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Authenticate a backend service to a Guidewire Cloud tenant using OAuth2 client credentials and operate the auth layer in production. This is not a hello-world walkthrough; it is the auth code your service runs at 3am when a token expires mid-batch, when a tenant admin rotates a scope, when a private CA renews a cert, and when on-call needs to swap a leaked secret without dropping in-flight requests.
The four production failures this skill prevents:
Token expiry storms — every request races to refresh, the Hub rate-limits the auth endpoint, the integration cascades to red.
Scope drift — a GCC admin removes a scope, every cached token starts returning 403, retrying does not help.
PKIX path building failed — JVM cannot validate the tenant's TLS chain because the private CA is not in the trust store; common when carriers front Cloud API with their own DLP appliance.
Secret rotation downtime — the active client secret is rotated and the old secret stops working before the new one is loaded; in-flight token refreshes fail until restart.
Prerequisites
JDK 17 (Guidewire Cloud release 202503 and later)
A registered Service Application in Guidewire Cloud Console (GCC) with Cloud API roles assigned per least privilege
Network egress from your runtime to *.guidewire.net (runtime APIs) and gcc.guidewire.com (console only)
A secret store the runtime can read at startup and on rotation signal (AWS Secrets Manager, GCP Secret Manager, HashiCorp Vault, or Kubernetes Secret with CSI driver)
For private-CA tenants: the carrier's CA chain in PEM form
Instructions
Build the auth layer in this order. Each section solves one production failure mode; do not skip steps because the failure shows up in production, not in dev.
Wire secret rotation to your secret store; do not commit secrets or bake them into images.
For private-CA tenants, install the trust store at the JVM/init-container layer.
Validate scope hardening on every refresh so drift fails fast, not on the next business call.
Token-cache pattern (production)
Tokens are short-lived, typically one hour. Reactive refresh on 401 is wrong: it doubles latency on the failing request and creates a thundering herd when many requests notice expiry simultaneously. Cache the token in-process and refresh at 80% of TTL, behind a single-flight gate so concurrent refreshers serialize.
The exp - 20% early-refresh window absorbs clock skew and prevents the cliff at TTL boundary. The inflight single-flight gate makes a high-rps service issue one refresh per cache-miss, not one per concurrent request — without it, a 1000-rps service produces 1000 simultaneous Hub calls and trips 429 rate-limiting on the auth endpoint.
Secret rotation without downtime
Rotation breaks if the runtime reads the secret only at startup, or if the plaintext lives somewhere reviewable (committed .env, container image layer, unencrypted Kubernetes Secret). Three patterns work, in order of operational simplicity:
SOPS + age (recommended for VM/container deployments). Encrypt secrets.prod.sops.yaml with one or more age public keys, commit the encrypted file to git, decrypt in-process at startup and on SIGHUP. The repo holds an auditable history of who rotated what and when; only holders of the age private key can read plaintext. Bootstrap a repo with the same conventions used across this organization:
sops-init # idempotent; writes .sops.yaml + .env.sops + scripts/sops-env
sops secrets.prod.sops.yaml # interactive edit; ciphertext re-written on save
eval "$(sops -d secrets.prod.sops.yaml | sed -nE 's/^([A-Za-z_][A-Za-z0-9_]*)=(.*)$/export \1=\2/p')"
The anchored sed regex is non-negotiable: a naive sed 's/^/export /' turns blank lines and comments into bare export calls, and bare export dumps every exported variable to stdout — every secret leaks if anything captures that stdout (cron mail, an SSH session running this).
Cloud-native projection (managed Kubernetes / cloud VMs). Mount the secret as a file from the secret store via Vault Agent, the Secrets Store CSI driver, or AWS Secrets and Configuration Provider. The orchestrator handles restart-on-rotation and the runtime re-reads the file on each token refresh.
Dual-secret env-var window (manual rotation, last resort). Configure the runtime with both GW_CLIENT_SECRET_PRIMARY and GW_CLIENT_SECRET_SECONDARY. On invalid_client from the primary, fall back to the secondary; on success, schedule the swap. Close the window when monitoring confirms 24h of zero primary failures.
Private-CA trust store setup (PKIX)
When a carrier fronts Cloud API with a DLP appliance or proxy that re-signs TLS with a private CA, the JVM rejects the chain. Symptom: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException.
For Kubernetes deployments, bake the CA into a sidecar that runs keytool against a shared cacerts volume, or use JAVA_OPTS=-Djavax.net.ssl.trustStore=/etc/ssl/cacerts.jks. Do not disable validation with -Dcom.sun.net.ssl.checkRevocation=false or trust-all SSL contexts; the OWASP A02 audit will find that too.
