null pointer in createCell()

• To: visad-list@xxxxxxxxxxxxx
• Subject: null pointer in createCell()
• From: "User" <xxxxxx@xxxxxxxx>
• Date: Thu, 31 Jul 2003 11:48:04 -0700

Hi,

In SpreadSheet.java, I have a null pointer exception in 
constructSpreadsheetCells(String[][] l, RemoteServer rs) specifically at 
f.addSSCellListener(this); because     the line before which is f = 
createCell(l[i][j], rs); causes f to be null. And createCell() returns null if 
the following is true (!(cell instanceof FancySSCell)) {. Does anyone know 
when/why the cellConstructor.newInstance(args); would create a null instance? 

My program was running just fine until I added one line of code to my own 
method in SpreadSheet.java and now I get this null pointer about 1/15 or 1/20 
times I run it. I'm pretty sure the bug is not coming from my code because when 
the spreadsheet is just loading up, my code has not yet been read.

Thanks,

• Follow-Ups:
  • Re: null pointer in createCell()
    • From: Curtis Rueden