I'm trying to create a table and insert some data into it using Java 8, HSQLDB 2.4.0 working through Eclipse Neon.
I keep getting the following error:

"integrity constraint violation: NOT NULL check constraint; SYS_PK_10091 table: TRANSACTIONS column: ID"

Here's my code:

CREATE TABLE IF NOT EXISTS TRANSACTIONS ( tabKey IDENTITY PRIMARY KEY, "
+ "transaction_location varchar(20) NOT NULL, "
              + "account_number varchar(40) NOT NULL, "
              + "transaction_type varchar(20) NOT NULL, "
              + "account_balance varchar(20) NOT NULL, "
              + "transaction_amount varchar(20) NOT NULL, "
              + "out_of_network_charge varchar(5) NOT NULL, "
              + "new_account_balance varchar(20) NOT NULL, "
              + "date_time_stamp varchar(40) NOT NULL, "
              + "ip_address varchar(20) NOT NULL, "

              + "port_number varchar(20) NOT NULL )"

Here's my insert code:

String insert_string = "INSERT INTO TRANSACTIONS (transaction_location, account_number, transaction_type, account_balance, transaction_amount, out_of_network_charge, new_account_balance, date_time_stamp, ip_address, port_number) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
        psInsert = conn.prepareStatement(insert_string);
       
        psInsert.setString(1, transaction.getTransLocation());
        psInsert.setString(2, transaction.getAccountNumber());
        psInsert.setString(3, transaction.getTransType());
        psInsert.setString(4, transaction.getAccountBalance());
        psInsert.setString(5, transaction.getTransAmount());
        psInsert.setString(6, transaction.getOutOfNetworkCharge());
        psInsert.setString(7, transaction.getNewBalance());
        psInsert.setString(8, transaction.getDateTime());
        psInsert.setString(9, transaction.getNodeIpAddress());
        psInsert.setString(10, transaction.getNodePortNumber());
        psInsert.executeUpdate();

        conn.commit();

Am I doing something wrong?