Flattening Genesys Cloud SCIM Group Hierarchies with Java

What You Will Build

• The code resolves nested SCIM groups into a flat member matrix while enforcing depth limits, cycle detection, and role inheritance validation.
• This uses the Genesys Cloud SCIM API and the official Java SDK.
• The tutorial is implemented in Java 17.

Prerequisites

• OAuth Client type: Service Account (Client Credentials Grant)
• Required scopes: scim:group:read, scim:user:read, webhook:readwrite
• SDK version: genesys-cloud-java-sdk v1.0.0 or later
• Runtime: Java 17 LTS
• External dependencies: com.fasterxml.jackson.core:jackson-databind:2.15.2, org.slf4j:slf4j-simple:2.0.9

Authentication Setup

Genesys Cloud requires a bearer token for all SCIM operations. The SDK handles token caching and automatic refresh, but you must initialize the ApiClient with your service account credentials before invoking any SCIM methods.

import com.mypurecloud.sdk.v2.ApiClient;
import com.mypurecloud.sdk.v2.auth.OAuth;
import com.mypurecloud.sdk.v2.client.Configuration;

public class GenesysAuthSetup {
    public static ApiClient initClient(String clientId, String clientSecret, String basePath) throws Exception {
        ApiClient client = new ApiClient();
        client.setBasePath(basePath);
        
        OAuth oauth = new OAuth.Builder()
                .clientId(clientId)
                .clientSecret(clientSecret)
                .build();
                
        Configuration.setDefaultApiClient(client);
        client.setAuth(oauth);
        
        // Pre-authenticate to verify credentials and populate the token cache
        client.getOAuthApi().postOAuthTokenClientCredentials(
                new com.mypurecloud.sdk.v2.model.OAuthClientCredentials()
                        .scope("scim:group:read scim:user:read webhook:readwrite")
        );
        
        return client;
    }
}

The postOAuthTokenClientCredentials call triggers the client credentials flow. The SDK stores the resulting access token in memory and automatically appends the Authorization: Bearer <token> header to subsequent requests. When the token approaches expiration, the SDK intercepts the call, refreshes it transparently, and retries the original request.

Implementation

Step 1: Initialize SDK & Configure Client

The SCIM API resides under the /api/v2/scim/v2 path. You must instantiate the ScimApi class using the configured ApiClient. The SDK enforces type safety and serializes JSON payloads automatically.

import com.mypurecloud.sdk.v2.api.ScimApi;
import com.mypurecloud.sdk.v2.client.ApiException;
import com.mypurecloud.sdk.v2.model.ScimGroup;
import com.mypurecloud.sdk.v2.model.ScimUser;

import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.time.Instant;
import java.time.Duration;

public class ScimHierarchyFlattener {
    private final ScimApi scimApi;
    private final int maxDepth;
    private final Set<String> visitedGroups = Collections.synchronizedSet(new HashSet<>());
    private final Map<String, List<ScimUser>> flatMemberMatrix = Collections.synchronizedMap(new HashMap<>());
    
    // Metrics tracking
    private final Instant startTime = Instant.now();
    private final AtomicInteger successCount = new AtomicInteger(0);
    private final AtomicInteger failureCount = new AtomicInteger(0);
    private final List<String> auditLog = Collections.synchronizedList(new ArrayList<>());

    public ScimHierarchyFlattener(ScimApi scimApi, int maxDepth) {
        this.scimApi = scimApi;
        this.maxDepth = maxDepth;
    }

    public FlattenResult flattenHierarchy(String rootGroupId) throws Exception {
        visitedGroups.clear();
        flatMemberMatrix.clear();
        auditLog.add(String.format("[%s] INITIATE FLATTEN: rootGroup=%s, maxDepth=%d", 
                Instant.now().toString(), rootGroupId, maxDepth));
        
        resolveGroupMembers(rootGroupId, 0);
        
        long latencyMs = Duration.between(startTime, Instant.now()).toMillis();
        int totalCalls = successCount.get() + failureCount.get();
        double successRate = totalCalls > 0 ? (double) successCount.get() / totalCalls : 0.0;
        
        auditLog.add(String.format("[%s] COMPLETE FLATTEN: latency=%dms, successRate=%.2f%%, totalGroups=%d",
                Instant.now().toString(), latencyMs, successRate * 100, visitedGroups.size()));
                
        return new FlattenResult(flatMemberMatrix, auditLog, latencyMs, successRate);
    }
}

The flattenHierarchy method resets state, initiates the recursive traversal, and calculates latency and success rates. The AtomicInteger counters ensure thread-safe metric aggregation if you parallelize group resolution later.

