swing - Java- add an editable row to a JTable -

i have java gui displays jtable , button. when button clicked, want add new editable row of cells table. trying using following actionlistener(), have assigned button:

addbtn.addactionlistener(new actionlistener(){     public void actionperformed(actionevent e){         system.out.println("'add' button pressed. ");         defaulttablemodel model = (defaulttablemodel)jentityfiltertable.getmodel();         model.addrow(new object[]{"site", "application", "entity"});         system.out.println("--- actionlistener added 'addbtn' ---");     } }); 

in console, when click button, see message stating "'add' button pressed. "... however, exception says:

exception in thread "awt-eventqueue-0" java.lang.arrayindexoutofboundsexception: 0 >= 0

i assume occurring on model.addrow... line, since place i've used array, i'm not sure why i'm getting error- i'm creating empty object array, , not defining size, surely shouldn't have problem index no matter how many elements add it- it's array dynamic size.

can point out i'm going wrong here?

edit 27/06/2014 @ 09:50

i've tried changing method slightly, have following code:

addbtn.addactionlistener(new actionlistener(){     public void actionperformed(actionevent e){         system.out.println("'add' button pressed. ");         defaulttablemodel model = (defaulttablemodel)jentityfiltertable.getmodel();          vector<string> row = new vector<string>();         row.add("site");         row.add("application");         row.add("entity");          system.out.println("row count: " + model.getrowcount());         system.out.println("1st column: " + model.getcolumnname(0));         system.out.println("column count: " + model.getcolumncount());          model.addrow(row);          system.out.println("--- actionlistener added 'addbtn' ---");     } }); 

when run application, , click button i've added actionlistener(), see following output in console:

'add' button pressed.

row count: 0

1st column: site

column count: 3

exception in thread "awt-eventqueue-0" java.lang.arrayindexoutofboundsexception: 0 >= 0

it appear exception occurring on line:

model.addrow(row); 

i can't work out why i'm getting exception on line- looks correct me... have ideas?