The External Class node () runs the main method of an external compiled Java class file. To add this node, right-click the Parametric Sweep (Job Configurations), Batch (Job Configurations), Function Sweep (Job Configurations), Material Sweep (Job Configurations), or Sequence node and select it from the Other submenu.

Before the external class is called, the system property cs.currentmodel is set to the name of the model that is calling the external class. You can set the name of the class file in the Filename field. Arguments can be passed to the main method with Input.