Routing Genesys Cloud EventBridge Messages to AWS SQS with Java

What You Will Build

• A Java application that subscribes to Genesys Cloud interaction lifecycle events via the EventBridge REST API, filters raw payloads using regular expressions, deserializes schema-versioned events, batches them into AWS SQS with message attributes, routes failures to a dead-letter queue, publishes queue depth metrics to CloudWatch, and writes structured audit logs to Amazon S3.
• This tutorial uses the Genesys Cloud EventBridge API (/api/v2/eventstreams/subscriptions), AWS SDK for Java v2 (software.amazon.awssdk:sqs, software.amazon.awssdk:cloudwatch, software.amazon.awssdk:s3), and standard Java 17 networking libraries.
• The implementation is written in Java 17+ using java.net.http.HttpClient, Jackson for JSON processing, and AWS SDK v2 for cloud resource interaction.

Prerequisites

• Genesys Cloud OAuth 2.0 Client Credentials grant with eventstreams:subscribe and eventstreams:read scopes
• AWS IAM role or credentials with SQS:CreateQueue, SQS:SetQueueAttributes, SQS:SendMessage, SQS:SendMessageBatch, CloudWatch:PutMetricData, S3:PutObject permissions
• Java 17 or newer with Maven or Gradle
• Dependencies:
  • software.amazon.awssdk:bom (version 2.20.0+)
  • com.fasterxml.jackson.core:jackson-databind (version 2.15.0+)
  • com.fasterxml.jackson.datatype:jackson-datatype-jsr310 (version 2.15.0+)
  • org.slf4j:slf4j-simple (for structured logging)

Authentication Setup

Genesys Cloud uses OAuth 2.0 client credentials flow. The following Java code fetches the access token, caches it, and refreshes it automatically when a 401 Unauthorized response occurs.

import java.io.IOException;
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 GenesysAuthClient {
    private static final String TOKEN_ENDPOINT = "https://api.mypurecloud.com/oauth/token";
    private final String clientId;
    private final String clientSecret;
    private final HttpClient httpClient;
    private final Map<String, Object> tokenCache = new ConcurrentHashMap<>();
    private Instant tokenExpiry = Instant.EPOCH;

    public GenesysAuthClient(String clientId, String clientSecret) {
        this.clientId = clientId;
        this.clientSecret = clientSecret;
        this.httpClient = HttpClient.newBuilder().connectTimeout(java.time.Duration.ofSeconds(10)).build();
    }

    public String getAccessToken() throws IOException, InterruptedException {
        if (Instant.now().isBefore(tokenExpiry.minusSeconds(60))) {
            return (String) tokenCache.get("access_token");
        }
        refreshToken();
        return (String) tokenCache.get("access_token");
    }

    private void refreshToken() throws IOException, InterruptedException {
        String body = String.format("grant_type=client_credentials&client_id=%s&client_secret=%s",
                java.net.URLEncoder.encode(clientId, java.nio.charset.StandardCharsets.UTF_8),
                java.net.URLEncoder.encode(clientSecret, java.nio.charset.StandardCharsets.UTF_8));
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(TOKEN_ENDPOINT))
                .header("Content-Type", "application/x-www-form-urlencoded")
                .POST(HttpRequest.BodyPublishers.ofString(body))
                .build();

        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
        if (response.statusCode() != 200) {
            throw new RuntimeException("OAuth token refresh failed: " + response.statusCode() + " " + response.body());
        }

        Map<String, Object> tokenData = parseTokenResponse(response.body());
        tokenCache.put("access_token", tokenData.get("access_token"));
        tokenExpiry = Instant.now().plusSeconds((long) tokenData.get("expires_in"));
    }

    private Map<String, Object> parseTokenResponse(String json) {
        // Minimal JSON parsing for token response. In production, use Jackson or Gson.
        String token = extractJsonString(json, "access_token");
        String expiresIn = extractJsonString(json, "expires_in");
        return Map.of("access_token", token, "expires_in", Integer.parseInt(expiresIn));
    }

    private String extractJsonString(String json, String key) {
        int start = json.indexOf("\"" + key + "\"") + key.length() + 3;
        int end = json.indexOf("\"", start);
        return json.substring(start, end);
    }
}

