groovy - Trying to setCellValue on blank cell -

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i trying insert text blank cell 

getrow( 0 ).getcell( 0 ).setcellvalue( 'hat selection' )

and keep getting

cannot invoke method setcellvalue() on null object

why can't insert text blank cell? how can i?

in case of object null, should first create , should set value on that. use createrow if have not created row already.

sheet.createrow(0);

if have created row, not respective cell first create respective cell , put desired value. use

sheet.getrow(0).createcell(0).setcellvalue(value);

or can combine all

sheet.createrow(0).createcell(0).setcellvalue(value);

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