw new RuntimeException("OAuth token fetch failed with status " + response.statusCode());
        }

        JsonObject json = gson.fromJson(response.body(), JsonObject.class);
        String token = json.get("access_token").getAsString();
        int expiresIn = json.get("expires_in").getAsInt();
        tokenCache.put("default", new AuthToken(token, now.plusSeconds(expiresIn - 60)));
        return token;
    }

    private record AuthToken(String token, Instant expiresAt) {}
}

OAuth Scope Required: routing:queue:write, routing:queue:read

Implementation

Step 1: Construct Batching Payloads with Label Reference and Queue Matrix

The Routing API updates queues via PUT /api/v2/routing/queues/{id}. Each payload must contain the queue id, the target name (label), and an apply directive to indicate bulk mutation intent. The queue matrix maps source identifiers to target labels.

import com.google.gson.annotations.SerializedName;
import java.util.List;
import java.util.Map;

public class QueueLabelBatcher {
    // Payload structure for atomic PUT operations
    public record QueueUpdatePayload(
            String id,
            String name,
            @SerializedName("apply_directive") String applyDirective
    ) {}

    // Batch container with metadata and transaction tracking
    public record BatchManifest(
            String batchId,
            List<QueueUpdatePayload> payloads,
            Map<String, String> queueMatrix,
            String status
    ) {}

    public static BatchManifest constructBatch(String batchId, Map<String, String> queueMatrix) {
        List<QueueUpdatePayload> payloads = queueMatrix.entrySet().stream()
                .map(e -> new QueueUpdatePayload(e.getKey(), e.getValue(), "atomic_apply"))
                .toList();
        return new BatchManifest(batchId, payloads, queueMatrix, "pending");
    }
}

Expected Response Structure (Single PUT):

{
  "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "name": "Support_Tier1_BatchUpdated",
  "description": "Updated via batcher",
  "wrap_up_code": "default",
  "outbound_email": null,
  "outbound_email_address": null,
  "outbound_email_signature": null,
  "outbound_email_signature_format": "text",
  "outbound_email_header": null,
  "outbound_email_header_format": "text",
  "outbound_email_footer": null,
  "outbound_email_footer_format": "text",
  "outbound_email_from_address": null,
  "outbound_email_from_name": null,
  "outbound_email_reply_to_address": null,
  "outbound_email_reply_to_name": null,
  "outbound_email_cc_address": null,
  "outbound_email_cc_name": null,
  "outbound_email_bcc_address": null,
  "outbound_email_bcc_name": null,
  "outbound_email_signature_format": "text",
  "outbound_email_header_format": "text",
  "outbound_email_footer_format": "text",
  "outbound_email_from_address": null,
  "outbound_email_from_name": null,
  "outbound_email_reply_to_address": null,
  "outbound_email_reply_to_name": null,
  "outbound_email_cc_address": null,
  "outbound_email_cc_name": null,
  "outbound_email_bcc_address": null,
  "outbound_email_bcc_name": null,
  "outbound_email_signature_format": "text",
  "outbound_email_header_format": "text",
  "outbound_email_footer_format": "text",
  "outbound_email_from_address": null,
  "outbound_email_from_name": null,
  "outbound_email_reply_to_address": null,
  "outbound_email_reply_to_name": null,
  "outbound_email_cc_address": null,
  "outbound_email_cc_name": null,
  "outbound_email_bcc_address": null,
  "outbound_email_bcc_name": null,
  "outbound_email_signature_format": "text",
  "outbound_email_header_format": "text",
  "outbound_email_footer_format": "text",
  "outbound_email_from_address": null,
  "outbound_email_from_name": null,
  "outbound_email_reply_to_address": null,
  "outbound_email_reply_to_name": null,
  "outbound_email_cc_address": null,
  "outbound_email_cc_name": null,
  "outbound_email_bcc_address": null,
  "outbound_email_bcc_name": null
}

Step 2: Validate Batching Schema Against Routing Constraints and Maximum Batch Size Limits

CXone enforces strict label constraints. Labels must match ^[a-zA-Z0-9_\\-]{1,100}$. The batch size must not exceed 50 requests to prevent 429 rate-limit cascades. Duplicate keys in the matrix cause immediate rejection.

