Managing NICE Cognigy Bot Draft Versions via REST API with Java

What You Will Build

• This code creates, validates, and tracks bot draft versions in NICE Cognigy using atomic POST operations with automatic snapshot capture triggers.
• It uses the Cognigy REST API v1 endpoints for bot drafts, version management, and OAuth token retrieval.
• The tutorial covers Java 17 with java.net.http for HTTP operations and Jackson for JSON serialization.

Prerequisites

• OAuth 2.0 Client Credentials flow with bot:read, bot:write, draft:read, draft:write, and webhook:write scopes
• Cognigy API v1
• Java 17 runtime
• Jackson Databind 2.15+ (com.fasterxml.jackson.core:jackson-databind)
• Active Cognigy tenant with API access enabled

Authentication Setup

Cognigy uses a standard OAuth 2.0 client credentials flow. The token endpoint returns a JWT that expires after a fixed duration. You must cache the token and refresh it before expiration to avoid 401 interruptions during batch draft operations.

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Instant;
import java.util.Map;

public class CognigyAuth {
    private final HttpClient client;
    private final ObjectMapper mapper;
    private String cachedToken;
    private Instant tokenExpiry;

    public CognigyAuth() {
        this.client = HttpClient.newHttpClient();
        this.mapper = new ObjectMapper();
        this.tokenExpiry = Instant.now();
    }

    public String getAccessToken(String domain, String clientId, String clientSecret) throws Exception {
        if (cachedToken != null && Instant.now().isBefore(tokenExpiry)) {
            return cachedToken;
        }

        String url = String.format("https://%s.cognigy.com/api/v1/oauth/token", domain);
        String body = "grant_type=client_credentials&client_id=" + clientId + "&client_secret=" + clientSecret;

        HttpRequest request = HttpRequest.newBuilder()
            .uri(java.net.URI.create(url))
            .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());
        }

        JsonNode json = mapper.readTree(response.body());
        cachedToken = json.get("access_token").asText();
        int expiresIn = json.get("expires_in").asInt();
        tokenExpiry = Instant.now().plusSeconds(expiresIn - 60);
        return cachedToken;
    }
}

Implementation

Step 1: Draft Payload Construction and Schema Validation

You must construct the draft payload with explicit bot ID references, version naming matrices, and snapshot source directives. Cognigy enforces strict version naming conventions and limits concurrent drafts per bot to prevent deployment collisions.

import java.util.regex.Pattern;

public record DraftPayload(String botId, String name, String description, String snapshotSource, Map<String, String> metadata) {
    private static final Pattern VERSION_MATRIX = Pattern.compile("^v\\d+\\.\\d+\\.\\d+-draft$");
    
    public DraftPayload {
        if (botId == null || botId.isBlank()) {
            throw new IllegalArgumentException("botId cannot be null or empty");
        }
        if (!VERSION_MATRIX.matcher(name).matches()) {
            throw new IllegalArgumentException("name must follow semantic versioning matrix: vX.Y.Z-draft");
        }
        if (!java.util.Set.of("CURRENT", "SPECIFIC_VERSION", "EXTERNAL").contains(snapshotSource)) {
            throw new IllegalArgumentException("snapshotSource must be CURRENT, SPECIFIC_VERSION, or EXTERNAL");
        }
    }
}

Step 2: Concurrent Draft Limit Verification and State Machine Consistency

Before creating a draft, you must query existing drafts to enforce concurrent limits. Cognigy typically allows one active draft per bot. You also need to verify that the bot is not in a locked deployment state.

import com.fasterxml.jackson.databind.JsonNode;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.ArrayList;
import java.util.List;

public class DraftValidator {
    private final HttpClient client;
    private final ObjectMapper mapper;
    private final String baseUrl;
    private final String token;

    public DraftValidator(HttpClient client, ObjectMapper mapper, String baseUrl, String token) {
        this.client = client;
        this.mapper = mapper;
        this.baseUrl = baseUrl;
        this.token = token;
    }

    public void validateConcurrencyAndState(String botId, int maxConcurrentDrafts) throws Exception {
        String draftEndpoint = String.format("%s/api/v1/bots/%s/drafts?limit=100&skip=0", baseUrl, botId);
        HttpRequest request = HttpRequest.newBuilder()
            .uri(java.net.URI.create(draftEndpoint))
            .header("Authorization", "Bearer " + token)
            .GET()
            .build();

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

        JsonNode root = mapper.readTree(response.body());
        int activeDraftCount = root.has("data") ? root.get("data").size() : 0;

        if (activeDraftCount >= maxConcurrentDrafts) {
            throw new IllegalStateException(String.format(
                "Concurrent draft limit exceeded. Active drafts: %d, Limit: %d", activeDraftCount, maxConcurrentDrafts));
        }

        validateStateMachine(root, botId);
    }

    private void validateStateMachine(JsonNode root, String botId) {
        if (root.has("data")) {
            for (JsonNode draft : root.get("data")) {
                String status = draft.get("status").asText("UNKNOWN");
                if (status.equals("LOCKED") || status.equals("DEPLOYING")) {
                    throw new IllegalStateException("Bot state machine conflict: existing draft is in " + status + " state. Abort creation.");
                }
            }
        }
    }
}

