I have this variable called ListItems in Camunda 7.16 on Java 14. The variable Type based on the Variables tab is an Object and its value says java.util.ArrayList. I’m stumped as I tried to get the item count in ListItems as a parameter in http-connector payload with Assignment type of String or expression.

{
     "ProcessNo": "${execution.processBusinessKey}",
     "TotalItem": "${S(ListItems).length}"
}

I have tried the following: ${S(ListItems).length}, ${S(ListItems).length()}, ${S(ListItems).size()}, ${(ListItems).size()}, and a the following Script Task (in Inline Javascript)

execution.getVariable("ListItem").size();

I’m running out of idea what to try next.