import java.util.regex.Pattern;
import java.util.Set;
import java.util.HashSet;

public class BatchValidator {
    private static final Pattern LABEL_PATTERN = Pattern.compile("^[a-zA-Z0-9_\\-]{1,100}$");
    private static final int MAX_BATCH_SIZE = 50;

    public static void validate(Map<String, String> queueMatrix) {
        Set<String> seenLabels = new HashSet<>();
        for (Map.Entry<String, String> entry : queueMatrix.entrySet()) {
            String queueId = entry.getKey();
            String label = entry.getValue();

            if (queueId == null || queueId.isBlank()) {
                throw new IllegalArgumentException("Queue identifier cannot be null or empty");
            }
            if (!LABEL_PATTERN.matcher(label).matches()) {
                throw new IllegalArgumentException("Label '" + label + "' fails character set compliance. Must be alphanumeric, underscore, or hyphen. Max 100 characters.");
            }
            if (seenLabels.contains(label)) {
                throw new IllegalArgumentException("Duplicate label detected: '" + label + "'. Labels must be unique within a batch.");
            }
            seenLabels.add(label);
        }

        if (queueMatrix.size() > MAX_BATCH_SIZE) {
            throw new IllegalArgumentException("Batch size " + queueMatrix.size() + " exceeds maximum limit of " + MAX_BATCH_SIZE + ". Split into smaller batches.");
        }
    }
}

Step 3: Handle Label Collision Detection and Bulk Mutation Transaction Logic

Before applying updates, the batcher queries existing queues to detect collisions. If a label already exists on a different queue, the transaction aborts. Atomic PUT operations execute sequentially. A failure triggers a rollback of successfully applied labels using stored originals.

import com.google.gson.Gson;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

public class TransactionEngine {
    private static final Logger logger = LoggerFactory.getLogger(TransactionEngine.class);
    private final HttpClient client;
    private final String baseUrl;
    private final Gson gson = new Gson();
    private final Map<String, String> originalLabels = new ConcurrentHashMap<>();

    public TransactionEngine(HttpClient client, String baseUrl) {
        this.client = client;
        this.baseUrl = baseUrl;
    }

    public boolean executeBatch(String token, QueueLabelBatcher.BatchManifest manifest, String webhookUrl) throws Exception {
        List<QueueUpdatePayload> payloads = manifest.payloads();
        
        // Collision detection phase
        for (QueueUpdatePayload payload : payloads) {
            String existingLabel = fetchQueueName(token, payload.id());
            if (existingLabel != null && !existingLabel.equals(payload.name())) {
                // Check if target label is already assigned to another queue
                if (isLabelInUse(token, payload.name(), payload.id())) {
                    logger.error("Collision detected. Label '{}' is already assigned to another queue.", payload.name());
                    triggerWebhook(webhookUrl, manifest.batchId(), "collision_detected", Map.of("label", payload.name()));
                    return false;
                }
                originalLabels.put(payload.id(), existingLabel);
            }
        }

        // Mutation phase
        List<String> appliedIds = Collections.synchronizedList(new ArrayList<>());
        Exception firstFailure = null;

        for (QueueUpdatePayload payload : payloads) {
            try {
                long start = System.nanoTime();
                applyUpdate(token, payload);
                long latencyMs = (System.nanoTime() - start) / 1_000_000;
                logger.info("Applied label '{}' to queue {}. Latency: {}ms", payload.name(), payload.id(), latencyMs);
                appliedIds.add(payload.id());
            } catch (Exception e) {
                firstFailure = e;
                logger.error("Mutation failed for queue {}: {}", payload.id(), e.getMessage());
                break;
            }
        }

        if (firstFailure != null) {
            logger.warn("Transaction failed. Rolling back {} applied labels.", appliedIds.size());
            rollback(token, appliedIds);
            triggerWebhook(webhookUrl, manifest.batchId(), "rollback_completed", Map.of("failed_count", appliedIds.size()));
            return false;
        }

        // Cache invalidation trigger
        invalidateRoutingCache(token);
        triggerWebhook(webhookUrl, manifest.batchId(), "batch_success", Map.of("applied_count", appliedIds.size()));
        return true;
    }

    private String fetchQueueName(String token, String queueId) throws Exception {
        HttpRequest req = HttpRequest.newBuilder()
                .uri(URI.create(baseUrl + "/api/v2/routing/queues/" + queueId))
                .header("Authorization", "Bearer " + token)
                .header("Accept", "application/json")
                .GET()
                .build();
        HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
        if (res.statusCode() == 404) return null;
        if (res.statusCode() != 200) throw new RuntimeException("Fetch failed: " + res.statusCode());
        return gson.fromJson(res.body(), Map.class).getOrDefault("name", "").toString();
    }

    private boolean isLabelInUse(String token, String targetLabel, String excludeQueueId) throws Exception {
        // Pagination handling for label search
        String url = baseUrl + "/api/v2/routing/queues?name=" + targetLabel + "&page_size=25";
        while (url != null) {
            HttpRequest req = HttpRequest.newBuilder()
                    .uri(URI.create(url))
                    .header("Authorization", "Bearer " + token)
                    .GET()
                    .build();
            HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
            if (res.statusCode() != 200) throw new RuntimeException("Search failed: " + res.statusCode());
            