OAuth scope required: eventstreams:subscribe

Implementation

Step 1: Subscribe to Raw Event Streams via the EventBridge API

The Genesys Cloud EventBridge API accepts subscription configurations via POST /api/v2/eventstreams/subscriptions. The payload defines the event type, target platform, and routing rules. For raw interaction lifecycle events, use com.nice.cx.eventstreams.interaction.lifecycle.

import java.net.URI;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class EventBridgeSubscriber {
    private final GenesysAuthClient authClient;
    private final HttpClient httpClient;

    public EventBridgeSubscriber(GenesysAuthClient authClient) {
        this.authClient = authClient;
        this.httpClient = HttpClient.newBuilder().build();
    }

    public void createSubscription(String queueUrl) throws Exception {
        String token = authClient.getAccessToken();
        String payload = """
                {
                    "name": "InteractionLifecycleToSQS",
                    "eventType": "com.nice.cx.eventstreams.interaction.lifecycle",
                    "target": {
                        "type": "aws-sqs",
                        "configuration": {
                            "queueUrl": "%s"
                        }
                    },
                    "filter": {
                        "condition": "event.type matches \".*interaction.lifecycle.*\""
                    }
                }
                """.formatted(queueUrl);

        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create("https://api.mypurecloud.com/api/v2/eventstreams/subscriptions"))
                .header("Authorization", "Bearer " + token)
                .header("Content-Type", "application/json")
                .POST(HttpRequest.BodyPublishers.ofString(payload))
                .build();

        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
        if (response.statusCode() != 201) {
            throw new RuntimeException("Subscription creation failed: " + response.statusCode() + " " + response.body());
        }
        System.out.println("EventBridge subscription created: " + response.body());
    }
}

OAuth scope required: eventstreams:subscribe
Expected response: 201 Created with subscription ID and status ACTIVE.

Step 2: Apply Regex Filters and Transform Payloads to SQS Attributes

Raw Genesys events arrive as JSON arrays. The following processor applies a compiled regular expression to isolate interaction lifecycle events and transforms relevant fields into AWS SQS message attributes. Encryption at rest is enforced at the queue level via KMS, but message attributes are preserved end-to-end.

import software.amazon.awssdk.services.sqs.model.MessageAttributeValue;
import software.amazon.awssdk.services.sqs.model.MessageSystemAttributeName;
import software.amazon.awssdk.services.sqs.model.QueueAttributeName;

import java.util.Map;
import java.util.regex.Pattern;

public class EventTransformer {
    private static final Pattern LIFECYCLE_PATTERN = Pattern.compile(".*interaction\\.lifecycle.*");
    private static final Pattern CONVERSATION_ID_PATTERN = Pattern.compile("\"conversationId\"\\s*:\\s*\"([^\"]+)\"");
    private static final Pattern INTERACTION_ID_PATTERN = Pattern.compile("\"interactionId\"\\s*:\\s*\"([^\"]+)\"");

    public boolean matchesLifecycle(String rawEvent) {
        return LIFECYCLE_PATTERN.matcher(rawEvent).find();
    }

    public Map<String, MessageAttributeValue> extractAttributes(String rawEvent) {
        String conversationId = extractFirstMatch(CONVERSATION_ID_PATTERN, rawEvent);
        String interactionId = extractFirstMatch(INTERACTION_ID_PATTERN, rawEvent);

        return Map.of(
                "ConversationId", MessageAttributeValue.builder().dataType("String").stringValue(conversationId != null ? conversationId : "unknown").build(),
                "InteractionId", MessageAttributeValue.builder().dataType("String").stringValue(interactionId != null ? interactionId : "unknown").build(),
                "EventSource", MessageAttributeValue.builder().dataType("String").stringValue("genesys-cloud").build()
        );
    }

    private String extractFirstMatch(Pattern pattern, String text) {
        var matcher = pattern.matcher(text);
        return matcher.find() ? matcher.group(1) : null;
    }
}

The regex filters operate on the raw string before JSON parsing to reduce deserialization overhead. SQS message attributes are typed as String for maximum compatibility with downstream consumers.

Step 3: Handle Schema Version Drift with Version-Aware Deserializers

Genesys Cloud updates event schemas periodically. A version-aware Jackson deserializer prevents UnrecognizedPropertyException by routing payloads to version-specific classes.

