[Windchill] How to generate mData

Steps.
1. open rose
2. Tools --> Windchill --> System Generation
3. Click OK

Troubleshoot
It may show generation refuse error in the progress of system generation
Error: wt.templateutil.processor.DefaultTemplateProcessor is not Extendable, so cannot extend it.

Solution
1. Open user.properties (under /Codebase)
2. add one attribute wihch named wt.generation.overrideNonExtendableClasses, and add classes which we want to do extend. If we have multiple classes need to do extend, sperate them by comma.
ex. wt.generation.overrideNonExtendableClasses=wt.templateutil.processor.DefaultTemplateProcessor,wt.templateutil.processor.FormTaskDelegate
After you add them to user.properties, you can see this kind of warning message, it means you had successfully finished system generation.
Warning: wt.templateutil.processor.DefaultTemplateProcessor is not Extendable, but is being allowed as a backward compatible override