Step 3: Atomic Draft Creation with Retry Logic and Snapshot Triggers

Draft creation uses an atomic POST operation. You must implement exponential backoff for 429 rate limits and verify the response payload format. The API automatically triggers a snapshot capture when snapshotSource is set to CURRENT.

import java.time.Duration;
import java.util.HashMap;

public class DraftCreator {
    private final HttpClient client;
    private final ObjectMapper mapper;
    private final String baseUrl;
    private final String token;

    public DraftCreator(HttpClient client, ObjectMapper mapper, String baseUrl, String token) {
        this.client = client;
        this.mapper = mapper;
        this.baseUrl = baseUrl;
        this.token = token;
    }

    public JsonNode createDraft(DraftPayload payload) throws Exception {
        String endpoint = String.format("%s/api/v1/bots/%s/drafts", baseUrl, payload.botId());
        String jsonBody = mapper.writeValueAsString(payload);

        HttpRequest request = HttpRequest.newBuilder()
            .uri(java.net.URI.create(endpoint))
            .header("Authorization", "Bearer " + token)
            .header("Content-Type", "application/json")
            .header("Accept", "application/json")
            .POST(HttpRequest.BodyPublishers.ofString(jsonBody))
            .build();

        int maxRetries = 3;
        long delayMs = 1000;

        for (int attempt = 1; attempt <= maxRetries; attempt++) {
            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
            
            if (response.statusCode() == 429) {
                if (attempt < maxRetries) {
                    Thread.sleep(delayMs);
                    delayMs *= 2;
                    continue;
                }
                throw new RuntimeException("Rate limit exceeded after " + maxRetries + " retries");
            }

            if (response.statusCode() < 200 || response.statusCode() >= 300) {
                throw new RuntimeException("Draft creation failed with status " + response.statusCode() + ": " + response.body());
            }

            JsonNode result = mapper.readTree(response.body());
            if (!result.has("id") || !result.has("status")) {
                throw new IllegalStateException("Invalid response format from Cognigy API");
            }
            return result;
        }
        throw new RuntimeException("Unexpected retry loop termination");
    }
}

Step 4: Webhook Synchronization, Metrics Tracking, and Audit Logging

You must synchronize draft creation events with external version control systems via webhook callbacks. Track creation latency and validation success rates for development efficiency. Generate structured audit logs for governance compliance.

import java.io.FileWriter;
import java.io.IOException;
import java.time.Instant;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

public class DraftMetricsAndAudit {
    private final AtomicInteger successCount = new AtomicInteger(0);
    private final AtomicInteger failureCount = new AtomicInteger(0);
    private final AtomicLong totalLatencyNs = new AtomicLong(0);
    private final String auditLogPath;

    public DraftMetricsAndAudit(String auditLogPath) {
        this.auditLogPath = auditLogPath;
    }

    public void recordSuccess(long latencyNs) {
        successCount.incrementAndGet();
        totalLatencyNs.addAndGet(latencyNs);
    }

    public void recordFailure(long latencyNs) {
        failureCount.incrementAndGet();
        totalLatencyNs.addAndGet(latencyNs);
    }

    public double getSuccessRate() {
        int total = successCount.get() + failureCount.get();
        return total == 0 ? 0.0 : (double) successCount.get() / total;
    }

    public double getAverageLatencyMs() {
        int total = successCount.get() + failureCount.get();
        return total == 0 ? 0.0 : (totalLatencyNs.get() / total) / 1_000_000.0;
    }

    public void writeAuditLog(String botId, String draftId, String status, long latencyMs, String errorMessage) throws IOException {
        String timestamp = Instant.now().toString();
        String logEntry = String.format("%s|%s|%s|%s|%d|%s|%s%n",
            timestamp, botId, draftId, status, latencyMs, errorMessage, this.getSuccessRate());
        try (FileWriter writer = new FileWriter(auditLogPath, true)) {
            writer.write(logEntry);
        }
    }
}

public class WebhookSync {
    private final HttpClient client;
    private final String webhookUrl;

    public WebhookSync(HttpClient client, String webhookUrl) {
        this.client = client;
        this.webhookUrl = webhookUrl;
    }

    public void triggerVcsSync(String draftId, String botId, String commitHash) throws Exception {
        String payload = String.format(
            "{\"event\":\"draft.created\",\"draftId\":\"%s\",\"botId\":\"%s\",\"commitHash\":\"%s\",\"timestamp\":\"%s\"}",
            draftId, botId, commitHash, Instant.now());

        HttpRequest request = HttpRequest.newBuilder()
            .uri(java.net.URI.create(webhookUrl))
            .header("Content-Type", "application/json")
            .header("X-Source", "Cognigy-DraftManager")
            .POST(HttpRequest.BodyPublishers.ofString(payload))
            .build();

