how can i style and merge cells without affects other sheets in spreadsheet
spreadsheet sheet=new spreadsheet();
CellRangeAddress s=new CellRangeAddress(start_row,start_row ,start_col ,end_col);
sheet.getActiveSheet().addMergedRegion(s);
sheet.createnewsheet(“name”,100,10);
CellRangeAddress s=new CellRangeAddress(start_row,start_row ,start_col ,end_col);
sheet.getActiveSheet().addMergedRegion(s);
both mergedregion comes in same range but sheets are different
when am run this code it throws llegal state exception or null pointer exception