string - im getting following exception when doing following code: java.lang.StringIndexOutOfBoundsException -

//for loop traversing rows (int = 1 ; < roorws.getcount() ; i++)         {   // loop traversing columns             (int j = 1 ;j<tcols ; j++)              {  //if column 5                 if(j==5)                   //printing values of cell 5                    system.out.print(cells.get(i,j).getvalue().tostring().substring(0, 26).length()+ "\t");                  string cell1=cells.get(i,j).getvalue().tostring().substring(0, 26);                   cell=cells.get("f2");                  cell.putvalue(cell1);              }         system.out.println("");         } 

apparently length of string not (at least) 26 characters. change:

system.out.print(cells.get(i,j).getvalue().tostring().substring(0, 26).length()+ "\t"); 

to:

system.out.print(cells.get(i,j).getvalue().tostring().length()+ "\t"); 

to print length of string.

you can use apache commons stringutils substring() method sub string in safe way (so takes @ n characters):

string cell1= stringutils.substring(cells.get(i,j).getvalue().tostring(), 0, 26);