Step 2: Recursive Traversal & Cycle Detection

SCIM supports nested groups through the members array. A recursive directive must track visited group identifiers to prevent infinite loops caused by circular references. The maximum traversal depth parameter stops descent when organizational complexity exceeds safe limits.

    private void resolveGroupMembers(String groupId, int currentDepth) throws Exception {
        if (currentDepth > maxDepth) {
            auditLog.add(String.format("[%s] DEPTH_LIMIT_EXCEEDED: group=%s, depth=%d", Instant.now().toString(), groupId, currentDepth));
            throw new IllegalStateException(String.format("Maximum traversal depth %d exceeded for group %s", maxDepth, groupId));
        }
        
        if (visitedGroups.contains(groupId)) {
            auditLog.add(String.format("[%s] CYCLE_DETECTED: group=%s, aborting recursion", Instant.now().toString(), groupId));
            return;
        }
        
        visitedGroups.add(groupId);
        auditLog.add(String.format("[%s] FETCH_GROUP: id=%s, depth=%d", Instant.now().toString(), groupId, currentDepth));
        
        // Atomic GET operation with retry logic for 429
        ScimGroup group = fetchGroupWithRetry(groupId);
        
        // Format verification
        if (group.getMembers() == null || group.getMembers().isEmpty()) {
            auditLog.add(String.format("[%s] EMPTY_MEMBERS: group=%s", Instant.now().toString(), groupId));
            return;
        }
        
        List<ScimUser> expandedMembers = new ArrayList<>();
        
        for (com.mypurecloud.sdk.v2.model.ScimMember member : group.getMembers()) {
            if (member.getType() != null && member.getType().equals("Group")) {
                // Recursive directive for nested groups
                resolveGroupMembers(member.getValue(), currentDepth + 1);
                // Merge nested group members into current matrix
                if (flatMemberMatrix.containsKey(member.getValue())) {
                    expandedMembers.addAll(flatMemberMatrix.get(member.getValue()));
                }
            } else if (member.getType() != null && member.getType().equals("User")) {
                // Direct user membership
                ScimUser user = fetchUserWithRetry(member.getValue());
                expandedMembers.add(user);
            }
        }
        
        // Deduplicate and store in flat matrix
        Set<String> seenUserIds = new HashSet<>();
        List<ScimUser> deduplicatedMembers = new ArrayList<>();
        for (ScimUser u : expandedMembers) {
            if (seenUserIds.add(u.getId())) {
                deduplicatedMembers.add(u);
            }
        }
        
        flatMemberMatrix.put(groupId, deduplicatedMembers);
        successCount.incrementAndGet();
        auditLog.add(String.format("[%s] FLATTEN_SUCCESS: group=%s, resolvedUsers=%d", Instant.now().toString(), groupId, deduplicatedMembers.size()));
    }

The cycle detection check occurs before the API call. If a group appears twice in the traversal path, the method returns immediately. The depth check prevents stack overflow in deeply nested directory structures. The matrix stores deduplicated users per parent group.

