How can custom Java code be executed within a YAWL workflow?This video explains how YAWL workflows can be extended with custom Java code through the use of codelets. The tutorial introduces the concept of codelets as executable Java components that can be invoked from within a YAWL workflow. It demonstrates how to create a simple Java codelet using NetBeans, compile it into a JAR file, and deploy it into the YAWL environment. Configuration steps, including updating the web.xml file, are shown to ensure the YAWL engine can locate and execute the codelet. A step-by-step walkthrough illustrates how the codelet is loaded into the YAWL editor, integrated into a workflow model, and executed at runtime. The example uses a simple random-number generator to verify correct execution and data flow between the workflow and the Java code. This tutorial highlights how YAWL supports extensibility and integration with external logic, enabling workflow-based orchestration of custom programmatic functionality. This tutorial is part of the playlist “Learn how to automate business processes with YAWL (ADVANCED)”:https://www.youtube.com/playlist?list=PL4BZgFsmRzfQ9QpXfqLC7uBTMS12C5MQR Supplementary material, including the Java code and YAWL models used in this tutorial, is available on GitHub:https://github.com/ahense/YAWL (Download via “Code” → “Download ZIP”. The material is located in the folder corresponding to the tutorial number.) This is video #26 of the YAWLSeries. Timestamps:- 0:00 – Introduction- 0:27 – Codelets- 1:24 – Creating a NetBeans project- 2:56 – Compiling the codelet- 3:27 – Deploying the JAR file- 3:59 – Editing the web.xml file- 5:34 – Loading the codelet in the YAWL editor- 7:24 – Walkthrough of a workflow case- 8:30 – Conclusion The video is hosted on YouTube:https://youtu.be/lF-WvxnJNnY