NullPointerException on INSERT

[Bob Backlund]

Hi I'm pretty new to the whole SQL/Java thing, I'm trying to right a simple JSP/Servlet site. (well I thought it'd be simple)
Simply the user can enter some data into a set of fields on a JSP, this is then passed through a Sevler to another JSP. The Servlet is getting the data from the fields (I have System.out to show the data values) but the insert is failing with a java.lang.NullPointerException expection, even though all fields have a value in them and could accept a NULL value anyway.
The only thing I can think of, is i have a 'ID' field which is currently being left blank, however like i said it can have a NULL value so I don't think this should be a problem.
KPS

[Nagendra Prasad]

Are you sure it is the insert that is throwing the NullPointerException? Are you sure it is not somewhere else in the code?
Best would be to inspect the stack trace? or post it here... I can take a look and offer my 2 pence worth of advice.

[Jeanne Boyarsky]

Are you by any chance trying to do this?

insert into table (id) values ('null')

This is a commonly used invalid way of inserting null.