Hi Hans-Uwe,

Thanks. Good idea, this is probably something we should improve in a future 3.x version.

Currently the models/ModelFolder and generates/generate/output tags are replaced. The current implementation will replace any java system property, in fact the app.home is added as system property by the launcher scripts. For adding your own, it is a bit complicated at the moment, but you could edit the scripts or set the JAVA_OPTS environment variable (see the scripts) for the process, e.g. on windows cmd before running the codegen.bat you could:

set JAVA_OPTS=-Dpropertyname=”value”

to set the ‘propertyname’ system property value as ‘value’.

If you are familiar with Maven, you could also try generating with the included maven plugin as then the configuration would be in the pom.xml and you could use maven property-replacement system for any parameter. The generate-once targets could be made to separate executions and toggled via maven profiles. If your project does not use maven, or you are not familiar with it, then this might be a bit overkill solution.