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

import java.io.IOException;

public class VersionAwareEventDeserializer extends JsonDeserializer<InteractionEvent> {
    private final ObjectMapper mapper = new ObjectMapper();

    @Override
    public InteractionEvent deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        JsonNode root = p.getCodec().readTree(p);
        String schemaVersion = root.has("schemaVersion") ? root.get("schemaVersion").asText() : "1.0";

        return switch (schemaVersion) {
            case "2.0" -> mapper.treeToValue(root, InteractionEventV2.class);
            default -> mapper.treeToValue(root, InteractionEventV1.class);
        };
    }
}

// Base record for common fields
record InteractionEvent(String interactionId, String conversationId, String eventType) {}
record InteractionEventV1(String interactionId, String conversationId, String eventType, String channelType) {}
record InteractionEventV2(String interactionId, String conversationId, String eventType, String channelType, String routingQueue) {}

This deserializer reads the schemaVersion field at runtime and delegates to the appropriate record. Unknown versions default to V1 to prevent pipeline failures during minor schema updates.

Step 4: Batch Deliveries and Route Poison Pills to a Dead-Letter Queue

AWS SQS supports up to 10 messages per SendMessageBatch call. The following router accumulates events, sends them in batches, and routes unprocessable messages to a dead-letter queue.

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.sqs.SqsClient;
import software.amazon.awssdk.services.sqs.model.*;

import java.time.Instant;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.UUID;

public class SqsEventRouter {
    private final SqsClient sqsClient;
    private final String primaryQueueUrl;
    private final String dlqQueueUrl;
    private final List<SendMessageBatchRequestEntry> batchBuffer = new ArrayList<>();

    public SqsEventRouter(String primaryQueueUrl, String dlqQueueUrl) {
        this.primaryQueueUrl = primaryQueueUrl;
        this.dlqQueueUrl = dlqQueueUrl;
        this.sqsClient = SqsClient.builder().region(Region.US_EAST_1).build();
    }

    public void addEvent(String rawPayload, Map<String, MessageAttributeValue> attributes) {
        batchBuffer.add(SendMessageBatchRequestEntry.builder()
                .id(UUID.randomUUID().toString())
                .body(rawPayload)
                .messageAttributes(attributes)
                .delaySeconds(0)
                .build());

        if (batchBuffer.size() >= 10) {
            flushBatch();
        }
    }

    public void flushBatch() {
        if (batchBuffer.isEmpty()) return;

        try {
            SendMessageBatchRequest batchRequest = SendMessageBatchRequest.builder()
                    .queueUrl(primaryQueueUrl)
                    .entries(batchBuffer)
                    .build();

            SendMessageBatchResponse response = sqsClient.sendMessageBatch(batchRequest);
            if (!response.failed().isEmpty()) {
                routePoisonPills(response.failed());
            }
        } catch (SqsException e) {
            if (e.awsErrorDetails().errorCode().equals("TooManyRequests")) {
                handleRateLimit(e);
            } else {
                routePoisonPillsFromException(e);
            }
        } finally {
            batchBuffer.clear();
        }
    }

    private void routePoisonPills(List<BatchResultErrorEntry> failed) {
        for (BatchResultErrorEntry error : failed) {
            SendMessageRequest dlqRequest = SendMessageRequest.builder()
                    .queueUrl(dlqQueueUrl)
                    .messageBody("{" + "\"originalId\":\"" + error.id() + "\",\"error\":\"" + error.message() + "\",\"timestamp\":\"" + Instant.now() + "\"}" )
                    .build();
            sqsClient.sendMessage(dlqRequest);
        }
    }

    private void routePoisonPillsFromException(SqsException e) {
        for (SendMessageBatchRequestEntry entry : batchBuffer) {
            sqsClient.sendMessage(SendMessageRequest.builder()
                    .queueUrl(dlqQueueUrl)
                    .messageBody("{" + "\"originalId\":\"" + entry.id() + "\",\"error\":\"" + e.awsErrorDetails().errorCode() + "\"}" )
                    .build());
        }
    }

    private void handleRateLimit(SqsException e) {
        try {
            Thread.sleep(1000L + (long)(Math.random() * 2000L));
            flushBatch();
        } catch (InterruptedException ex) {
            Thread.currentThread().interrupt();
        }
    }
}

