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 Introduction The KIE Server is the core runtime component of jBPM , responsible for executing BPMN processes, DMN decisions, and rules. One of the most common production and local-setup issues developers face is: ❌ KIE Server fails to start or becomes unreachable This problem can occur due to configuration issues, dependency mismatches, port conflicts, database errors, or authentication misconfiguration . In this blog, we will walk through: Common symptoms Root causes Step-by-step troubleshooting Best practices to prevent future failures Common Symptoms You may encounter one or more of the following: KIE Server starts but shuts down immediately Server starts but /kie-server/services/rest/server returns 404 / 401 WildFly / EAP starts but KIE Server is not registered Containers fail to deploy Errors in startup logs related to KIE Server Step 1: Check Server Startup Logs (Most Important) Always start with the server logs . For WildFly / ...

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...