Step 3: Membership Expansion & Format Verification

The Genesys Cloud SCIM API returns a ScimGroup object containing a members list. Each member contains a value (resource ID), type (User or Group), and display (human-readable name). You must verify the response format before processing. The retry logic handles transient rate limits.

    private ScimGroup fetchGroupWithRetry(String groupId) throws Exception {
        int retries = 3;
        long backoffMs = 1000;
        
        for (int attempt = 1; attempt <= retries; attempt++) {
            try {
                // HTTP Equivalent: GET /api/v2/scim/v2/Groups/{groupId}
                // Headers: Authorization: Bearer <token>, Accept: application/json
                ScimGroup group = scimApi.getScimGroupsGroupId(groupId);
                
                if (group == null || group.getId() == null) {
                    throw new IllegalArgumentException("Invalid SCIM group response format");
                }
                return group;
            } catch (ApiException e) {
                if (e.getCode() == 429 && attempt < retries) {
                    auditLog.add(String.format("[%s] RATE_LIMITED: group=%s, retry=%d", Instant.now().toString(), groupId, attempt));
                    Thread.sleep(backoffMs);
                    backoffMs *= 2;
                } else {
                    failureCount.incrementAndGet();
                    auditLog.add(String.format("[%s] FETCH_FAILURE: group=%s, status=%d, error=%s", 
                            Instant.now().toString(), groupId, e.getCode(), e.getMessage()));
                    throw e;
                }
            }
        }
        throw new RuntimeException("Max retries exceeded for group " + groupId);
    }

    private ScimUser fetchUserWithRetry(String userId) throws Exception {
        int retries = 3;
        long backoffMs = 1000;
        
        for (int attempt = 1; attempt <= retries; attempt++) {
            try {
                // HTTP Equivalent: GET /api/v2/scim/v2/Users/{userId}
                ScimUser user = scimApi.getScimUsersUserId(userId);
                if (user == null || user.getId() == null) {
                    throw new IllegalArgumentException("Invalid SCIM user response format");
                }
                return user;
            } catch (ApiException e) {
                if (e.getCode() == 429 && attempt < retries) {
                    Thread.sleep(backoffMs);
                    backoffMs *= 2;
                } else {
                    failureCount.incrementAndGet();
                    throw e;
                }
            }
        }
        throw new RuntimeException("Max retries exceeded for user " + userId);
    }

The retry loop implements exponential backoff for HTTP 429 responses. The format verification checks for null objects and missing identifiers. The ApiException class captures status codes and response bodies for audit logging.

Step 4: Validation Pipeline & Role Inheritance

Genesys Cloud assigns roles to users and groups. Flattening must verify role inheritance to ensure access control remains accurate. Orphan node verification identifies groups that reference users or subgroups that no longer exist in the directory.

    public void validateHierarchy(String rootGroupId) throws Exception {
        auditLog.add(String.format("[%s] VALIDATE_START: group=%s", Instant.now().toString(), rootGroupId));
        
        ScimGroup rootGroup = fetchGroupWithRetry(rootGroupId);
        
        // Role inheritance checking
        if (rootGroup.getRoles() != null && !rootGroup.getRoles().isEmpty()) {
            auditLog.add(String.format("[%s] ROLE_INHERITANCE: group=%s, roles=%s", 
                    Instant.now().toString(), rootGroupId, rootGroup.getRoles().toString()));
            
            for (com.mypurecloud.sdk.v2.model.ScimRole role : rootGroup.getRoles()) {
                // Verify role exists and is active in Genesys Cloud
                if (role.getDisplayName() == null || role.getDisplayName().isEmpty()) {
                    throw new IllegalStateException(String.format("Invalid role configuration in group %s: %s", rootGroupId, role));
                }
            }
        }
        
        // Orphan node verification pipeline
        Set<String> validUserIds = new HashSet<>();
        for (ScimUser user : flatMemberMatrix.getOrDefault(rootGroupId, Collections.emptyList())) {
            validUserIds.add(user.getId());
        }
        
        // Check referenced IDs against resolved matrix
        for (String groupId : visitedGroups) {
            List<ScimUser> members = flatMemberMatrix.get(groupId);
            if (members == null) continue;
            
            for (ScimUser user : members) {
                if (!validUserIds.contains(user.getId())) {
                    auditLog.add(String.format("[%s] ORPHAN_NODE_DETECTED: group=%s, user=%s", 
                            Instant.now().toString(), groupId, user.getId()));
                }
            }
        }
        
        auditLog.add(String.format("[%s] VALIDATE_COMPLETE: group=%s", Instant.now().toString(), rootGroupId));
    }

The validation method checks role configurations and compares resolved user IDs against the expected matrix. Orphan nodes occur when a group references a user ID that fails to resolve or does not appear in the final flattened list. The pipeline throws an exception for invalid role states and logs orphan references for manual review.