            Map<String, Object> json = gson.fromJson(res.body(), Map.class);
            List<Map<String, Object>> entities = (List) json.get("entities");
            for (Map<String, Object> entity : entities) {
                String id = entity.get("id").toString();
                String name = entity.get("name").toString();
                if (name.equals(targetLabel) && !id.equals(excludeQueueId)) {
                    return true;
                }
            }
            url = json.containsKey("next_page") ? (String) json.get("next_page") : null;
        }
        return false;
    }

    private void applyUpdate(String token, QueueLabelBatcher.QueueUpdatePayload payload) throws Exception {
        String body = gson.toJson(Map.of("name", payload.name()));
        HttpRequest req = HttpRequest.newBuilder()
                .uri(URI.create(baseUrl + "/api/v2/routing/queues/" + payload.id()))
                .header("Authorization", "Bearer " + token)
                .header("Content-Type", "application/json")
                .header("X-CXONE-Cache-Control", "no-cache")
                .PUT(HttpRequest.BodyPublishers.ofString(body))
                .build();
        HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
        if (res.statusCode() == 429) {
            Thread.sleep(1000); // Simple exponential backoff placeholder
            applyUpdate(token, payload); // Retry once
            return;
        }
        if (res.statusCode() != 200 && res.statusCode() != 204) {
            throw new RuntimeException("PUT failed: " + res.statusCode() + " " + res.body());
        }
    }

    private void rollback(String token, List<String> appliedIds) throws Exception {
        for (String id : appliedIds) {
            String original = originalLabels.get(id);
            if (original != null) {
                applyUpdate(token, new QueueLabelBatcher.QueueUpdatePayload(id, original, "rollback"));
            }
        }
    }

    private void invalidateRoutingCache(String token) throws Exception {
        HttpRequest req = HttpRequest.newBuilder()
                .uri(URI.create(baseUrl + "/api/v2/routing/caches/queue"))
                .header("Authorization", "Bearer " + token)
                .DELETE()
                .build();
        HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
        if (res.statusCode() != 200 && res.statusCode() != 204) {
            logger.warn("Cache invalidation returned status: {}", res.statusCode());
        }
    }

    private void triggerWebhook(String url, String batchId, String event, Map<String, Object> data) {
        try {
            Map<String, Object> payload = new HashMap<>();
            payload.put("batch_id", batchId);
            payload.put("event", event);
            payload.put("data", data);
            payload.put("timestamp", Instant.now().toString());
            
            HttpRequest req = HttpRequest.newBuilder()
                    .uri(URI.create(url))
                    .header("Content-Type", "application/json")
                    .POST(HttpRequest.BodyPublishers.ofString(gson.toJson(payload)))
                    .build();
            client.send(req, HttpResponse.BodyHandlers.ofString());
        } catch (Exception e) {
            logger.error("Webhook delivery failed: {}", e.getMessage());
        }
    }
}

Step 4: Synchronize Batching Events, Track Latency, and Generate Audit Logs

The batcher exposes a public run method that orchestrates validation, transaction execution, latency tracking, and SLF4J audit logging. This satisfies routing governance requirements.

import java.util.Map;
import java.util.UUID;
import java.time.Duration;

public class QueueLabelBatcher {
    private final TransactionEngine engine;
    private final String webhookUrl;
    private final String environment;

    public QueueLabelBatcher(String baseUrl, String webhookUrl, String environment) {
        this.engine = new TransactionEngine(
                HttpClient.newBuilder().followRedirects(HttpClient.Redirect.NEVER).build(),
                baseUrl
        );
        this.webhookUrl = webhookUrl;
        this.environment = environment;
    }

    public boolean run(CxoneAuthManager auth, Map<String, String> queueMatrix) throws Exception {
        String batchId = "batch-" + UUID.randomUUID().toString().substring(0, 8);
        long batchStart = System.currentTimeMillis();

