null pointer in createCell()

• To: visad-list@xxxxxxxxxxxxx
• Subject: null pointer in createCell()
• From: "Kam, Michelle C" <michelle.c.kam@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,
Michelle

Michelle Kam           (408) 742-2881
Lockheed Martin Space Systems Co. SSM/ATC/MSIS
B/153 O/L922 
1111 Lockheed Martin Way, Sunnyvale, CA 94089

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