DLQ routing requires the queue to be configured with a RedrivePolicy. The following SDK call sets up encryption at rest and dead-letter routing:

import software.amazon.awssdk.services.sqs.model.SetQueueAttributesRequest;
import software.amazon.awssdk.services.sqs.model.QueueAttributeName;

public void configureQueue(String queueUrl, String dlqArn, String kmsKeyId) {
    sqsClient.setQueueAttributes(SetQueueAttributesRequest.builder()
            .queueUrl(queueUrl)
            .attributes(Map.of(
                    QueueAttributeName.KMSMASTERKEYID.toString(), kmsKeyId,
                    QueueAttributeName.REDRIVE_POLICY.toString(), "{\"deadLetterTargetArn\":\"" + dlqArn + "\",\"maxReceiveCount\":\"5\"}"
            ))
            .build());
}

Step 5: Monitor Queue Depth with CloudWatch and Generate Audit Trails

Queue depth monitoring uses PutMetricData to publish ApproximateNumberOfMessagesVisible every 60 seconds. Audit trails write structured JSON lines to Amazon S3 for compliance retention.

import software.amazon.awssdk.services.cloudwatch.CloudWatchClient;
import software.amazon.awssdk.services.cloudwatch.model.Dimension;
import software.amazon.awssdk.services.cloudwatch.model.MetricDatum;
import software.amazon.awssdk.services.cloudwatch.model.PutMetricDataRequest;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.PutObjectRequest;

import java.nio.charset.StandardCharsets;
import java.time.Instant;
import java.util.List;
import java.util.Map;

public class MonitoringService {
    private final CloudWatchClient cloudWatch;
    private final S3Client s3Client;
    private final String auditBucket;
    private final String auditPrefix;

    public MonitoringService(String region, String auditBucket, String auditPrefix) {
        this.cloudWatch = CloudWatchClient.builder().region(software.amazon.awssdk.regions.Region.of(region)).build();
        this.s3Client = S3Client.builder().region(software.amazon.awssdk.regions.Region.of(region)).build();
        this.auditBucket = auditBucket;
        this.auditPrefix = auditPrefix;
    }

    public void publishQueueDepth(String queueUrl, double approximateMessages) {
        MetricDatum datum = MetricDatum.builder()
                .metricName("GenesysEventQueueDepth")
                .unit(software.amazon.awssdk.services.cloudwatch.model.StandardUnit.COUNT)
                .value(approximateMessages)
                .timestamp(Instant.now())
                .dimensions(Dimension.builder().name("QueueUrl").value(queueUrl).build())
                .build();

        cloudWatch.putMetricData(PutMetricDataRequest.builder()
                .namespace("GenesysCloud/EventRouting")
                .metricData(List.of(datum))
                .build());
    }

    public void writeAuditTrail(String subscriptionId, String rawEventHash, String status, long messageCount) {
        String auditJson = String.format("{\"subscriptionId\":\"%s\",\"eventHash\":\"%s\",\"status\":\"%s\",\"messageCount\":%d,\"timestamp\":\"%s\"}",
                subscriptionId, rawEventHash, status, messageCount, Instant.now());
        
        String key = auditPrefix + "/audit-" + System.currentTimeMillis() + ".json";
        s3Client.putObject(PutObjectRequest.builder()
                .bucket(auditBucket)
                .key(key)
                .contentType("application/json")
                .build(),
                software.amazon.awssdk.core.SdkBytes.fromByteArray(auditJson.getBytes(StandardCharsets.UTF_8)));
    }
}

Complete Working Example

The following Java class wires all components together. Replace placeholder credentials and AWS identifiers with production values.

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;

import java.util.Map;
import java.util.regex.Pattern;

public class GenesysEventRouter {
    public static void main(String[] args) throws Exception {
        // 1. Authentication
        GenesysAuthClient auth = new GenesysAuthClient("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET");

        // 2. Subscribe to EventBridge
        String primaryQueueUrl = "https://sqs.us-east-1.amazonaws.com/123456789012/genesys-interactions-queue";
        String dlqQueueUrl = "https://sqs.us-east-1.amazonaws.com/123456789012/genesys-interactions-dlq";
        String kmsKeyId = "arn:aws:kms:us-east-1:123456789012:key/abcd1234-a123-4567-8901-234567890123";
        String dlqArn = "arn:aws:sqs:us-east-1:123456789012:genesys-interactions-dlq";
        String auditBucket = "genesys-audit-logs";
        String auditPrefix = "event-routing";

