Refering to the PDF file available for oaw 4.2 there is a minor bug in the script:
Section 6.5.5.1 Main Configuration (for the Generator workflow component) reads:
The first thing to note, is that the qualified Java name of the component is
org.openarchitectureware.xpand2.Generator2. One can use the shortcut oaw instead of a preceding
org.openarchitectureware. The workflow engine will resolve it.
Correctly it should read: org.openarchitectureware.xpand2.Generator without the "2" at the end of the class name.