What is the correct way to load an image into a BLOB field?

Question

Oracle

Greetings dear people working to change the world. I have a question for you again. Stuck on loading image in BLOB field, in oracle sql table, how to do it right? At the moment the situation is as follows:

Created a BLOB field in an oracle sql table to write images from the site into it.

The HTML code that is sent to the servlet is:
th Your photo /th
form action = "images" method= "post" enctype="multipart/form-data"
input type= "file" name="images" /
input type= "text" name="user_id"/
input type="submit" value ="Upload"
/form
tr/

JAVA code on the servlet that receives the request and sends it to the server:
try{
String sql= "update tbl_customer set images1='"+request.getParameter("images").toString()+"' where user_id='"+request.getParameter("user_id").toString()+"' ";
OraclePreparedStatement pst=(OraclePreparedStatement)conn.prepareStatement(sql);
OracleResultSet rs = (OracleResultSet) pst.executeQuery();
pst.execute();
response.sendRedirect(response.encodeRedirectURL("PersonalSave.jsp"));
if(rs.next()){

HttpSession session = request.getSession();
session.setAttribute("user_id", rs.getString("user_id"));}
}catch(Exception e){
out.println(e);
e.printStackTrace();}}}} Resulting in an

error:
java.lang.NullPointerException

Thanks in advance for your feedback.
Sincerely, M.M.

Answer 1

NullPointerException on which line?