the @Datamodel selectitems is initialized by the ExpressCalculator 's method
"calculateInstallationCosts()". it executes a private method which returns the
Set. I just did not write it down here. selectitems is properly initialized
because i can e.g display the size of it by writing a method in BudgetOverview
public int getSize() {
| return selectitems.size();
| }
and display it like
<h:outputText value"#{budgetOverview.size}"/>
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