        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        if (response.statusCode() < 200 || response.statusCode() >= 300) {
            throw new RuntimeException("Webhook sync failed with status " + response.statusCode());
        }
    }
}

Complete Working Example

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.net.http.HttpClient;
import java.util.Map;

public class CognigyDraftManager {
    private final HttpClient client;
    private final ObjectMapper mapper;
    private final CognigyAuth auth;
    private final DraftValidator validator;
    private final DraftCreator creator;
    private final WebhookSync webhookSync;
    private final DraftMetricsAndAudit metrics;

    public CognigyDraftManager(String domain, String clientId, String clientSecret, String webhookUrl, String auditLogPath) throws Exception {
        this.client = HttpClient.newBuilder().followRedirects(HttpClient.Redirect.NORMAL).build();
        this.mapper = new ObjectMapper();
        this.auth = new CognigyAuth();
        String token = auth.getAccessToken(domain, clientId, clientSecret);
        String baseUrl = "https://" + domain + ".cognigy.com";
        
        this.validator = new DraftValidator(client, mapper, baseUrl, token);
        this.creator = new DraftCreator(client, mapper, baseUrl, token);
        this.webhookSync = new WebhookSync(client, webhookUrl);
        this.metrics = new DraftMetricsAndAudit(auditLogPath);
    }

    public JsonNode manageDraftVersion(String botId, String versionName, String description, String snapshotSource, String commitHash) throws Exception {
        long startNs = System.nanoTime();
        String draftId = "unknown";
        String status = "FAILED";
        String error = "";

        try {
            Map<String, String> metadata = Map.of("sourceBranch", "main", "commitHash", commitHash);
            DraftPayload payload = new DraftPayload(botId, versionName, description, snapshotSource, metadata);

            validator.validateConcurrencyAndState(botId, 1);

            JsonNode result = creator.createDraft(payload);
            draftId = result.get("id").asText();
            status = "SUCCESS";

            webhookSync.triggerVcsSync(draftId, botId, commitHash);
            metrics.recordSuccess(System.nanoTime() - startNs);
            return result;
        } catch (Exception e) {
            error = e.getMessage();
            metrics.recordFailure(System.nanoTime() - startNs);
            throw e;
        } finally {
            long latencyMs = (System.nanoTime() - startNs) / 1_000_000;
            metrics.writeAuditLog(botId, draftId, status, latencyMs, error);
        }
    }

    public static void main(String[] args) throws Exception {
        String domain = System.getenv("COGNIGY_DOMAIN");
        String clientId = System.getenv("COGNIGY_CLIENT_ID");
        String clientSecret = System.getenv("COGNIGY_CLIENT_SECRET");
        String webhookUrl = System.getenv("VCS_WEBHOOK_URL");
        String auditLogPath = "draft_audit.log";

        CognigyDraftManager manager = new CognigyDraftManager(domain, clientId, clientSecret, webhookUrl, auditLogPath);
        JsonNode draft = manager.manageDraftVersion("bot_prod_01", "v2.1.0-draft", "Feature branch snapshot", "CURRENT", "a1b2c3d4e5");
        System.out.println("Draft created successfully: " + draft.get("id").asText());
    }
}

Common Errors & Debugging

Error: 401 Unauthorized

• What causes it: The OAuth token has expired or the client credentials are invalid.
• How to fix it: Ensure the CognigyAuth class caches the token and checks expiration before reuse. Rotate credentials if the client secret was recently updated.
• Code showing the fix: The getAccessToken method compares Instant.now() against tokenExpiry and fetches a new token when within 60 seconds of expiration.

Error: 409 Conflict

• What causes it: A draft with the identical name already exists, or the bot is in a locked state.
• How to fix it: Use unique version matrices for each draft run. Query the bot state before creation.
• Code showing the fix: The validateStateMachine method checks for LOCKED or DEPLOYING status in existing drafts and throws IllegalStateException before POST execution.

Error: 422 Unprocessable Entity

• What causes it: The payload schema violates Cognigy constraints, such as an invalid snapshotSource value or malformed metadata structure.
• How to fix it: Validate the DraftPayload record against allowed enumerations before serialization.
• Code showing the fix: The DraftPayload constructor enforces snapshotSource to be exactly CURRENT, SPECIFIC_VERSION, or EXTERNAL. It also validates the version naming regex.

Error: 429 Too Many Requests

• What causes it: The API rate limit is exceeded due to rapid draft creation or concurrent bot operations.
• How to fix it: Implement exponential backoff retry logic.
• Code showing the fix: The createDraft method catches 429 responses, sleeps for an increasing delay, and retries up to three times before failing.

Official References

• Cognigy REST API Documentation
• Cognigy OAuth 2.0 Guide
• Cognigy Bot Drafts Endpoint Reference
• Java HttpClient Documentation
• Jackson Databind Reference