HELP! insert record

I'm doing a program by using Java to insert record into SQL file. it's a registration program. but i'm not familiar with SQL, i got an error msg "An attempt was made to insert a null value into a column that does not accept nulls. " and i cant solve it. my SQL file contains

connect 'jdbc:rmi://localhost:1099/jdbc:cloudscape:customers;create=true'
;

drop table custProducts
;
drop table products
;
drop table custinfor
;

create table custinfor (
userName varchar (20) NOT NULL,
firstName varchar (20) NOT NULL,
lastName varchar (30) NOT NULL,
email varchar (30) NOT NULL,
password varchar (20) NOT NULL,
verify varchar (20) NOT NULL,
constraint pk_custinfor primary key (userName)
)
;
create table products (
productID int DEFAULT AUTOINCREMENT,
productName varchar (100) NOT NULL,
description varchar (100) NOT NULL,
price real NOT NULL,
imageFile varchar (50) NOT NULL,
constraint pk_products primary key (productID)
)
;
create table custProducts (
userName varchar (20) NOT NULL,
productID int NOT NULL,
constraint fk_custProducts_1 foreign key (userName)
references custinfor (userName),
constraint fk_custProducts_2 foreign key (productID)
references products (productID)
)
;
insert into custinfor (userName,firstName,lastName,email,password,verify ) values ('jSmith','John','Smith','sjohn@.hotmail.com','jsmi th123','jsmith123')
;
insert into custinfor (userName,firstName,lastName,email,password,verify ) values ('jess88','Jess','Ling','jess88@.yahoo.com','jess45 6','jess456')
;

insert into products (productName,description,price,imageFile) values ('Desktop-1','Intel Pentium 4 Processor 1.8Gb,256MB RAM',2998.00,'pentium4 processor.jpg')
;
insert into products (productName,description,price,imageFile) values ('Desktop-2','Intel Celeron Processor,256MB RAM',2260.00,'pentium4 processor.jpg')
;

insert into custProducts (userName,productID) values ('jSmith',1)
;
insert into custProducts (userName,productID) values ('jess88',2)
;

can someone tell me what's the mistake that i made?Hi:

Look... your problem is easy.
Please, try to execute one insert at the time and then you can figure which sentence has the problem.
One of them is tryng to insert a null value in a null column.|||At first glance, everything in your SQL looks good. I notice that you probably should handle the users' password verification in the UI instead of the DB, but that's a minor nit-pick.

Which statement gives you the error?|||thanks moku and avarta. i cancelled the some of the NOT NULL and it works. thanks.