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Introduction In jBPM , not all business logic can be modeled using BPMN elements alone. Whenever a process needs to: Call an external service Execute custom Java logic Integrate with Spring beans Perform non-standard operations we use a WorkItemHandler . This blog explains what a WorkItemHandler is , when to use it , and shows a complete working example using Spring Boot + jBPM . What Is a WorkItemHandler in jBPM? A WorkItemHandler is a Java component that: Executes custom logic for a BPMN Service Task Receives inputs from the process Returns results back to the process It acts as a bridge between BPMN and Java/Spring code . When Should You Use a WorkItemHandler? ✔ Calling REST / SOAP services ✔ Sending emails or notifications ✔ Database or legacy system calls ✔ Custom validations ✔ Integration with Spring services ❌ Avoid using it for simple logic (use Script Tasks instead) Architecture Overview Spring Boot Application | jBPM...