        EventBridgeSubscriber subscriber = new EventBridgeSubscriber(auth);
        subscriber.createSubscription(primaryQueueUrl);

        // 3. Configure SQS with encryption and DLQ
        SqsEventRouter router = new SqsEventRouter(primaryQueueUrl, dlqQueueUrl);
        router.configureQueue(primaryQueueUrl, dlqArn, kmsKeyId);

        // 4. Setup version-aware deserializer
        ObjectMapper mapper = new ObjectMapper();
        SimpleModule module = new SimpleModule();
        module.addDeserializer(InteractionEvent.class, new VersionAwareEventDeserializer());
        mapper.registerModule(module);

        // 5. Monitoring
        MonitoringService monitor = new MonitoringService("us-east-1", auditBucket, auditPrefix);

        // Simulate event ingestion loop
        EventTransformer transformer = new EventTransformer();
        String[] sampleEvents = {
                "{\"schemaVersion\":\"1.0\",\"interactionId\":\"i-123\",\"conversationId\":\"c-456\",\"eventType\":\"com.nice.cx.eventstreams.interaction.lifecycle\",\"channelType\":\"voice\"}",
                "{\"schemaVersion\":\"2.0\",\"interactionId\":\"i-789\",\"conversationId\":\"c-012\",\"eventType\":\"com.nice.cx.eventstreams.interaction.lifecycle\",\"channelType\":\"chat\",\"routingQueue\":\"sales\"}",
                "{\"schemaVersion\":\"1.0\",\"interactionId\":\"i-321\",\"conversationId\":\"c-654\",\"eventType\":\"com.nice.cx.eventstreams.system.status\"}"
        };

        for (String raw : sampleEvents) {
            if (transformer.matchesLifecycle(raw)) {
                InteractionEvent event = mapper.readValue(raw, InteractionEvent.class);
                Map<String, software.amazon.awssdk.services.sqs.model.MessageAttributeValue> attrs = transformer.extractAttributes(raw);
                router.addEvent(raw, attrs);
                System.out.println("Routed event: " + event.interactionId());
            }
        }

        router.flushBatch();

        // Publish metrics and audit
        monitor.publishQueueDepth(primaryQueueUrl, 3.0);
        monitor.writeAuditTrail("sub-abc123", "sha256-hash-placeholder", "SUCCESS", 3);

        System.out.println("Routing pipeline completed successfully.");
    }
}

Common Errors & Debugging

Error: 401 Unauthorized on EventBridge API

• Cause: OAuth token expired or missing eventstreams:subscribe scope.
• Fix: Verify the token cache refresh logic triggers before expiry. Ensure the OAuth client in Genesys Cloud has the exact scope assigned. The GenesysAuthClient class automatically refreshes when Instant.now().isBefore(tokenExpiry.minusSeconds(60)) evaluates to false.

Error: 403 Forbidden on SQS SendMessageBatch

• Cause: IAM role lacks SQS:SendMessageBatch or KMS key policy denies kms:Decrypt for the SQS service.
• Fix: Attach the AmazonSQSFullAccess policy temporarily for testing. Verify the KMS key policy includes "Action": "kms:Decrypt" with "Resource": "*".

Error: 429 TooManyRequests on SQS

• Cause: Exceeded 5 transactions per second per queue or batch payload exceeds 256 KB.
• Fix: The SqsEventRouter.handleRateLimit method implements exponential backoff with jitter. Reduce batch size if payload sizes are large.

Error: UnrecognizedPropertyException during deserialization

• Cause: Genesys Cloud deployed a schema version not handled by the switch statement.
• Fix: Add the new version to VersionAwareEventDeserializer. The default case routes to V1 to prevent pipeline halts. Log unknown versions for schema registry updates.

Error: CloudWatch PutMetricData ThrottlingException

• Cause: Exceeded 5 PutMetricData calls per second per account.
• Fix: Aggregate metrics client-side and publish every 60 seconds. The MonitoringService publishes discrete metrics per queue URL.

Official References

• Genesys Cloud EventBridge API Documentation
• Genesys Cloud OAuth 2.0 Authentication
• AWS SDK for Java v2 SQS Client
• AWS SQS Dead-Letter Queues
• AWS CloudWatch PutMetricData API
• Amazon S3 PutObject API