Write empty Jtable columns to disk

[ocean]

<SOLVED>

Evening all.

Have this small problem, if i happen to have an empty column when i save the data from JTable to disk, it erase all data stored in the file and cast a

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

I use Vectors with DefaultTableModel. Mabey I can solve it within the try and catch part? Or you guys have a better ide?

[dinosoep]

post a bit of your code?

[ocean]

This is the method for saving it to disk.

void writeProject(String fileName){

          //  Finish editing the current cell before saving
      if  (custTable.isEditing() ){
	   int row =custTable.getEditingRow();
	   int col =custTable.getEditingColumn();
           custTable.getCellEditor(row, col).stopCellEditing();
       }

        int rows = custTable.getRowCount();
	 int columns = custTable.getColumnCount();
      
       TableColumnModel header =custTable.getColumnModel();

try {
       FileWriter fw = new FileWriter("/home/magnus/NetBeansProjects/files/" + fileName +".cust");
       BufferedWriter out = new BufferedWriter (fw);

         //  Write out the Column Headers
	for (int k = 0; k < columns; k++){
	TableColumn column = header.getColumn(k);
	String value = (String)column.getHeaderValue();
        out.write(value);
        out.write("|");
	} out.newLine();

         //  Write out the table rows
	for (int j = 0; j < rows; j++){
		for (int k = 0; k < columns; k++){
		String value = (String)custTable.getValueAt(j, k);
                out.write(value);
                out.write("|");
		}
                out.newLine();
		}
                out.close();
 }catch(IOException ee) {
             throw new RuntimeException(ee);
        }
} // END WriteProject/

[dinosoep]

the line befor out.close(); write out.flush();
does it saves now?

[dinosoep]

and by the way, does it saves sometimes?
or does it always give a nullpointer exception?

[ocean]

It saves fine if there is a value in every column.

[ocean]

Think i migth get it solved. Trying something like

if (value == null){
          code
 }

Just gonna come up something good for the code part.

[dinosoep]

what's in your file when you save it if not every collumn has a value?

[ocean]

If i save with a collumn = null it erase all data stored in the file.

Not sure yet how Im gonna handle this. Do I want the user to be able to save null columns or should i make sure he/she fills them. Makes more sence to allow user to save empty data i guess.

[ocean]

Hm. Very Strange.. I had to do

from

out.write(value);
out.write("|");

to

out.write(value +"|");

It writes the word NULL for every empty column. and are not deleting file contens. Great. :)