Camunda DMN Boolean Error in Production – Root Cause and Fix
One of the most common Camunda DMN issues seen in production environments is the infamous Boolean evaluation error , where a decision table fails with a message indicating that a condition did not return a Boolean value . This problem often: Does not appear in development Surfaces suddenly after deployment Blocks process execution in production In this blog, we’ll cover: The exact root causes of this issue Why it appears unexpectedly in production Proven fixes used in real projects đź”´ Typical Error Message You may see an error similar to: Cannot evaluate expression: condition expression returns non - Boolean : result has class java.lang.String and not java.lang.Boolean or FEEL expression did not return a Boolean result This usually occurs when: A process reaches a DMN decision task A decision table condition is evaluated Camunda expects true or false , but receives something else 🧠Root Cause Analysis (Most Important Section) ...