Step 5: Metrics, Audit Logging & Webhook Sync

External IAM directories require synchronization events. You register a webhook via the Genesys Cloud Webhook API, then emit a flattened payload when the hierarchy resolves. The metrics tracker records latency and success rates for operational monitoring.

    public void syncWithExternalIAM(String webhookUrl, String rootGroupId) throws Exception {
        com.mypurecloud.sdk.v2.api.WebhookApi webhookApi = new com.mypurecloud.sdk.v2.api.WebhookApi(Configuration.getDefaultApiClient());
        
        // Register webhook if not already present
        com.mypurecloud.sdk.v2.model.Webhook webhook = new com.mypurecloud.sdk.v2.model.Webhook()
                .name("SCIM Hierarchy Flattener Sync")
                .description("Synchronizes flattened group memberships with external IAM")
                .enabled(true)
                .url(webhookUrl)
                .method("POST")
                .contentType("application/json")
                .events(Collections.singletonList("scim.group.flattened"));
                
        try {
            webhookApi.postWebhooksWebhook(webhook);
        } catch (ApiException e) {
            if (e.getCode() != 409) throw e; // Ignore duplicate webhook registration
        }
        
        // Construct sync payload
        Map<String, Object> payload = new HashMap<>();
        payload.put("timestamp", Instant.now().toString());
        payload.put("rootGroupId", rootGroupId);
        payload.put("totalGroupsResolved", visitedGroups.size());
        payload.put("successRate", (double) successCount.get() / (successCount.get() + failureCount.get()));
        payload.put("latencyMs", Duration.between(startTime, Instant.now()).toMillis());
        payload.put("memberMatrix", flatMemberMatrix);
        
        // Emit webhook event (simulated via direct HTTP post for external sync)
        java.net.http.HttpClient httpClient = java.net.http.HttpClient.newHttpClient();
        java.net.http.HttpRequest request = java.net.http.HttpRequest.newBuilder()
                .uri(java.net.URI.create(webhookUrl))
                .header("Content-Type", "application/json")
                .header("X-Genesys-Event", "SCIM.HIERARCHY.FLATTENED")
                .POST(java.net.http.HttpRequest.BodyPublishers.ofString(
                        com.fasterxml.jackson.databind.ObjectMapper.getDefault().writeValueAsString(payload)))
                .build();
                
        httpClient.send(request, java.net.http.HttpResponse.BodyHandlers.ofString());
        auditLog.add(String.format("[%s] WEBHOOK_SYNCED: url=%s, payloadSize=%d", Instant.now().toString(), webhookUrl, payload.size()));
    }

The webhook registration uses the WebhookApi. The sync payload includes the flattened matrix, latency, and success metrics. The HTTP client posts the payload to the external IAM endpoint with a custom event header.

Complete Working Example

import com.mypurecloud.sdk.v2.ApiClient;
import com.mypurecloud.sdk.v2.api.ScimApi;
import com.mypurecloud.sdk.v2.auth.OAuth;
import com.mypurecloud.sdk.v2.client.Configuration;
import com.mypurecloud.sdk.v2.client.ApiException;

import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.time.Instant;
import java.time.Duration;

public class ScimHierarchyFlattener {
    private final ScimApi scimApi;
    private final int maxDepth;
    private final Set<String> visitedGroups = Collections.synchronizedSet(new HashSet<>());
    private final Map<String, List<com.mypurecloud.sdk.v2.model.ScimUser>> flatMemberMatrix = Collections.synchronizedMap(new HashMap<>());
    
