I am a rookie java servlet programmer, and I am getting an error that is confusing me.
I have created an HTML form that has a large number of check boxes. The idea being that each checkbox represents a column in a database. I hope to structure an sql call that will include only the checked columns. The odd thing about the program is that it works fine if I check every box. If I leave any unchecked I get a null pointer exception at the point in the code where I am checking to see if the box is checked.
This is an example of my html input statement:
input type=checkbox name=cpumod value="yes" CPU Model
This is an example of my servlet code that checks:
String b = req.getParameter("cpumod");
if (b.equals("yes") == true)
sqlcom2 += ",\n CPUMOD";
This is the exception I see in my logs:
Instantiate: DBgetsysid
Sep 24, 2001 17:57:08.357 PM 12d7140000000019:Thread-13:130899e0 StrictServlet X doService
java.lang.NullPointerException
.at DBgetsysid.doPost(DBgetsysid.java:68)
BTW I am using doPost to process the form. Can anyone help me with my mistake? I just can't see it.
TIA,
brad
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