stringtemplate - StringTemplate4 if conditional with length -

i need generate following kinds of code stringtemplate4:

methodfoo0(connection conn); methodfoo1(connection conn, int arg1); methodfoo2(connection conn, int arg1, int arg2);   etc. 

the "connection conn" part present passing method name , rest of arguments st template. template looks follows:

<methodname>(connection conn, <args; separator=", ">); 

this works produces comma when there no arguments @ (except conn):

methodfoo0(connection conn,); 

to eliminate comma tried using if conditional , length st4 function couldn't work although tried various combos following:

<methodname>(connection conn <if (length(fieldsinfind) \> 0)>,<else><endif><fieldsinfind; separator=", ">) 

... , others failed parsing-related error (mismatched input).

in end, gave , resorted passing comma parameter template either "," or empty string "" based on pre-rendering logic.

you check presence of second parameter using <if (fieldsinfind)> , pass template if size greater 0.