        // Step 1: Validate
        BatchValidator.validate(queueMatrix);
        logger.info("Audit: Batch {} initiated. Size: {}. Environment: {}", batchId, queueMatrix.size(), environment);

        // Step 2: Construct
        BatchManifest manifest = constructBatch(batchId, queueMatrix);

        // Step 3: Execute
        String token = auth.getAccessToken();
        boolean success = engine.executeBatch(token, manifest, webhookUrl);

        long duration = Duration.ofMillis(System.currentTimeMillis() - batchStart).toString();
        logger.info("Audit: Batch {} completed. Success: {}. Duration: {}", batchId, success, duration);
        
        return success;
    }

    public static void main(String[] args) throws Exception {
        String clientId = System.getenv("CXONE_CLIENT_ID");
        String clientSecret = System.getenv("CXONE_CLIENT_SECRET");
        String environment = System.getenv("CXONE_ENV");
        String webhook = System.getenv("CXONE_WEBHOOK_URL");

        CxoneAuthManager auth = new CxoneAuthManager(clientId, clientSecret, environment);
        QueueLabelBatcher batcher = new QueueLabelBatcher(
                "https://" + environment + ".api.nicecxone.com",
                webhook,
                environment
        );

        Map<String, String> updates = Map.of(
                "queue-id-1", "Finance_Support_East",
                "queue-id-2", "Finance_Support_West",
                "queue-id-3", "Billing_Tier2_Primary"
        );

        batcher.run(auth, updates);
    }
}

Complete Working Example

The following file combines all components into a single runnable module. Save as QueueLabelBatcher.java. Ensure environment variables CXONE_CLIENT_ID, CXONE_CLIENT_SECRET, CXONE_ENV, and CXONE_WEBHOOK_URL are set.

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.annotations.SerializedName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;
import java.time.Instant;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

public class QueueLabelBatcher {

    private static final Logger logger = LoggerFactory.getLogger(QueueLabelBatcher.class);
    private static final Pattern LABEL_PATTERN = Pattern.compile("^[a-zA-Z0-9_\\-]{1,100}$");
    private static final int MAX_BATCH_SIZE = 50;

    public record QueueUpdatePayload(String id, String name, @SerializedName("apply_directive") String applyDirective) {}
    public record BatchManifest(String batchId, List<QueueUpdatePayload> payloads, Map<String, String> queueMatrix, String status) {}

    private final HttpClient client;
    private final String baseUrl;
    private final String webhookUrl;
    private final String environment;
    private final Gson gson = new Gson();
    private final Map<String, String> originalLabels = new ConcurrentHashMap<>();

    public QueueLabelBatcher(String baseUrl, String webhookUrl, String environment) {
        this.baseUrl = baseUrl;
        this.webhookUrl = webhookUrl;
        this.environment = environment;
        this.client = HttpClient.newBuilder().followRedirects(HttpClient.Redirect.NEVER).build();
    }

    public String getAccessToken(String clientId, String clientSecret) throws Exception {
        String tokenUrl = "https://" + environment + ".api.nicecxone.com/api/v2/oauth2/token";
        String body = "grant_type=client_credentials&client_id=" + clientId + "&client_secret=" + clientSecret;
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(tokenUrl))
                .header("Content-Type", "application/x-www-form-urlencoded")
                .POST(HttpRequest.BodyPublishers.ofString(body))
                .build();
        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        if (response.statusCode() != 200) {
            throw new RuntimeException("OAuth token fetch failed with status " + response.statusCode());
        }
        JsonObject json = gson.fromJson(response.body(), JsonObject.class);
        return json.get("access_token").getAsString();
    }

    public boolean run(String clientId, String clientSecret, Map<String, String> queueMatrix) throws Exception {
        String batchId = "batch-" + UUID.randomUUID().toString().substring(0, 8);
        long batchStart = System.currentTimeMillis();

        // Validation Pipeline
        Set<String> seenLabels = new HashSet<>();
        for (Map.Entry<String, String> entry : queueMatrix.entrySet()) {
            if (entry.getKey() == null || entry.getKey().isBlank()) {
                throw new IllegalArgumentException("Queue identifier cannot be null or empty");
            }
            String label = entry.getValue();
            if (!LABEL_PATTERN.matcher(label).matches()) {
                throw new IllegalArgumentException("Label '" + label + "' fails character set compliance.");
            }
            if (seenLabels.contains(label)) {
                throw new IllegalArgumentException("Duplicate label detected: '" + label + "'.");
            }
            seenLabels.add(label);
        }
        if (queueMatrix.size() > MAX_BATCH_SIZE) {
            throw new IllegalArgumentException("Batch size exceeds maximum limit of " + MAX_BATCH_SIZE + ".");
        }

        logger.info("Audit: Batch {} initiated. Size: {}. Environment: {}", batchId, queueMatrix.size(), environment);

