Error Handling in Workflows (Incidents, Retries, Compensation in Camunda 8)
Introduction
In workflow-driven systems, failures are not exceptions—they are expected.
With Camunda 8 Official Documentation error handling is built into the engine using incidents, retries, and BPMN-based compensation patterns.
This blog covers:
- Incident handling in Camunda 8
- Retry mechanisms (job-level resilience)
- Compensation patterns in workflows
- Production-ready error handling strategies
🧠 Understanding Errors in Camunda 8
Types of Errors:
- Technical Errors → API failure, DB issues
- Business Errors → Validation failures, rules
👉 Camunda does not automatically handle all errors — you must design handling logic in BPMN.
⚠️ Incidents in Camunda 8
What is an Incident?
An incident occurs when a workflow cannot proceed and is stuck at a step.
When are Incidents Created?
- Job retries exhausted
- Invalid variables
- Decision evaluation failure
- Unhandled BPMN error
🔴 Example Flow:
- Service task calls external API
- API fails
- Retries exhausted
- Incident created → workflow stops
👉 Incident requires manual intervention via Operate.
🔧 Resolving Incidents:
- Fix root cause
- Update variables if needed
- Increase retries
- Resume execution
🔁 Retry Mechanism (Core Resilience)
How Retry Works:
- Each service task creates a job
- Worker processes job
- On failure → retries decrease
- If retries = 0 → incident
👉 Default retries = 3 attempts
🔹 Retry Configuration (BPMN)
<zeebe:taskDefinition type="payment-service" retries="5" />
👉 Retry count can be defined per task.
🔹 Retry Best Practices:
- Use retries for transient errors only
- Add backoff delay
- Avoid infinite retries
👉 Systems may apply backpressure and require delayed retry in overload cases
🔄 Compensation Pattern (Business Recovery)
What is Compensation?
Compensation is used to undo previously completed steps in a workflow.
👉 Example:
- Step 1: Create Order ✅
- Step 2: Payment Failed ❌
- Compensation: Cancel Order
🔹 BPMN Elements:
- Compensation Event
- Compensation Handler
- Error Boundary Events
🔹 When to Use Compensation:
- Distributed transactions (Saga pattern)
- Multi-step workflows
- Business rollback scenarios
👉 Compensation ensures business consistency without DB rollback.
⚙️ End-to-End Error Handling Strategy
🔹 1. Handle Technical Errors (Retry)
- API failure → retry
- Timeout → retry
🔹 2. Handle Business Errors (BPMN)
- Use Error Boundary Events
- Route to alternate flow
🔹 3. Handle Critical Failures (Incident)
- Stop process
- Fix manually
- Resume execution
🔹 4. Use Compensation for Rollback
- Undo completed steps
- Maintain consistency
🛡️ Production Best Practices
✔ Design Idempotent Workers
- Retry-safe logic
- Avoid duplicate processing
✔ Separate Error Types
- Technical → Retry
- Business → BPMN flow
✔ Monitor via Operate
- Track incidents
- Debug failures
- Retry processes
✔ Avoid Retry Storms
- Use exponential backoff
- Limit retry attempts
🧩 Real-World Use Cases
- Payment processing workflows
- Loan approval systems
- Insurance claims processing
- Order management systems
👉 These require retry + compensation + incident handling together.
🚀 Recommended Articles
🏁 Conclusion
Error handling in Camunda 8 requires a layered strategy:
- Retries → for transient failures
- Incidents → for critical blocking issues
- Compensation → for business rollback
👉 Together, these patterns ensure resilient, fault-tolerant workflows in production.
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