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 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 🔴 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) ...

When working with jBPM REST APIs , one of the most common and frustrating problems developers face is serialization errors while starting a process or passing variables . These issues usually appear only at runtime , often in integration or production environments , making them harder to debug. In this article, we’ll understand: Why jBPM REST serialization issues occur Common error messages Practical solutions that actually work in real projects 🔴 Common Error Messages You may encounter errors like: Cannot find serializer for value 'ObjectValue [...]' or Cannot write serialized value for variable 'body' : no 'objectTypeName' provided for non- null value or Unable to deserialize content as ObjectValue These errors usually happen when: Starting a process instance Completing a task Passing complex JSON or Java objects via REST 🧠 Root Causes (Very Important) 1️⃣ Passing JSON as a Plain String A very common mistake is sending JSON l...

DMN vs Drools – Quelle technologie de règles choisir et quand ? (Guide Complet) Dans l’écosystème Java BPM et règles métier, DMN et Drools sont deux solutions puissantes, mais fondamentalement différentes . Les questions fréquentes sont : Faut-il utiliser DMN ou Drools ? Peuvent-ils être utilisés ensemble ? Lequel est le plus lisible pour le métier ? Lequel est le plus puissant pour des règles complexes ? Ce guide répond clairement à ces questions, avec exemples concrets , cas d’usage et comparaison détaillée . ⭐ 1. Qu’est-ce que DMN? DMN (Decision Model and Notation) est un standard OMG destiné à modéliser et exécuter des décisions métier . Caractéristiques clés de DMN: ✔ Visuel et orienté métier ✔ Tables de décision, expressions FEEL ✔ Séparation claire processus / décision ✔ Très facile à auditer et expliquer ✔ Accessible aux utilisateurs métier et développeurs Cas d’usage typiques : Approbation de prêt Vérification d’éligibilité Calcul de ta...

DMN vs Drools – Which Rules Engine Should You Use and When? (Complete Comparison Guide) In the Java BPM and rules ecosystem, DMN and Drools are two powerful but very different ways to implement business rules. Many teams ask: Should we use DMN or Drools ? Can they be used together? Which one is better for business users? Which one scales better for complex logic? This blog gives a clear, no-confusion answer with examples, use cases, and a comparison table . ⭐ 1. What is DMN? DMN (Decision Model and Notation) is a standard (OMG) for modeling and executing business decisions . Key characteristics of DMN: ✔ Visual, business-friendly ✔ Decision tables, literal expressions, FEEL ✔ Clear separation of process and decision ✔ Easy to audit and explain ✔ Designed for business users + developers Typical DMN use cases: Loan approval Eligibility checks Pricing rules Risk categorization Compliance decisions ⭐ 2. What is Drools? Drools is a pow...

In Camunda 8 , all work is executed outside the workflow engine . There are two main ways to integrate external systems and execute logic: Camunda 8 Connectors (pre-built, configuration-driven) Camunda 8 Job Workers (custom code-based workers) Both are built on top of Zeebe's job mechanism , but they serve very different purposes . This blog explains: What Connectors and Workers are How they work internally Key differences Real-world examples When to use Connectors vs Workers Best practices ⭐ 1. Big Picture: Execution Model in Camunda 8 Camunda 8 is: Cloud-native Event-driven Asynchronous only 👉 The engine never executes business logic itself. 👉 All work is done by external executors . Both Connectors and Workers are: External Asynchronous Decoupled from the engine Scalable ⭐ 2. What Are Camunda 8 Connectors? Connectors are pre-built integration components provided by Camunda. They allow you to connect BP...