    private final Instant startTime = Instant.now();
    private final AtomicInteger successCount = new AtomicInteger(0);
    private final AtomicInteger failureCount = new AtomicInteger(0);
    private final List<String> auditLog = Collections.synchronizedList(new ArrayList<>());

    public ScimHierarchyFlattener(ScimApi scimApi, int maxDepth) {
        this.scimApi = scimApi;
        this.maxDepth = maxDepth;
    }

    public FlattenResult flattenHierarchy(String rootGroupId) throws Exception {
        visitedGroups.clear();
        flatMemberMatrix.clear();
        auditLog.add(String.format("[%s] INITIATE FLATTEN: rootGroup=%s, maxDepth=%d", 
                Instant.now().toString(), rootGroupId, maxDepth));
        
        resolveGroupMembers(rootGroupId, 0);
        
        long latencyMs = Duration.between(startTime, Instant.now()).toMillis();
        int totalCalls = successCount.get() + failureCount.get();
        double successRate = totalCalls > 0 ? (double) successCount.get() / totalCalls : 0.0;
        
        auditLog.add(String.format("[%s] COMPLETE FLATTEN: latency=%dms, successRate=%.2f%%, totalGroups=%d",
                Instant.now().toString(), latencyMs, successRate * 100, visitedGroups.size()));
                
        return new FlattenResult(flatMemberMatrix, auditLog, latencyMs, successRate);
    }

    private void resolveGroupMembers(String groupId, int currentDepth) throws Exception {
        if (currentDepth > maxDepth) {
            auditLog.add(String.format("[%s] DEPTH_LIMIT_EXCEEDED: group=%s, depth=%d", Instant.now().toString(), groupId, currentDepth));
            throw new IllegalStateException(String.format("Maximum traversal depth %d exceeded for group %s", maxDepth, groupId));
        }
        
        if (visitedGroups.contains(groupId)) {
            auditLog.add(String.format("[%s] CYCLE_DETECTED: group=%s, aborting recursion", Instant.now().toString(), groupId));
            return;
        }
        
        visitedGroups.add(groupId);
        ScimGroup group = fetchGroupWithRetry(groupId);
        
        if (group.getMembers() == null || group.getMembers().isEmpty()) {
            auditLog.add(String.format("[%s] EMPTY_MEMBERS: group=%s", Instant.now().toString(), groupId));
            return;
        }
        
        List<com.mypurecloud.sdk.v2.model.ScimUser> expandedMembers = new ArrayList<>();
        
        for (com.mypurecloud.sdk.v2.model.ScimMember member : group.getMembers()) {
            if (member.getType() != null && member.getType().equals("Group")) {
                resolveGroupMembers(member.getValue(), currentDepth + 1);
                if (flatMemberMatrix.containsKey(member.getValue())) {
                    expandedMembers.addAll(flatMemberMatrix.get(member.getValue()));
                }
            } else if (member.getType() != null && member.getType().equals("User")) {
                expandedMembers.add(fetchUserWithRetry(member.getValue()));
            }
        }
        
        Set<String> seenUserIds = new HashSet<>();
        List<com.mypurecloud.sdk.v2.model.ScimUser> deduplicatedMembers = new ArrayList<>();
        for (com.mypurecloud.sdk.v2.model.ScimUser u : expandedMembers) {
            if (seenUserIds.add(u.getId())) {
                deduplicatedMembers.add(u);
            }
        }
        
        flatMemberMatrix.put(groupId, deduplicatedMembers);
        successCount.incrementAndGet();
    }

    private ScimGroup fetchGroupWithRetry(String groupId) throws Exception {
        int retries = 3;
        long backoffMs = 1000;
        for (int attempt = 1; attempt <= retries; attempt++) {
            try {
                ScimGroup group = scimApi.getScimGroupsGroupId(groupId);
                if (group == null || group.getId() == null) throw new IllegalArgumentException("Invalid SCIM group response");
                return group;
            } catch (ApiException e) {
                if (e.getCode() == 429 && attempt < retries) {
                    Thread.sleep(backoffMs);
                    backoffMs *= 2;
                } else {
                    failureCount.incrementAndGet();
                    throw e;
                }
            }
        }
        throw new RuntimeException("Max retries exceeded for group " + groupId);
    }

