How do I create an empty data directory with install4j?

Question

I used the "Directory selection" screen template to let the user choose a data directory.

I then used the variable from that location to define a distribution tree root:

The data dir does not get created. Do I need at least one dummy file inside the root?

user_936832 · Answer

Installation roots are not created if they do no exist and no files are contained in them. You can add a "Run script" action and set the script to

new File((String)context.getVariable("InstallationDataPath")).mkdirs();
return true;