        List<QueueUpdatePayload> payloads = queueMatrix.entrySet().stream()
                .map(e -> new QueueUpdatePayload(e.getKey(), e.getValue(), "atomic_apply"))
                .toList();
        BatchManifest manifest = new BatchManifest(batchId, payloads, queueMatrix, "pending");

        String token = getAccessToken(clientId, clientSecret);
        boolean success = executeBatch(token, manifest);

        long duration = Duration.ofMillis(System.currentTimeMillis() - batchStart).toString();
        logger.info("Audit: Batch {} completed. Success: {}. Duration: {}", batchId, success, duration);
        return success;
    }

    private boolean executeBatch(String token, BatchManifest manifest) throws Exception {
        List<QueueUpdatePayload> payloads = manifest.payloads();
        
        // Collision Detection
        for (QueueUpdatePayload payload : payloads) {
            String existingLabel = fetchQueueName(token, payload.id());
            if (existingLabel != null && !existingLabel.equals(payload.name())) {
                if (isLabelInUse(token, payload.name(), payload.id())) {
                    logger.error("Collision detected. Label '{}' is already assigned to another queue.", payload.name());
                    triggerWebhook(manifest.batchId(), "collision_detected", Map.of("label", payload.name()));
                    return false;
                }
                originalLabels.put(payload.id(), existingLabel);
            }
        }

        List<String> appliedIds = Collections.synchronizedList(new ArrayList<>());
        Exception firstFailure = null;

        for (QueueUpdatePayload payload : payloads) {
            try {
                long start = System.nanoTime();
                applyUpdate(token, payload);
                long latencyMs = (System.nanoTime() - start) / 1_000_000;
                logger.info("Applied label '{}' to queue {}. Latency: {}ms", payload.name(), payload.id(), latencyMs);
                appliedIds.add(payload.id());
            } catch (Exception e) {
                firstFailure = e;
                logger.error("Mutation failed for queue {}: {}", payload.id(), e.getMessage());
                break;
            }
        }

        if (firstFailure != null) {
            logger.warn("Transaction failed. Rolling back {} applied labels.", appliedIds.size());
            rollback(token, appliedIds);
            triggerWebhook(manifest.batchId(), "rollback_completed", Map.of("failed_count", appliedIds.size()));
            return false;
        }

        invalidateRoutingCache(token);
        triggerWebhook(manifest.batchId(), "batch_success", Map.of("applied_count", appliedIds.size()));
        return true;
    }

    private String fetchQueueName(String token, String queueId) throws Exception {
        HttpRequest req = HttpRequest.newBuilder()
                .uri(URI.create(baseUrl + "/api/v2/routing/queues/" + queueId))
                .header("Authorization", "Bearer " + token)
                .header("Accept", "application/json")
                .GET()
                .build();
        HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
        if (res.statusCode() == 404) return null;
        if (res.statusCode() != 200) throw new RuntimeException("Fetch failed: " + res.statusCode());
        return gson.fromJson(res.body(), Map.class).getOrDefault("name", "").toString();
    }

    private boolean isLabelInUse(String token, String targetLabel, String excludeQueueId) throws Exception {
        String url = baseUrl + "/api/v2/routing/queues?name=" + targetLabel + "&page_size=25";
        while (url != null) {
            HttpRequest req = HttpRequest.newBuilder()
                    .uri(URI.create(url))
                    .header("Authorization", "Bearer " + token)
                    .GET()
                    .build();
            HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
            if (res.statusCode() != 200) throw new RuntimeException("Search failed: " + res.statusCode());
            