Scope hardening
Assign roles per least privilege under GCC > Identity & Access > Applications > [your-app] > Permissions. A read-only reporting integration should not hold pc.account.write; a webhook consumer should not hold pc.policy.bind. Scope strings are tenant-configured and vary across environments, so do not hard-code them — read from GW_SCOPES and validate at startup that the issued token contains the expected scopes:
Run this check on every token refresh. It catches scope drift the moment a tenant admin removes a permission, instead of letting it surface as 403 on the next business call.
Output
A production-grade auth layer ships with all of the following:
A token cache with proactive refresh (80% TTL), single-flight gate, and JWT-based expiry calculation rather than fixed 3600s assumption.
Secret loading from a runtime-readable secret store (CSI / Vault Agent / dual-secret env), not a .env file or container image.
JVM trust store containing the tenant's CA chain when applicable, configured at the JVM or sidecar layer rather than at application startup.
Scope-drift detection on every refresh, failing fast on missing required scopes.
Structured logs distinguishing invalid_client, invalid_scope, expired token, and PKIX failures — recognizable in the observability dashboard before they cascade.
Examples
Example 1 — Production token-cache module (TypeScript)
The getToken() snippet above is the canonical implementation. Drop it into the integration's auth module and call it from every Cloud API request wrapper. Validates against scope drift on each refresh; absorbs Hub-side 5xx with retry-once.
Example 2 — SOPS + age rotation (Bash)
# Edit the encrypted file in-place; sops handles re-encryption transparently
sops secrets.prod.sops.yaml # change GW_CLIENT_SECRET_SECONDARY to the newly issued value
git add secrets.prod.sops.yaml && git commit -m "rotate(gw): issue secondary client secret"# In the runtime startup or SIGHUP handler — anchored regex prevents bare-export leakeval"$(sops -d secrets.prod.sops.yaml | sed -nE 's/^([A-Za-z_][A-Za-z0-9_]*)=(.*)$/export \1=\2/p')"# Monitor: zero invalid_client failures from primary for 24h, then promote secondary → primary
Example 3 — PKIX recovery for private-CA tenant
# Pull the tenant's chain straight from the endpointecho | openssl s_client -connect "[TENANT].guidewire.net:443" -servername "[TENANT].guidewire.net" -showcerts 2>/dev/null \
| sed -ne '/BEGIN CERTIFICATE/,/END CERTIFICATE/p' > tenant-chain.pem
# Import into JVM trust store (do this in the Dockerfile or init container, not at runtime)
keytool -importcert -alias gw-tenant-ca -file tenant-chain.pem \
-keystore "$JAVA_HOME/lib/security/cacerts" -storepass changeit -noprompt
Error Handling
Error
Cause
Solution
invalid_client (400 from /oauth/token)
wrong client_id/client_secret, or app disabled in GCC
verify in GCC > Identity & Access > Applications; if mid-rotation, fall back to secondary secret per dual-secret pattern
invalid_scope (400 from /oauth/token)
requested scope not granted to this app, or tenant admin removed it
scope-drift check on every refresh catches this immediately; alert and re-issue from GCC
401 Unauthorized (from Cloud API)
token expired before next refresh window
indicates clock skew or aggressive proxy caching; tighten the early-refresh window from 20% to 30%
403 Forbidden (from Cloud API)
token valid but app lacks the role for that resource
least-privilege violation surfaced — assign the role in GCC, do not retry
409 Conflict (from PATCH/POST)
stale checksum on the resource
not an auth error — covered in guidewire-sdk-patterns
PKIX path building failed
private-CA cert chain missing from JVM trust store
import per the trust-store section above; fix at JVM/init-container layer, not in code
ENOTFOUND [TENANT].guidewire.net
DNS or firewall blocking egress to runtime API domain
confirm *.guidewire.net egress; runtime APIs are NOT on *.guidewire.com (that is the console)
429 Too Many Requests from Hub /oauth/token
thundering herd refresh from token cache without single-flight
the inflight gate in the token-cache pattern prevents this; verify it's active
For deeper coverage (M2M vs delegated flows, mTLS-fronted tenants, multi-region failover, GCC scope auditing), see implementation guide and API reference.
See Also
guidewire-sdk-patterns — wraps this auth into a retrying, rate-limit-aware Cloud API client; handles checksum-based optimistic locking
guidewire-security-and-rbac — secret storage architecture, least-privilege role design, audit capture, PII redaction in logs
guidewire-observability-and-incident-response — triage trees and recovery playbooks for 401 spikes, scope drift, and PKIX cascades in production
guidewire-ci-cd-pipeline — credential rotation across promoted environments without breaking running deployments
