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 If your jBPM application throws a DMN execution error in production , such as DMNRuntimeException , Decision evaluation failed , or NullPointerException inside a decision table, the root cause is almost always data issues, model deployment mismatches, or environment-specific configuration problems . In this guide, you will learn: why jBPM DMN fails in production the most common root causes how to debug and fix DMN execution errors step by step best practices to prevent DMN failures in production 🔍 What Is a jBPM DMN Execution Error? A DMN execution error occurs when the jBPM engine cannot evaluate a decision model at runtime. Typical symptoms: Process instance fails at a Business Rule Task Decision evaluation failed DMNRuntimeException NullPointerException Incorrect or missing output variables Once this happens: the process may abort the transaction may roll back business flow becomes inconsistent 📊 Diagram 1: How jBPM Executes...

 Introduction One of the most common and dangerous issues in DMN-based systems is a Boolean evaluation error in production . These errors often do not appear in local testing but suddenly break workflows after deployment. Typical symptoms include: DMN decision fails at runtime Process instance stuck or aborted Unexpected false decision output Runtime exceptions like: FEEL evaluation error Boolean expected but got null Cannot coerce value to Boolean This blog explains: What DMN Boolean errors are Why they happen in production Real root causes (from live systems) How to fix and prevent them What Is a DMN Boolean Error? In DMN, Boolean logic is used in: Input Expressions Decision Table conditions Literal Expressions FEEL expressions A Boolean error occurs when: DMN expects true or false But receives null , empty, wrong type, or invalid expression This leads to decision failure or wrong routing in BPMN processes...