How to create an arraylist like attribute

General Questions/Discussions
1

I need to add one arraylist like Attribute but in return I cant find that odd. How I can add the arralist atribute

2

Dear user,

Please name the attribute “attr : ArrayList” where attr is the attribute name and ArrayList is the type of attribute. If you want to generate code from your model, please name it java.util.ArrayList instead of ArrayList.

Best regards,
Jick Yeung