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 Camunda Optimistic Locking Exception — Root Cause & Fix 4 Introduction If you work with Camunda BPM , sooner or later you will encounter an error called OptimisticLockingException . Many developers panic when they see this exception in logs, assuming something is broken in the workflow engine. In reality, this exception is a normal concurrency protection mechanism used by Camunda to maintain consistent process data. In this article we will cover: What Camunda Optimistic Locking Exception is The real root causes Common scenarios where it occurs Practical fixes and best practices What is Optimistic Locking in Camunda? Camunda uses optimistic locking to prevent multiple transactions from modifying the same database row at the same time. When two transactions try to update the same record simultaneously, Camunda detects the conflict and throws an OptimisticLockingException instead of allowing inconsistent data to be saved. This mechanism ensures that: Process state remains con...

 In BPMN , Error Events and Escalation Events are often confused because both are used to react to exceptional situations. However, they serve very different purposes and using the wrong one can lead to incorrect process behavior in production . This article explains: What Error Events are What Escalation Events are Key differences Real business examples Best practices (based on Camunda 7 projects) 1️⃣ BPMN Error Event – For Technical or Business Failures 🔹 What is an Error Event? An Error Event represents a failure that stops the normal flow of execution. When an Error Event is thrown: The current transaction is rolled back Normal process flow is interrupted Control is transferred to the nearest matching Error Boundary Event 🧩 Real Example: Payment Failure Scenario Customer submits payment Payment gateway fails Process must stop and go to an error handling path Implementation throw new BpmnError ( "PAYMENT_FAILED" ); BPMN Behavior Transaction is rolled back Erro...