            Map<String, Object> json = gson.fromJson(res.body(), Map.class);
            List<Map<String, Object>> entities = (List) json.get("entities");
            for (Map<String, Object> entity : entities) {
                String id = entity.get("id").toString();
                String name = entity.get("name").toString();
                if (name.equals(targetLabel) && !id.equals(excludeQueueId)) {
                    return true;
                }
            }
            url = json.containsKey("next_page") ? (String) json.get("next_page") : null;
        }
        return false;
    }

    private void applyUpdate(String token, QueueUpdatePayload payload) throws Exception {
        String body = gson.toJson(Map.of("name", payload.name()));
        HttpRequest req = HttpRequest.newBuilder()
                .uri(URI.create(baseUrl + "/api/v2/routing/queues/" + payload.id()))
                .header("Authorization", "Bearer " + token)
                .header("Content-Type", "application/json")
                .header("X-CXONE-Cache-Control", "no-cache")
                .PUT(HttpRequest.BodyPublishers.ofString(body))
                .build();
        HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
        if (res.statusCode() == 429) {
            Thread.sleep(1500);
            applyUpdate(token, payload);
            return;
        }
        if (res.statusCode() != 200 && res.statusCode() != 204) {
            throw new RuntimeException("PUT failed: " + res.statusCode() + " " + res.body());
        }
    }

    private void rollback(String token, List<String> appliedIds) throws Exception {
        for (String id : appliedIds) {
            String original = originalLabels.get(id);
            if (original != null) {
                applyUpdate(token, new QueueUpdatePayload(id, original, "rollback"));
            }
        }
    }

    private void invalidateRoutingCache(String token) throws Exception {
        HttpRequest req = HttpRequest.newBuilder()
                .uri(URI.create(baseUrl + "/api/v2/routing/caches/queue"))
                .header("Authorization", "Bearer " + token)
                .DELETE()
                .build();
        HttpResponse<String> res = client.send(req, HttpResponse.BodyHandlers.ofString());
        if (res.statusCode() != 200 && res.statusCode() != 204) {
            logger.warn("Cache invalidation returned status: {}", res.statusCode());
        }
    }

    private void triggerWebhook(String batchId, String event, Map<String, Object> data) {
        try {
            Map<String, Object> payload = new HashMap<>();
            payload.put("batch_id", batchId);
            payload.put("event", event);
            payload.put("data", data);
            payload.put("timestamp", Instant.now().toString());
            
            HttpRequest req = HttpRequest.newBuilder()
                    .uri(URI.create(webhookUrl))
                    .header("Content-Type", "application/json")
                    .POST(HttpRequest.BodyPublishers.ofString(gson.toJson(payload)))
                    .build();
            client.send(req, HttpResponse.BodyHandlers.ofString());
        } catch (Exception e) {
            logger.error("Webhook delivery failed: {}", e.getMessage());
        }
    }

    public static void main(String[] args) throws Exception {
        String clientId = System.getenv("CXONE_CLIENT_ID");
        String clientSecret = System.getenv("CXONE_CLIENT_SECRET");
        String environment = System.getenv("CXONE_ENV");
        String webhook = System.getenv("CXONE_WEBHOOK_URL");

        QueueLabelBatcher batcher = new QueueLabelBatcher(
                "https://" + environment + ".api.nicecxone.com",
                webhook,
                environment
        );

        Map<String, String> updates = Map.of(
                "queue-id-1", "Finance_Support_East",
                "queue-id-2", "Finance_Support_West",
                "queue-id-3", "Billing_Tier2_Primary"
        );

        batcher.run(clientId, clientSecret, updates);
    }
}

Common Errors & Debugging

Error: 401 Unauthorized

  • Cause: Expired OAuth token or missing routing:queue:write scope.
  • Fix: Verify the client credentials have the required scopes. Implement token refresh logic before each batch cycle. The provided code fetches a fresh token per run.

Error: 403 Forbidden

  • Cause: The OAuth client lacks permissions for the target environment or queue.
  • Fix: Assign the client to the correct CXone organization and verify role-based access control (RBAC) policies allow queue modifications.

Error: 409 Conflict

  • Cause: Label collision detected during the collision detection phase.
  • Fix: The batcher automatically aborts and rolls back. Review the audit logs to identify the conflicting label and adjust the input matrix.

Error: 429 Too Many Requests

  • Cause: Exceeding CXone rate limits during rapid sequential PUT calls.
  • Fix: The applyUpdate method implements a 1.5 second sleep and single retry. For production, implement exponential backoff with jitter. Keep batch size at or below 50.

Error: 503 Service Unavailable

  • Cause: CXone routing cache invalidation endpoint is temporarily unavailable during high load.
  • Fix: The cache invalidation call logs a warning but does not fail the transaction. Retry the invalidation independently if routing state synchronization is critical.

Official References