Write empty Jtable columns to disk

<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

Code:

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

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

post a bit of your code?

This is the method for saving it to disk.

Code:

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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/

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

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

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

Think i migth get it solved. Trying something like

Code:

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if (value == null){
          code
 }

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Just gonna come up something good for the code part.

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

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.

Hm. Very Strange.. I had to do

from

Code:

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

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to

Code:

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out.write(value +"|");

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