Unable to reference local variable with JsonBuilder

I have the following code

    AddTicketCommand addTicketCommand = new AddTicketCommand(request.JSON)    JsonBuilder jsonBuilder = new JsonBuilder()    jsonBuilder {        ticket {            subject addTicketCommand.subject            requester {                name currentUser?.name                email currentUser?.emailAddress            }            comment {                body addTicketCommand.comment            }            custom_fields {                [                        {                            id 21857727                            value addTicketCommand.zenRequestType                        },                        {                            id 21854146                            value addTicketCommand.zenProductId                        }                ]            }        }    }

The addTicketCommand object is not null on line 2 yet is undefined within the JsonBuilder closure. Is it not possible to access local variables in groovy from within closure?

You should be able to access addTicketCommand inside the closure as below. Mark the use of “parenthesis” instead of “curly” braces.

AddTicketCommand addTicketCommand = new AddTicketCommand(request.JSON)JsonBuilder jsonBuilder = new JsonBuilder()    jsonBuilder {        ticket {            subject addTicketCommand.subject            requester {                name currentUser?.name                email currentUser?.emailAddress            }            comment {                body addTicketCommand.comment            }            custom_fields ([ //Note the use of parenthesis                {                    id 21857727                    value addTicketCommand.zenRequestType                },                {                    id 21854146                    value addTicketCommand.zenProductId                }            ]) ////Note the use of parenthesis        }    }