    private com.mypurecloud.sdk.v2.model.ScimUser fetchUserWithRetry(String userId) throws Exception {
        int retries = 3;
        long backoffMs = 1000;
        for (int attempt = 1; attempt <= retries; attempt++) {
            try {
                com.mypurecloud.sdk.v2.model.ScimUser user = scimApi.getScimUsersUserId(userId);
                if (user == null || user.getId() == null) throw new IllegalArgumentException("Invalid SCIM user response");
                return user;
            } catch (ApiException e) {
                if (e.getCode() == 429 && attempt < retries) {
                    Thread.sleep(backoffMs);
                    backoffMs *= 2;
                } else {
                    failureCount.incrementAndGet();
                    throw e;
                }
            }
        }
        throw new RuntimeException("Max retries exceeded for user " + userId);
    }

    public record FlattenResult(Map<String, List<com.mypurecloud.sdk.v2.model.ScimUser>> matrix, 
                                List<String> auditLog, long latencyMs, double successRate) {}

    public static void main(String[] args) {
        try {
            ApiClient client = new ApiClient();
            client.setBasePath("https://api.mypurecloud.com");
            client.setAuth(new OAuth.Builder().clientId("YOUR_CLIENT_ID").clientSecret("YOUR_CLIENT_SECRET").build());
            Configuration.setDefaultApiClient(client);
            
            ScimApi scimApi = new ScimApi(client);
            ScimHierarchyFlattener flattener = new ScimHierarchyFlattener(scimApi, 10);
            
            FlattenResult result = flattener.flattenHierarchy("YOUR_ROOT_GROUP_ID");
            
            System.out.println("Flattening Complete.");
            System.out.println("Latency: " + result.latencyMs() + "ms");
            System.out.println("Success Rate: " + result.successRate());
            result.auditLog().forEach(System.out::println);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Common Errors & Debugging

Error: 401 Unauthorized

• What causes it: The OAuth token expired or the service account lacks the scim:group:read scope.
• How to fix it: Verify the client credentials in the Genesys Cloud admin console. Ensure the scope string matches exactly. The SDK refreshes tokens automatically, but initial authentication must succeed.
• Code showing the fix:

try {
    client.getOAuthApi().postOAuthTokenClientCredentials(
        new com.mypurecloud.sdk.v2.model.OAuthClientCredentials()
            .scope("scim:group:read scim:user:read")
    );
} catch (ApiException e) {
    System.err.println("Authentication failed: " + e.getMessage());
}

Error: 403 Forbidden

• What causes it: The service account does not have SCIM access enabled in the organization settings, or the group ID belongs to a different environment.
• How to fix it: Navigate to Admin > Security > Service Accounts and enable SCIM permissions. Verify the environment URL matches the target group region.
• Code showing the fix:

// Verify environment match before API call
if (!groupId.startsWith("env-")) {
    throw new IllegalArgumentException("Group ID format mismatch for current environment");
}

Error: 429 Too Many Requests

• What causes it: Rapid recursive API calls exceed the SCIM endpoint rate limit (typically 50 requests per second).
• How to fix it: The retry logic implements exponential backoff. Add a fixed delay between recursive calls if traversing large hierarchies.
• Code showing the fix:

Thread.sleep(100); // Rate limit buffer between recursive calls
resolveGroupMembers(member.getValue(), currentDepth + 1);

Error: StackOverflowError

• What causes it: Circular group references bypass the cycle detection due to concurrent modification or missing visitedGroups checks.
• How to fix it: Ensure the visitedGroups set is checked before every API call. Use Collections.synchronizedSet for thread safety.
• Code showing the fix:

if (!visitedGroups.add(groupId)) {
    return; // Group already processed
}

Official References

• Genesys Cloud SCIM API Documentation
• Genesys Cloud Java SDK Reference
• SCIM 2.0 Group Schema Specification
• Genesys Cloud OAuth Client Credentials Flow